CVE-2026-35390

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{"affected": [{"affectedData": [{"product": "webmail", "vendor": "bulwarkmail", "versions": [{"status": "affected", "version": "< 1.4.11"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:bulwarkmail:webmail:*:*:*:*:*:*:*:*", "matchCriteriaId": "1011888E-0A3E-46C3-9234-45C7E75C0A31", "versionEndExcluding": "1.4.11", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Bulwark Webmail is a self-hosted webmail client for Stalwart Mail Server. Prior to 1.4.11, the reverse proxy (proxy.ts) set the Content-Security-Policy-Report-Only header instead of the enforcing Content-Security-Policy header. This means cross-site scripting (XSS) attacks were logged but not blocked. Any user who could inject script content (e.g., via crafted email HTML) could execute arbitrary JavaScript in the context of the application, potentially stealing session tokens or performing actions on behalf of the user. This vulnerability is fixed in 1.4.11."}, {"lang": "es", "value": "Bulwark Webmail es un cliente de webmail autoalojado para Stalwart Mail Server. Antes de la versi\u00f3n 1.4.11, el proxy inverso (proxy.ts) configuraba el encabezado Content-Security-Policy-Report-Only en lugar del encabezado Content-Security-Policy que aplica las pol\u00edticas. Esto significa que los ataques de cross-site scripting (XSS) se registraban pero no se bloqueaban. Cualquier usuario que pudiera inyectar contenido de script (por ejemplo, a trav\u00e9s de HTML de correo electr\u00f3nico manipulado) podr\u00eda ejecutar JavaScript arbitrario en el contexto de la aplicaci\u00f3n, potencialmente robando tokens de sesi\u00f3n o realizando acciones en nombre del usuario. Esta vulnerabilidad est\u00e1 corregida en la versi\u00f3n 1.4.11."}], "id": "CVE-2026-35390", "lastModified": "2026-07-24T21:10:00.143", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.3, "impactScore": 2.7, "source": "nvd@nist.gov", "type": "Primary"}, {"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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 5.3, "baseSeverity": "MEDIUM", "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": "LOW", "subIntegrityImpact": "LOW", "userInteraction": "PASSIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/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": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-35390", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-04-07T19:32:36.189323Z", "version": "2.0.3"}}]}, "published": "2026-04-06T21:16:20.723", "references": [{"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/bulwarkmail/webmail/security/advisories/GHSA-6q52-98cr-qx65"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.4.11)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "webmail", "source": "cna", "vendor": "bulwarkmail"}, "product": "webmail", "vendor": "bulwarkmail"}], "analysis": {"en": {"generated_at": "2026-04-09T22:57:55.513368+00:00", "value": {"mitigation_remediation": ["Upgrade Bulwark Webmail to version 1.4.11 or later."], "summary": {"action": "Patch", "impact": "Cross\u2011Site Scripting (XSS) enabling session hijacking"}, "threat_synthesis": {"affected_systems": "The flaw exists in Bulwark Mail\u2019s self\u2011hosted webmail client for the Stalwart Mail Server. Versions prior to 1.4.11 are affected, including 1.4.10 and earlier. Administrators managing the webmail instance must review installed versions and apply the fix when available.", "description_and_impact": "The vulnerable Bulwark Webmail component configured a Content\u2011Security\u2011Policy\u2011Report\u2011Only header instead of an enforcing Policy. This oversight allowed cross\u2011site scripting (XSS) payloads supplied through HTML emails to execute unchallenged in the user\u2019s browser. The attacker could run arbitrary JavaScript in the application context, potentially stealing session cookies or performing actions on behalf of the user. This is a classic reflected or stored XSS flaw (CWE\u201179).", "risk_and_exploitability": "The CVSS score is 5.3, indicating moderate severity, while the EPSS score is less than 1%, suggesting a low likelihood of exploitation. The vulnerability is not listed in the CISA KEV catalog. An attacker would need to embed malicious scripts into an email that a user opens or views, so the attack vector is client\u2011side web interface access. Although the risk is moderate, the potential for session hijacking and unauthorized actions warrants timely remediation."}}}}, "created": "2026-04-07T06:54:13.780664+00:00", "updated": "2026-04-10T09:45:06.948719+00:00", "vendors": ["bulwarkmail", "bulwarkmail$PRODUCT$webmail"]}