CVE-2026-55430

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-55430", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-06-16T21:59:57.017Z", "datePublished": "2026-07-08T00:03:29.728Z", "dateUpdated": "2026-07-08T17:10:40.949Z"}, "containers": {"cna": {"title": "Coder's subdomain workspace app routing trusts unauthenticated X-Forwarded-Host header, enabling cross-app data access", "problemTypes": [{"descriptions": [{"cweId": "CWE-345", "lang": "en", "description": "CWE-345: Insufficient Verification of Data Authenticity", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-441", "lang": "en", "description": "CWE-441: Unintended Proxy or Intermediary ('Confused Deputy')", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:N/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/coder/coder/security/advisories/GHSA-5g4w-3vw9-478w", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/coder/coder/security/advisories/GHSA-5g4w-3vw9-478w"}, {"name": "https://github.com/coder/coder/pull/26204", "tags": ["x_refsource_MISC"], "url": "https://github.com/coder/coder/pull/26204"}, {"name": "https://github.com/coder/coder/releases/tag/v2.29.17", "tags": ["x_refsource_MISC"], "url": "https://github.com/coder/coder/releases/tag/v2.29.17"}, {"name": "https://github.com/coder/coder/releases/tag/v2.32.7", "tags": ["x_refsource_MISC"], "url": "https://github.com/coder/coder/releases/tag/v2.32.7"}, {"name": "https://github.com/coder/coder/releases/tag/v2.33.8", "tags": ["x_refsource_MISC"], "url": "https://github.com/coder/coder/releases/tag/v2.33.8"}, {"name": "https://github.com/coder/coder/releases/tag/v2.34.2", "tags": ["x_refsource_MISC"], "url": "https://github.com/coder/coder/releases/tag/v2.34.2"}], "affected": [{"vendor": "coder", "product": "coder", "versions": [{"version": ">= 2.34.0, < 2.34.2", "status": "affected"}, {"version": ">= 2.33.0, < 2.33.8", "status": "affected"}, {"version": ">= 2.30.0, < 2.32.7", "status": "affected"}, {"version": "< 2.29.17", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-07-08T00:03:29.728Z"}, "descriptions": [{"lang": "en", "value": "Coder allows organizations to provision remote development environments via Terraform. Prior to versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2, the workspace app proxy resolves the target app from `httpapi.RequestHost()` which prefers the `X-Forwarded-Host` header over the real `Host` header. No middleware strips `X-Forwarded-Host` before routing and the header is not browser-forbidden so client-side JavaScript can set it on `fetch()` calls. Practical exploitation requires subdomain app routing (wildcard hostname) enabled, a victim who visits the attacker's shared app and a deployment whose upstream proxy does not strip `X-Forwarded-Host`. The fix in versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2 trusts `X-Forwarded-Host` only from configured trusted proxies and otherwise resolves the routing host from the verified request host. As a workaround, place an upstream reverse proxy that strips or overwrites `X-Forwarded-Host` on untrusted requests."}], "source": {"advisory": "GHSA-5g4w-3vw9-478w", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-07-08T16:57:10.249359Z", "id": "CVE-2026-55430", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-08T17:10:40.949Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-55430", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-08T16:57:10.249359Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-08T16:57:13.571Z"}}], "cna": {"title": "Coder's subdomain workspace app routing trusts unauthenticated X-Forwarded-Host header, enabling cross-app data access", "source": {"advisory": "GHSA-5g4w-3vw9-478w", "discovery": "UNKNOWN"}, "metrics": [{"cvssV3_1": {"scope": "CHANGED", "version": "3.1", "baseScore": 5.8, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "REQUIRED", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}}], "affected": [{"vendor": "coder", "product": "coder", "versions": [{"status": "affected", "version": ">= 2.34.0, < 2.34.2"}, {"status": "affected", "version": ">= 2.33.0, < 2.33.8"}, {"status": "affected", "version": ">= 2.30.0, < 2.32.7"}, {"status": "affected", "version": "< 2.29.17"}]}], "references": [{"url": "https://github.com/coder/coder/security/advisories/GHSA-5g4w-3vw9-478w", "name": "https://github.com/coder/coder/security/advisories/GHSA-5g4w-3vw9-478w", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/coder/coder/pull/26204", "name": "https://github.com/coder/coder/pull/26204", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/coder/coder/releases/tag/v2.29.17", "name": "https://github.com/coder/coder/releases/tag/v2.29.17", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/coder/coder/releases/tag/v2.32.7", "name": "https://github.com/coder/coder/releases/tag/v2.32.7", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/coder/coder/releases/tag/v2.33.8", "name": "https://github.com/coder/coder/releases/tag/v2.33.8", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/coder/coder/releases/tag/v2.34.2", "name": "https://github.com/coder/coder/releases/tag/v2.34.2", "tags": ["x_refsource_MISC"]}], "descriptions": [{"lang": "en", "value": "Coder allows organizations to provision remote development environments via Terraform. Prior to versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2, the workspace app proxy resolves the target app from `httpapi.RequestHost()` which prefers the `X-Forwarded-Host` header over the real `Host` header. No middleware strips `X-Forwarded-Host` before routing and the header is not browser-forbidden so client-side JavaScript can set it on `fetch()` calls. Practical exploitation requires subdomain app routing (wildcard hostname) enabled, a victim who visits the attacker's shared app and a deployment whose upstream proxy does not strip `X-Forwarded-Host`. The fix in versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2 trusts `X-Forwarded-Host` only from configured trusted proxies and otherwise resolves the routing host from the verified request host. As a workaround, place an upstream reverse proxy that strips or overwrites `X-Forwarded-Host` on untrusted requests."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-345", "description": "CWE-345: Insufficient Verification of Data Authenticity"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-441", "description": "CWE-441: Unintended Proxy or Intermediary ('Confused Deputy')"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-07-08T00:03:29.728Z"}}}, "cveMetadata": {"cveId": "CVE-2026-55430", "state": "PUBLISHED", "dateUpdated": "2026-07-08T17:10:40.949Z", "dateReserved": "2026-06-16T21:59:57.017Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2026-07-08T00:03:29.728Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"product": "coder", "vendor": "coder", "versions": [{"status": "affected", "version": ">= 2.34.0, < 2.34.2"}, {"status": "affected", "version": ">= 2.33.0, < 2.33.8"}, {"status": "affected", "version": ">= 2.30.0, < 2.32.7"}, {"status": "affected", "version": "< 2.29.17"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:coder:coder:*:*:*:*:*:go:*:*", "matchCriteriaId": "F97FAF48-192E-4814-82A5-085C44F1D261", "versionEndExcluding": "2.29.17", "vulnerable": true}, {"criteria": "cpe:2.3:a:coder:coder:*:*:*:*:*:go:*:*", "matchCriteriaId": "7ABD4A9B-6AE8-47D8-A1B7-91E42EE0481B", "versionEndExcluding": "2.32.7", "versionStartIncluding": "2.30.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:coder:coder:*:*:*:*:*:go:*:*", "matchCriteriaId": "F759EEF3-6EAE-475B-85F8-38E7D7B47438", "versionEndExcluding": "2.33.8", "versionStartIncluding": "2.33.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:coder:coder:*:*:*:*:*:go:*:*", "matchCriteriaId": "397A02BF-6CF6-40B1-B792-D7CB9D229050", "versionEndExcluding": "2.34.2", "versionStartIncluding": "2.34.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Coder allows organizations to provision remote development environments via Terraform. Prior to versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2, the workspace app proxy resolves the target app from `httpapi.RequestHost()` which prefers the `X-Forwarded-Host` header over the real `Host` header. No middleware strips `X-Forwarded-Host` before routing and the header is not browser-forbidden so client-side JavaScript can set it on `fetch()` calls. Practical exploitation requires subdomain app routing (wildcard hostname) enabled, a victim who visits the attacker's shared app and a deployment whose upstream proxy does not strip `X-Forwarded-Host`. The fix in versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2 trusts `X-Forwarded-Host` only from configured trusted proxies and otherwise resolves the routing host from the verified request host. As a workaround, place an upstream reverse proxy that strips or overwrites `X-Forwarded-Host` on untrusted requests."}], "id": "CVE-2026-55430", "lastModified": "2026-07-08T19:43:14.500", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 1.3, "impactScore": 4.0, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.3, "impactScore": 4.0, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-55430", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-08T16:57:10.249359Z", "version": "2.0.3"}}]}, "published": "2026-07-08T01:16:27.270", "references": [{"source": "security-advisories@github.com", "tags": ["Issue Tracking", "Patch"], "url": "https://github.com/coder/coder/pull/26204"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/coder/coder/releases/tag/v2.29.17"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/coder/coder/releases/tag/v2.32.7"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/coder/coder/releases/tag/v2.33.8"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/coder/coder/releases/tag/v2.34.2"}, {"source": "security-advisories@github.com", "tags": ["Patch", "Vendor Advisory"], "url": "https://github.com/coder/coder/security/advisories/GHSA-5g4w-3vw9-478w"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-345"}, {"lang": "en", "value": "CWE-441"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.34.0,2.34.2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.33.0,2.33.8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.30.0,2.32.7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,2.29.17)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "coder", "source": "cna", "vendor": "coder"}, "product": "coder", "vendor": "coder"}], "created": "2026-07-08T02:30:16.599097+00:00", "updated": "2026-08-01T17:00:03.882465+00:00", "vendors": ["coder", "coder$PRODUCT$coder"]}