CVE-2026-42354

CRITICAL

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

Title source: cna
STIX 2.1

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.

References (4)

Core 4

Scores

CVSS v3 9.1
EPSS 0.0001
EPSS Percentile 1.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact total

Details

CWE
CWE-290
Status published
Products (3)
getsentry/sentry >= 21.12.0, < 26.4.1
pypi/sentry 21.12.0 - 26.4.1PyPI
sentry/sentry 21.12.0 - 26.4.1
Published May 08, 2026
Tracked Since May 09, 2026