Authentication Bypass by Spoofing in sentry - CVE-2026-42354

Vulnerability details

The vulnerability allows a remote attacker to take over any user account.

The vulnerability exists due to authentication bypass by spoofing in the SAML SSO process when handling authentication with a malicious SAML identity provider across organizations on the same Sentry instance. A remote attacker can use a malicious SAML identity provider and another organization on the same Sentry instance to take over any user account.

The victim email address must be known to exploit the issue. For self-hosted deployments, exploitation requires a multi-organization instance and access to modify SSO settings for another organization.

Affected software

How to mitigate CVE-2026-42354

External References

• https://github.com/getsentry/sentry/security/advisories/GHSA-rcmw-7mc7-3rj7

Related Security Bulletins

• Authentication Bypass by Spoofing in sentry