CVE-2026-42354CWE-290

Sentry: Improper authentication on SAML SSO process allows user identity linking

Critical · published May 8, 2026

CVSS v3.1
9.1
EPSS
1%
Percentile
53.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.1 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00729 · 53.7th percentile
Weakness
CWE-290 · Authentication Bypass by Spoofing
Published
2026-05-08T22:58Z
EPSS history
Timeline
  • 08 MAY 22:58Z
    Sentry: Improper authentication on SAML SSO process allows user identity linking
    cvelistv5