CVE-2026-55430
- Source
- https://cve.org/CVERecord?id=CVE-2026-55430
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55430.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-55430
- Aliases
- Published
- 2026-07-08T00:03:29.728Z
- Modified
- 2026-07-10T04:02:53.394517416Z
- Severity
-
- 5.8 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:N/A:N CVSS Calculator
- Summary
- Coder's subdomain workspace app routing trusts unauthenticated X-Forwarded-Host header, enabling cross-app data access
- Details
-
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 theX-Forwarded-Hostheader over the realHostheader. No middleware stripsX-Forwarded-Hostbefore routing and the header is not browser-forbidden so client-side JavaScript can set it onfetch()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 stripX-Forwarded-Host. The fix in versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2 trustsX-Forwarded-Hostonly 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 overwritesX-Forwarded-Hoston untrusted requests. - Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55430.json", "cwe_ids": [ "CWE-345", "CWE-441" ], "cna_assigner": "GitHub_M" }- References
-
- https://github.com/coder/coder/releases/tag/v2.29.17
- https://github.com/coder/coder/releases/tag/v2.32.7
- https://github.com/coder/coder/releases/tag/v2.33.8
- https://github.com/coder/coder/releases/tag/v2.34.2
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55430.json
- https://github.com/coder/coder/security/advisories/GHSA-5g4w-3vw9-478w
- https://nvd.nist.gov/vuln/detail/CVE-2026-55430
- https://github.com/coder/coder/pull/26204
Affected packages
Git / github.com/coder/coder
Affected ranges
- Type
- GIT
- Repo
- https://github.com/coder/coder
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixedIntroducedFixedIntroducedFixedIntroducedFixed
- Database specific
{ "source": [ "CPE_RANGE", "REFERENCES" ], "cpe": "cpe:2.3:a:coder:coder:*:*:*:*:*:go:*:*", "extracted_events": [ { "introduced": "0" }, { "fixed": "2.29.17" }, { "introduced": "2.30.0" }, { "fixed": "2.32.7" }, { "introduced": "2.33.0" }, { "fixed": "2.33.8" }, { "introduced": "2.34.0" }, { "fixed": "2.34.2" } ] }