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CVE-2026-42354

9.1 · CRITICAL

Sentry is an error tracking and performance monitoring tool.

Published May 8, 2026CWE-290EPSS 0.73%

Overview

CVE-2026-42354 is a critical-severity vulnerability. It was published on May 8, 2026 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Sentry is an error tracking and performance monitoring tool. From version 21.12.0 to before version 26.4.1, a critical vulnerability was discovered in the SAML SSO implementation of Sentry. The vulnerability allows an attacker to take over any user account by using a malicious SAML Identity Provider and another organization on the same Sentry instance. The victim email address must be known in order to exploit this vulnerability. This issue has been patched in version 26.4.1.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/getsentry/sentry/commit/0c67558ae7fe08738912d4c5233b53ead048da3bGitHubgithub.com/getsentry/sentry/pull/113720GitHubgithub.com/getsentry/sentry/releases/tag/26.4.1GitHubgithub.com/getsentry/sentry/security/advisories/GHSA-rcmw-7mc7-3rj7

How CyberStrike helps

Frequently asked questions

What is CVE-2026-42354?

CVE-2026-42354 is a critical-severity vulnerability. It was published on May 8, 2026 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2026-42354?

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-42354?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-42354?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-42354 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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