CVE-2026-42354

Name: CVE-2026-42354
Creator: NVD / NIST
Published: 2026-05-08T23:16:38.513+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 0.62%

Last modified Jun 17, 2026

CVE-2026-42354 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 0.62% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

0.62%

45.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-290

Affected Software

Vendor	Product	Versions
Sentry	Sentry	>= 21.12.0, < 26.4.1

References

https://github.com/getsentry/sentry/commit/0c67558ae7fe08738912d4c5233b53ead048da3bPatch
https://github.com/getsentry/sentry/pull/113720Issue Tracking, Patch
https://github.com/getsentry/sentry/releases/tag/26.4.1Product, Release Notes
https://github.com/getsentry/sentry/security/advisories/GHSA-rcmw-7mc7-3rj7Mitigation, Vendor Advisory

Timeline

Published: May 8, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-42354?

How severe is CVE-2026-42354?

CVE-2026-42354 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.62% probability of exploitation in the next 30 days.

How do I fix CVE-2026-42354?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-42354?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST