CVE-2026-42354 CRITICAL

CVE-2026-42354: Sentry: Improper authentication on SAML SSO process allows user identity linking

Vendor Getsentry
Product sentry
Weakness CWE-290
Published May 8, 2026
Last update May 11, 2026
View on NVD All CVEs

CVSS base score

9.1/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 8, 2026 CVE published
May 11, 2026 Record updated