CVE-2026-27191

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-27191", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-02-18T19:47:02.154Z", "datePublished": "2026-02-21T03:23:28.340Z", "dateUpdated": "2026-02-25T21:24:54.980Z"}, "containers": {"cna": {"title": "Feathers: Open Redirect in OAuth callback enables account takeover", "problemTypes": [{"descriptions": [{"cweId": "CWE-601", "lang": "en", "description": "CWE-601: URL Redirection to Untrusted Site ('Open Redirect')", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "ACTIVE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 7.4, "baseSeverity": "HIGH", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N", "version": "4.0"}}], "references": [{"name": "https://github.com/feathersjs/feathers/security/advisories/GHSA-ppf9-4ffw-hh4p", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/feathersjs/feathers/security/advisories/GHSA-ppf9-4ffw-hh4p"}, {"name": "https://github.com/feathersjs/feathers/commit/ee19a0ae9bc2ebf23b1fe598a1f7361981b65401", "tags": ["x_refsource_MISC"], "url": "https://github.com/feathersjs/feathers/commit/ee19a0ae9bc2ebf23b1fe598a1f7361981b65401"}, {"name": "https://github.com/feathersjs/feathers/releases/tag/v5.0.40", "tags": ["x_refsource_MISC"], "url": "https://github.com/feathersjs/feathers/releases/tag/v5.0.40"}], "affected": [{"vendor": "feathersjs", "product": "feathers", "versions": [{"version": "< 5.0.40", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-02-21T03:23:28.340Z"}, "descriptions": [{"lang": "en", "value": "Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. Versions 5.0.39 and below the redirect query parameter is appended to the base origin without validation, allowing attackers to steal access tokens via URL authority injection. This leads to full account takeover, as the attacker obtains the victim's access token and can impersonate them. The application constructs the final redirect URL by concatenating the base origin with the user-supplied redirect parameter. This is exploitable when the origins array is configured and origin values do not end with /. An attacker can supply @attacker.com as the redirect value results in https://target.com@attacker.com#access_token=..., where the browser interprets attacker.com as the host, leading to full account takeover. This issue has been fixed in version 5.0.40."}], "source": {"advisory": "GHSA-ppf9-4ffw-hh4p", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-02-25T21:24:47.074922Z", "id": "CVE-2026-27191", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-02-25T21:24:54.980Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-27191", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-02-25T21:24:47.074922Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-02-25T21:24:51.611Z"}}], "cna": {"title": "Feathers: Open Redirect in OAuth callback enables account takeover", "source": {"advisory": "GHSA-ppf9-4ffw-hh4p", "discovery": "UNKNOWN"}, "metrics": [{"cvssV4_0": {"version": "4.0", "baseScore": 7.4, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N", "userInteraction": "ACTIVE", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "HIGH"}}], "affected": [{"vendor": "feathersjs", "product": "feathers", "versions": [{"status": "affected", "version": "< 5.0.40"}]}], "references": [{"url": "https://github.com/feathersjs/feathers/security/advisories/GHSA-ppf9-4ffw-hh4p", "name": "https://github.com/feathersjs/feathers/security/advisories/GHSA-ppf9-4ffw-hh4p", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/feathersjs/feathers/commit/ee19a0ae9bc2ebf23b1fe598a1f7361981b65401", "name": "https://github.com/feathersjs/feathers/commit/ee19a0ae9bc2ebf23b1fe598a1f7361981b65401", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/feathersjs/feathers/releases/tag/v5.0.40", "name": "https://github.com/feathersjs/feathers/releases/tag/v5.0.40", "tags": ["x_refsource_MISC"]}], "descriptions": [{"lang": "en", "value": "Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. Versions 5.0.39 and below the redirect query parameter is appended to the base origin without validation, allowing attackers to steal access tokens via URL authority injection. This leads to full account takeover, as the attacker obtains the victim's access token and can impersonate them. The application constructs the final redirect URL by concatenating the base origin with the user-supplied redirect parameter. This is exploitable when the origins array is configured and origin values do not end with /. An attacker can supply @attacker.com as the redirect value results in https://target.com@attacker.com#access_token=..., where the browser interprets attacker.com as the host, leading to full account takeover. This issue has been fixed in version 5.0.40."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-601", "description": "CWE-601: URL Redirection to Untrusted Site ('Open Redirect')"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-02-21T03:23:28.340Z"}}}, "cveMetadata": {"cveId": "CVE-2026-27191", "state": "PUBLISHED", "dateUpdated": "2026-02-25T21:24:54.980Z", "dateReserved": "2026-02-18T19:47:02.154Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2026-02-21T03:23:28.340Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"product": "feathers", "vendor": "feathersjs", "versions": [{"status": "affected", "version": "< 5.0.40"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:feathersjs:feathers:*:*:*:*:*:node.js:*:*", "matchCriteriaId": "5396E6E0-0D34-409C-A8A6-57AF06A90FEE", "versionEndExcluding": "5.0.40", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. Versions 5.0.39 and below the redirect query parameter is appended to the base origin without validation, allowing attackers to steal access tokens via URL authority injection. This leads to full account takeover, as the attacker obtains the victim's access token and can impersonate them. The application constructs the final redirect URL by concatenating the base origin with the user-supplied redirect parameter. This is exploitable when the origins array is configured and origin values do not end with /. An attacker can supply @attacker.com as the redirect value results in https://target.com@attacker.com#access_token=..., where the browser interprets attacker.com as the host, leading to full account takeover. This issue has been fixed in version 5.0.40."}, {"lang": "es", "value": "Feathersjs es un framework para crear APIs web y aplicaciones en tiempo real con TypeScript o JavaScript. En las versiones 5.0.39 e inferiores, el par\u00e1metro de consulta redirect se a\u00f1ade al origen base sin validaci\u00f3n, permitiendo a los atacantes robar tokens de acceso mediante inyecci\u00f3n de autoridad de URL. Esto lleva a una toma de control total de la cuenta, ya que el atacante obtiene el token de acceso de la v\u00edctima y puede suplantarla. La aplicaci\u00f3n construye la URL de redirecci\u00f3n final concatenando el origen base con el par\u00e1metro redirect proporcionado por el usuario. Esto es explotable cuando el array de or\u00edgenes est\u00e1 configurado y los valores de origen no terminan con /. Un atacante puede proporcionar @attacker.com como valor de redirecci\u00f3n, lo que resulta en https://target.com@attacker.com#access_token=..., donde el navegador interpreta attacker.com como el host, lo que lleva a una toma de control total de la cuenta. Este problema ha sido solucionado en la versi\u00f3n 5.0.40."}], "id": "CVE-2026-27191", "lastModified": "2026-06-17T10:26:49.270", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 2.7, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "ACTIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-27191", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-02-25T21:24:47.074922Z", "version": "2.0.3"}}]}, "published": "2026-02-21T04:15:58.493", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/feathersjs/feathers/commit/ee19a0ae9bc2ebf23b1fe598a1f7361981b65401"}, {"source": "security-advisories@github.com", "tags": ["Product", "Release Notes"], "url": "https://github.com/feathersjs/feathers/releases/tag/v5.0.40"}, {"source": "security-advisories@github.com", "tags": ["Third Party Advisory"], "url": "https://github.com/feathersjs/feathers/security/advisories/GHSA-ppf9-4ffw-hh4p"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-601"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,5.0.40)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "feathers", "source": "cna", "vendor": "feathersjs"}, "product": "feathers", "vendor": "feathersjs"}], "analysis": {"en": {"generated_at": "2026-04-18T11:21:31.648943+00:00", "value": {"mitigation_remediation": ["Update FeathersJS to version 5.0.40 or later, which removes the redirect concatenation flaw.", "Ensure that all entries in the OAuth origins array end with a trailing slash to prevent unintended URL construction.", "Audit existing OAuth tokens and revoke any that may have been compromised, and implement monitoring for suspicious login activity."], "summary": {"action": "Immediate Patch", "impact": "Account Takeover via OAuth redirect"}, "threat_synthesis": {"affected_systems": "Applications built with FeathersJS version 5.0.39 or earlier are affected. The bug appears when the \"origins\" array in the Feathers configuration is used and the origin values lack a trailing slash, allowing the redirect concatenation to form a URL with the attacker\u2019s host. The fix is included in version 5.0.40.", "description_and_impact": "A flaw in FeathersJS allows an attacker to manipulate the OAuth callback redirect URL, causing the application to construct a redirect that injects a malicious host. By including a value such as @attacker.com in the redirect parameter, the browser interprets the request as going to attacker.com while preserving the access token in the fragment. The attacker can then capture the victim\u2019s access token, which enables full impersonation of the user. The weakness is identified as CWE\u2011601 \u2013 Open Redirect.", "risk_and_exploitability": "The vulnerability carries a CVSS score of 7.4, indicating high potential for exploitation. The EPSS score is below 1%, suggesting low current exploitation probability, and the issue is not listed in the CISA KEV catalog. The attack vector is likely an unauthenticated request to an OAuth endpoint that accepts an attacker\u2011controlled redirect parameter. Users may be tricked into visiting a crafted link, enabling the attacker to steal tokens and gain full account access. No public exploits are known, but the combination of a high CVSS score and the nature of OAuth makes this a priority for remediation."}}}}, "created": "2026-02-23T14:32:53.750502+00:00", "updated": "2026-04-18T11:30:44.313165+00:00", "vendors": ["feathersjs", "feathersjs$PRODUCT$feathers"]}