{"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": "2026-07-08T00:03:29.728Z"}, "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"}}}}

{}

{}

{}

{"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": "2026-07-08T02:30:16.599117+00:00", "vendors": ["coder", "coder$PRODUCT$coder"]}