GHSA-75vm-6w67-gwvp

Source

https://github.com/advisories/GHSA-75vm-6w67-gwvp

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-75vm-6w67-gwvp/GHSA-75vm-6w67-gwvp.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-75vm-6w67-gwvp

Aliases

Published

2026-07-06T20:50:35Z

Modified

2026-07-07T16:11:17Z

Severity

7.4 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator

Summary

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

Details

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_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.

The fix was backported to all supported release lines:

Release line	Patched version
2.34	v2.34.2
2.33	v2.33.8
2.32	v2.32.7
2.29 (ESR)	v2.29.17

Workarounds

Ensure the IdP returns email_verified as a native JSON boolean. The email-fallback linking issue has no configuration workaround; upgrading is required.

Resources

Fix: #25712, #25713

Credits

Coder would like to thank Anthropic's Security Team (ANT-2026-22444) for independently disclosing this issue!

Database specific

{
    "cwe_ids":  [
        "CWE-287",
        "CWE-704"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-07-06T20:50:35Z",
    "nvd_published_at":  null,
    "severity":  "HIGH"
}

References

Affected packages

Go / github.com/coder/coder/v2

Package

Name: github.com/coder/coder/v2; View open source insights on deps.dev
Purl: pkg:golang/github.com/coder/coder/v2

Affected ranges

Type: SEMVER
Events: Introduced

2.34.0

Fixed

2.34.2

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-75vm-6w67-gwvp/GHSA-75vm-6w67-gwvp.json"

Go / github.com/coder/coder/v2

Package

Name: github.com/coder/coder/v2; View open source insights on deps.dev
Purl: pkg:golang/github.com/coder/coder/v2

Affected ranges

Type: SEMVER
Events: Introduced

2.33.0

Fixed

2.33.8

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-75vm-6w67-gwvp/GHSA-75vm-6w67-gwvp.json"

Go / github.com/coder/coder/v2

Package

Name: github.com/coder/coder/v2; View open source insights on deps.dev
Purl: pkg:golang/github.com/coder/coder/v2

Affected ranges

Type: SEMVER
Events: Introduced

2.30.0

Fixed

2.32.7

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-75vm-6w67-gwvp/GHSA-75vm-6w67-gwvp.json"

Go / github.com/coder/coder/v2

Package

Name: github.com/coder/coder/v2; View open source insights on deps.dev
Purl: pkg:golang/github.com/coder/coder/v2

Affected ranges

Type: SEMVER
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

2.29.17

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-75vm-6w67-gwvp/GHSA-75vm-6w67-gwvp.json"