by Kastro
Paper/Archive/CVE-2026-42354

CVE-2026-42354

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

EPSS 0.6%CVSS 9.8
critical.is priorityof 100
39
CVSS 9.8 (NVD)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 49.9.499 × 2010.0No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
sentry>= 21.12.0, < 26.4.1–CNA

Scores by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GitHub_M (CNA)9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refgithub.com/getsentry/sentry/security/advisories/GHSA-rcmw-7mc7-3rj7refgithub.com/getsentry/sentry/pull/113720refgithub.com/getsentry/sentry/commit/0c67558ae7fe08738912d4c5233b53ead048da3brefgithub.com/getsentry/sentry/releases/tag/26.4.1