CVE-2026-42354: Sentry

Critical severity, CVSS 9.8. EPSS: 0.7% chance of exploitation in the next 30 days.

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.

Affected products

• Sentry Sentry: from 21.12.0, before 26.4.1 (fixed in 26.4.1)

Published 2026-05-08. Last modified 2026-07-24.