CVE-2026-55076
published 2026-07-07CVE-2026-55076: 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…
PriorityP348high7.4CVSS 3.1
AVNACHPRNUINSUCHIHAN
EPSS
0.61%
47.9th percentile
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.
Affected
11 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| coder | coder | < 2.29.17 | 2.29.17 |
| coder | coder | — | — |
| coder | coder | — | — |
| coder | coder | — | — |
| coder | coder | >= 2.30.0 < 2.32.7 | 2.32.7 |
| coder | coder | >= 2.33.0 < 2.33.8 | 2.33.8 |
| coder | coder | >= 2.34.0 < 2.34.2 | 2.34.2 |
| github.com | coder_coder_v2 | >= 0 < 2.29.17 | 2.29.17 |
| github.com | coder_coder_v2 | >= 2.30.0 < 2.32.7 | 2.32.7 |
| github.com | coder_coder_v2 | >= 2.33.0 < 2.33.8 | 2.33.8 |
| github.com | coder_coder_v2 | >= 2.34.0 < 2.34.2 | 2.34.2 |
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VulDB
Coder up to 2.29.6/2.32.6/2.33.7/2.34.1 OIDC Callback assertion
vuldb·2026-07-08·CVSS 7.4
CVE-2026-55076 [HIGH] Coder up to 2.29.6/2.32.6/2.33.7/2.34.1 OIDC Callback assertion
A vulnerability marked as critical has been reported in Coder up to 2.29.6/2.32.6/2.33.7/2.34.1. The affected element is an unknown function of the component OIDC Callback Handler. This manipulation causes reachable assertion.
This vulnerability appears as CVE-2026-55076. The attack may be initiated remotely. There is no available exploit.
GHSA
Coder's OIDC email_verified type coercion bypass enables account takeover via unverified email linking
ghsa·2026-07-06
CVE-2026-55076 [HIGH] CWE-287 Coder's OIDC email_verified type coercion bypass enables account takeover via unverified email linking
Coder's OIDC email_verified type coercion bypass enables account takeover via unverified email linking
### Summary
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.
### Impact
An attacker who registered a victim's email at a compatible IdP without verifying it could log in via OIDC and be matched to the victim's existing Coder account, receiving a session for that account. No prior authentication to Coder was required and the result was full account takeover.
### Patches
The fix coerces `email_ver
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
https://github.com/coder/coder/pull/25712https://github.com/coder/coder/pull/25713https://github.com/coder/coder/releases/tag/v2.29.17https://github.com/coder/coder/releases/tag/v2.32.7https://github.com/coder/coder/releases/tag/v2.33.8https://github.com/coder/coder/releases/tag/v2.34.2https://github.com/coder/coder/security/advisories/GHSA-75vm-6w67-gwvp
2026-07-07
Published