Medium severity · published Oct 28, 2026
CVE-2026-118687
Coder before 2.29.21, 2.34.12, 2.35.9, 2.36.7, and 2.37.4 Missing Audience Validation in GCP Instance-Identity Authentication
New
6.5
CVSS
–
EPSS
No
On KEV
Description
Coder before 2.29.21, 2.30.0 before 2.34.12, 2.35.0 before 2.35.9, 2.36.0 before 2.36.7, and 2.37.0 before 2.37.4 does not validate the audience claim of GCE instance-identity JWTs at the POST /api/v2/workspaceagents/google-instance-identity endpoint. Attackers who obtain an unexpired format=full identity token minted for another relying party can replay it to obtain that workspace agent's session token, which remains valid until the workspace's next build.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CO
coder · coder
2.37.0 before 2.37.4; 2.36.0 before 2.36.7; 2.35.0 before 2.35.9; 2.30.0 before 2.34.12; before 2.29.21 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-118687
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-118687
vendor-advisory
https://github.com/coder/coder/security/advisories/GHSA-24vh-q7rg-243w
third-party-advisory
https://www.vulncheck.com/advisories/coder-before-2.29.21-2.34.12-2.35.9-2.36.7-and-2.37.4-missing-audience-validation-in-gcp-instance-identity-authentication
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