SB2026102175 - Authentication Bypass by Alternate Name in sentry

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Main Vulnerability Database SB2026102175

SB2026102175 - Authentication Bypass by Alternate Name in sentry

Published: October 21, 2026

Security Bulletin ID SB2026102175
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Authentication Bypass by Alternate Name (CVE-ID: N/A)

CWE-ID: CWE-289 - Authentication Bypass by Alternate Name

CVSSv4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote user to take over a victim's Sentry account.

The vulnerability exists due to improper email matching in Sentry's SAML SSO implementation when processing email claims containing lookalike domain names. A remote user can configure a malicious SAML server to emit an email claim using the dotless-i character ı (U+0131), such as foo@vıctim.com instead of foo@victim.com, to impersonate the victim and take over their account.

For self-hosted instances, exploitation requires SENTRY_SINGLE_ORGANIZATION to be False.


Remediation

Install update from vendor's website.

References