Codechecker has an authentication bypass for certain API calls

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

9.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P · score source

EPSS

• CVE-2026-25660: 0.45% estimated exploitation activity in the next 30 days; percentile 38.92 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary Authentication bypass occurs when the URL ends with Authentication with certain function calls. This bypass allows assigning arbitrary permissions to any existing user in CodeChecker.

Details The following functions are affected under the Authentication endpoint: `getAuthorisedNames`, `getPermissionsForUser`, `hasPermission`, `addPermission`, and `removePermission`. The vulnerability allows unauthenticated users to execute these function calls with arbitrary arguments. In the logs, the exploit shows as follows: ``` [INFO 2026-04-23 21:23] - 127.0.0.1:42654 -- [Anonymous] POST /v6.67/Authentication@getAuthorisedNames [INFO 2026-04-23 21:23] - 127.0.0.1:42654 -- [Anonymous] POST /v6.67/Authentication@addPermission ```

Impact An attacker with a CodeChecker user can effectively acquire superuser permissions by calling these endpoints.

Patch A patch is available at https://github.com/Ericsson/codechecker/releases/tag/v6.27.4.

Published by the source

5 May 2026, 17:58 UTC

Last modified by the source

27 Oct 2026, 16:45 UTC

Source last checked

28 Oct 2026, 06:10 UTC

1. Revision 6 · amended · 28 Oct 2026

   Amended from osv record GHSA-4v9x-cqc5-j645

2. Revision 5 · amended · 27 Oct 2026

   Amended from ghsa record GHSA-4v9x-cqc5-j645

3. Revision 4 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-4v9x-cqc5-j645

4. Revision 3 · amended · 25 Oct 2026

   Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

5. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GHSA-4v9x-cqc5-j645

6. Revision 1 · created · 23 Oct 2026

   Published from ghsa record GHSA-4v9x-cqc5-j645

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# Patch Next advisory brief: CVE-2026-25660

Advisory: Codechecker has an authentication bypass for certain API calls
IDs: CVE-2026-25660, GHSA-4v9x-cqc5-j645
Record: https://patchnext.com/advisories/cve-2026-25660 (revision 6, source checked 28 Oct 2026, 06:10 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI codechecker: affected <= 6.27.3

## Suggested inspection (read-only)
- `python -m pip show codechecker`: prints the installed version. Run with the environment that serves production active.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on codechecker.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-4v9x-cqc5-j645 (GitHub-reviewed advisory GHSA-4v9x-cqc5-j645 lists affected ranges: PyPI codechecker >=0 <=6.27.3)
- Verified: https://osv.dev/vulnerability/GHSA-4v9x-cqc5-j645 (OSV record GHSA-4v9x-cqc5-j645 lists affected ranges: PyPI codechecker >=0 <=6.27.3)

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