CVE-2026-25660

Critical

Published: 24 April 2026

Published

24 April 2026

Modified

27 April 2026

KEV Added

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Patch

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CVSS Score 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Score 0.0007 21.2th percentile

Risk Priority 20 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-25660 is a critical-severity Authentication Bypass by Spoofing (CWE-290) vulnerability in Ericsson Codechecker. Its CVSS base score is 9.8 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 21.2th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 AC-3 (Access Enforcement) and IA-2 (Identification and Authentication (Organizational Users)).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190) and 1 other technique. What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SI-2 Flaw Remediation good match

prevent

Flaw remediation directly addresses and patches the specific authentication bypass vulnerability in CodeChecker, preventing exploitation.

AC-3 Access Enforcement good match

prevent

Access enforcement mechanisms ensure logical access policies are applied, mitigating the improper bypass that allows unauthorized permission assignments.

IA-2 Identification and Authentication (Organizational Users) good match

prevent

Robust identification and authentication for organizational users prevents authentication bypass vulnerabilities like the URL-based flaw in CodeChecker.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1098 Account Manipulation Persistence

Adversaries may manipulate accounts to maintain and/or elevate access to victim systems.

attack.mitre.org →

Why these techniques?

Remote unauthenticated auth bypass on public-facing CodeChecker web app directly enables T1190; ability to assign arbitrary/elevated permissions to existing users directly enables T1098 Account Manipulation.

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

NVD Description

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.

Deeper analysisAI

CVE-2026-25660 is an authentication bypass vulnerability in CodeChecker, an analyzer tooling, defect database, and viewer extension for the Clang Static Analyzer and Clang Tidy. The issue arises when a URL ends with "Authentication" combined with certain function calls, enabling attackers to bypass authentication and assign arbitrary permissions to any existing user in CodeChecker. It affects all versions of CodeChecker through 6.27.3 and has a CVSS v3.1 base score of 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H), with associated CWEs of CWE-290 (Authentication Bypass) and CWE-863 (Incorrect Authorization).

The vulnerability can be exploited remotely over the network by unauthenticated attackers with no privileges or user interaction required. Successful exploitation allows attackers to grant elevated permissions to arbitrary existing users, potentially leading to full compromise of the CodeChecker instance, including high-impact confidentiality, integrity, and availability violations such as data access, modification, or denial of service.

The GitHub Security Advisory at https://github.com/Ericsson/codechecker/security/advisories/GHSA-4v9x-cqc5-j645 provides further details on the vulnerability, including recommended mitigations and patches. Security practitioners should consult this advisory for version-specific remediation steps.