CVE-2026-126308
Coder 2.38.0 before 2.38.2 Session Token Leak via Sub-Agent External Apps
The web dashboard in Coder 2.24.0 before 2.29.23, 2.30.0 before 2.34.14, 2.35.0 before 2.36.9, 2.37.0 before 2.37.6, and 2.38.0 before 2.38.2 replaces the $SESSION_TOKEN placeholder in external app URLs with a full-access API key without checking whether the app belongs to a sub-agent. Code running in a workspace can register a disguised sub-agent app with a custom protocol URL, so the owner's click sends their API key to an attacker-chosen destination.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| coder coder github.com/coder/coder/v2
golang |
≥ 2.38.0; < 2.38.2 (affected, semver) 2.38.2 (unaffected, semver) Other versions: unaffected |
CNA: VulnCheck |
| coder coder github.com/coder/coder/v2
golang |
≥ 2.37.0; < 2.37.6 (affected, semver) 2.37.6 (unaffected, semver) Other versions: unaffected |
CNA: VulnCheck |
| coder coder github.com/coder/coder/v2
golang |
≥ 2.36.0; < 2.36.9 (affected, semver) 2.36.9 (unaffected, semver) Other versions: unaffected |
CNA: VulnCheck |
| coder coder github.com/coder/coder/v2
golang |
≥ 2.30.0; < 2.34.14 (affected, semver) 2.34.14 (unaffected, semver) Other versions: unaffected |
CNA: VulnCheck |
| coder coder github.com/coder/coder/v2
golang |
≥ 2.24.0; < 2.29.23 (affected, semver) 2.29.23 (unaffected, semver) Other versions: unaffected |
CNA: VulnCheck |
| coder coder github.com/coder/coder/v2
golang |
≥ 2.35.0; < 2.36.0 (affected, semver) 2.36.0 (unaffected, semver) Other versions: unaffected |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 8.7 high |
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N | CNA: VulnCheck |
| 3.1 / 7.7 high |
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N | CNA: VulnCheck |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/coder/coder/security/advisories/GHSA-2x8w-q434-f76pCNA: VulnCheck · vendor-advisory
- https://www.vulncheck.com/advisories/coder-2.38.0-before-2.38.2-session-token-leak-via-sub-agent-external-appsCNA: VulnCheck · third-party-advisory
For agents and automation
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Endpoints and access details
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A workspace owner or admin can create a Pro or Elite API key. Send Authorization: Bearer <Y2_API_KEY> from your trusted agent runtime.
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