Home/CVE/Sentry is an error tracking and performance monitoring tool. From version 21.12.0 to before version 26.4.1, a critical v
CVE

CVE-2026-42354

Sentry is an error tracking and performance monitoring tool. From version 21.12.0 to before version 26.4.1, a critical v

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.

CRITICAL · CVSS 9.1 EPSS 0.00011
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-290Authentication Bypass by Spoofing
▤

Affected Products & Versions

1
sentry>= 21.12.0 and < 26.4.1
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
PyPI sentry CRITICAL fixed in 26.4.1
▣

Scoring & Timeline

9.1
CRITICAL · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD08 May 2026 · 11:16 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

4
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/getsentry/sentry/commit/0c67558ae7fe08738912d4c5233b53ead048da3bPatch
https://github.com/getsentry/sentry/pull/113720Issue TrackingPatch
https://github.com/getsentry/sentry/releases/tag/26.4.1ProductRelease Notes
https://github.com/getsentry/sentry/security/advisories/GHSA-rcmw-7mc7-3rj7MitigationVendor Advisory
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