Improper Authentication in sentry - CVE-2026-102899
Published: July 28, 2026 / Updated: October 16, 2026
Vulnerability identifier: #VU139937
CSH Severity: High
CVSS v4: 8.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-102899
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to take control of any authenticated Sentry user account.
The vulnerability exists due to improper authentication in the SAML SSO process when handling a SAML login flow with an attacker-controlled identity provider and a malicious URL. A remote attacker can trick a user into clicking a crafted link to take control of any authenticated Sentry user account.
This issue affects users accessing the application with browsers that honor SameSite=None cookies, including Firefox, and Chromium-based browsers with third-party cookies enabled.
Affected software
sentry
How to mitigate CVE-2026-102899
Install security update from vendor's website.
sentry - update to 26.7.1