critical · 9.3 No patch yet

Codechecker has an authentication bypass for certain API calls

CVE-2026-25660 · GHSA-4v9x-cqc5-j645 · PYSEC-2026-317 · published 5 May 2026

How serious is it

  • Severity: critical, CVSS score 9.3 out of 10.
  • No exploit prediction (EPSS) score yet.
  • Not on the CISA list of exploited vulnerabilities.
  • No public exploit in Exploit-DB.

Is your app affected by CVE-2026-25660?

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Who is affected

  • codechecker (PyPI) <= 6.27.3

How to check

  1. Run pip show codechecker in your project to see the installed version, including copies pulled in by other packages.
  2. Or paste your lockfile into the checker: it lists every package with a known vulnerability, this one included.
  3. Or run npx shippable-dev scan localhost:3000 in your project folder. It reads your lockfile and flags this vulnerability along with every other known one.

How to fix

Copies a prompt for Claude Code, Cursor or Codex: it checks your lockfiles for this and upgrades it.
  1. No fixed version of codechecker yet. Replace or remove it, or apply the workaround in the advisory below.
  2. If a vulnerable version was live, check your logs and rotate the secrets that server could read.

The advisory

### 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.

Check your whole app

Dependencies are only half of it. Free and read-only: before you push, run npx shippable-dev scan localhost:3000 in your project folder, no account needed. For your live app, you prove it's yours with a one-line tag first.

References

Merged from GitHub Advisory Database, OSV. Last updated 28 Oct 2026. All vulnerabilities · RSS · JSON

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