CVE-2026-55431
- Source
- https://cve.org/CVERecord?id=CVE-2026-55431
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55431.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-55431
- Aliases
- Published
- 2026-07-08T00:10:49.165Z
- Modified
- 2026-07-10T04:01:36.128063033Z
- Severity
-
- 7.7 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N CVSS Calculator
- Summary
- Coder's session token leaked to arbitrary hosts via `coder open app` for external workspace apps
- 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,
coder open appopens external workspace-app URLs without validating the scheme or host. When an external app URL contains the$SESSION_TOKENplaceholder the CLI replaces it with the user's real session token before handing the URL to the OS open handler. Practical exploitation requires the victim to runcoder open appagainst a workspace whose external app definition the attacker controls. Only a malicious template author can control external app URLs. The fix in versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2 applies a URL-scheme allowlist in the CLI and limits$SESSION_TOKENsubstitution to trusted destinations like the web frontend. As a workaround, avoid runningcoder open appfor untrusted workspaces. - Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55431.json", "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-522", "CWE-601" ] }- 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-2026-55431.json
- https://github.com/coder/coder/security/advisories/GHSA-v54h-cp2w-9x4g
- https://nvd.nist.gov/vuln/detail/CVE-2026-55431
- https://github.com/coder/coder/pull/26146
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" } ] }