---
title: "CVE-2026-25660: Codechecker has an authentication bypass for certain API calls"
url: https://erroneo.us/security/cve/CVE-2026-25660/
description: "CVE-2026-25660 (codechecker (PyPI)): CodeChecker is an analyzer tooling, defect database and viewer extension for the Clang Static Analyzer and Clang Tidy.…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-04-24
date_modified: 2026-05-05
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-25660"
kev: false
cvss: 9.3
epss: 0.00611
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-25660: Codechecker has an authentication bypass for certain API calls

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.6% , percentile 49: FIRST’s model estimates a 0.6% chance of exploitation activity in the next 30 days, higher than 49% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes codechecker (PyPI) <= 6.27.3, no fixed version listed . Check your lockfile, including transitive dependencies.

## What it is

CodeChecker is an analyzer tooling, defect database and viewer extension for the Clang Static Analyzer and Clang Tidy. Authentication bypass occurs when the URL ends with Authentication with certain function calls. This bypass allows assigning arbitrary permission to any user existing in CodeChecker. This issue affects CodeChecker: through 6.27.3.

## Affected packages

- PyPI `codechecker` <= 6.27.3 → fixed: none listed

## Affected products (CVE record)

- Ericsson CodeChecker: <= 6.27.3

## Severity

- ERIC 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/S:N/AU:Y/R:U/V:C/RE:M/U:Red`
- GitHub 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`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.61% probability of exploitation activity in the next 30 days; percentile 49.

## Sources

- [github.com](https://github.com/Ericsson/codechecker/security/advisories/GHSA-4v9x-cqc5-j645)
- [GitHub Advisory GHSA-4v9x-cqc5-j645](https://github.com/advisories/GHSA-4v9x-cqc5-j645)
- [CVE.org record CVE-2026-25660](https://www.cve.org/CVERecord?id=CVE-2026-25660)
- [NVD entry CVE-2026-25660](https://nvd.nist.gov/vuln/detail/CVE-2026-25660)

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Source page: https://erroneo.us/security/cve/CVE-2026-25660/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt