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

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Summary

CVECVE-2026-42354
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-08 23:16:38 UTC
Updated2026-05-08 23:16:38 UTC
DescriptionSentry 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.

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from [email protected]

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

Problem Types: CWE-290 | CWE-290 CWE-290: Authentication Bypass by Spoofing

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1CNADECLARED9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Getsentry Sentry affected >= 21.12.0, < 26.4.1 Not specified

References

ReferenceSourceLinkTags
github.com/getsentry/sentry/commit/0c67558ae7fe08738912d4c5233b53ead048da3b [email protected] github.com
github.com/getsentry/sentry/security/advisories/GHSA-rcmw-7mc7-3rj7 [email protected] github.com
github.com/getsentry/sentry/releases/tag/26.4.1 [email protected] github.com
github.com/getsentry/sentry/pull/113720 [email protected] github.com
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