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

Description

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.

Scores

EPSS (exploitation in 30 days)

0.61% · top 51% of all CVEs (6 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.4.

Weakness

• CWE-287: Improper Authentication (opens in a new tab)All about CWE-287 and its CVEs
• CWE-704: Incorrect Type Conversion or Cast (opens in a new tab)All about CWE-704 and its CVEs

Affected products

• coder · coder

  • affected >= 2.34.0, < 2.34.2
  • affected >= 2.33.0, < 2.33.8
  • affected >= 2.30.0, < 2.32.7
  • affected < 2.29.17

Affected packages

From reviewed advisories of the GitHub Advisory Database.

• Gogithub.com/coder/coder/v2GHSA-75vm-6w67-gwvp (opens in a new tab)

References (7)

• https://github.com/coder/coder/security/advisories/GHSA-75vm-6w67-gwvp (opens in a new tab)x_refsource_CONFIRM
• https://github.com/coder/coder/pull/25712 (opens in a new tab)x_refsource_MISC
• https://github.com/coder/coder/pull/25713 (opens in a new tab)x_refsource_MISC
• https://github.com/coder/coder/releases/tag/v2.29.17 (opens in a new tab)x_refsource_MISC
• https://github.com/coder/coder/releases/tag/v2.32.7 (opens in a new tab)x_refsource_MISC
• https://github.com/coder/coder/releases/tag/v2.33.8 (opens in a new tab)x_refsource_MISC
• https://github.com/coder/coder/releases/tag/v2.34.2 (opens in a new tab)x_refsource_MISC

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisory GHSA-75vm-6w67-gwvp (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-55076](https://trackcve.app/badge/CVE-2026-55076.svg)](https://trackcve.app/cve/CVE-2026-55076)

Record last updated 8 Jul 2026, 14:03 UTC.