CVE-2026-55076 PUBLISHED

Coder's OIDC email_verified type coercion bypass enables account takeover via unverified email linking

Assigner: GitHub_M
Reserved: 16.06.2026 Published: 07.07.2026 Updated: 08.07.2026

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's OIDC callback checked email_verified with a direct Go bool type assertion. When an IdP returned the claim as a non-boolean (for example the string "false") or omitted it, the assertion failed open and the email was treated as verified. Combined with an unconditional email-based account fallback, this enabled account takeover. The fix in versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2 coerces email_verified across bool, string and numeric types (fail-closed) and blocks the email fallback when the matched user already has a different linked IdP subject. As a workaround, ensure the IdP returns email_verified as a native JSON boolean. The email-fallback linking issue has no configuration workaround; upgrading is required.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS Score: 7.4

Product Status

Vendor coder
Product coder
Versions
  • Version >= 2.34.0, < 2.34.2 is affected
  • Version >= 2.33.0, < 2.33.8 is affected
  • Version >= 2.30.0, < 2.32.7 is affected
  • Version < 2.29.17 is affected

References

Problem Types

  • CWE-287: Improper Authentication CWE
  • CWE-704: Incorrect Type Conversion or Cast CWE