CVE-2026-27197
📋 TL;DR
This critical vulnerability in Sentry's SAML SSO implementation allows attackers to take over any user account by exploiting misconfigured multi-organization instances. Self-hosted Sentry deployments with multiple organizations are primarily affected, especially when SENTRY_SINGLE_ORGANIZATION is set to True or when malicious users have SSO configuration access. The vulnerability enables complete account compromise through authentication bypass.
💻 Affected Systems
- Sentry
📦 What is this software?
Sentry by Sentry
⚠️ Risk & Real-World Impact
Worst Case
Complete account takeover of any user, including administrators, leading to data theft, privilege escalation, and full system compromise.
Likely Case
Targeted account takeover of specific users by attackers with existing access to SSO configuration settings in multi-organization environments.
If Mitigated
Limited impact if 2FA is enabled on all accounts, as attackers cannot complete authentication even with compromised credentials.
🎯 Exploit Status
Requires attacker to have access to configure SSO settings for another organization or exploit multi-org misconfigurations.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 26.2.0
Vendor Advisory: https://github.com/getsentry/sentry/security/advisories/GHSA-ggmg-cqg6-j45g
Restart Required: Yes
Instructions:
1. Backup your Sentry instance. 2. Update to Sentry version 26.2.0 or later. 3. Restart all Sentry services. 4. Verify the update was successful.
🔧 Temporary Workarounds
Enable Two-Factor Authentication
allRequire all users to enable 2FA on their accounts to prevent attackers from completing authentication even with compromised credentials.
🧯 If You Can't Patch
- Enable mandatory 2FA for all user accounts immediately
- Review and restrict SSO configuration permissions to trusted administrators only
🔍 How to Verify
Check if Vulnerable:
Check Sentry version and verify if running 21.12.0 through 26.1.0 with multiple organizations configured.Check Version:
sentry --versionVerify Fix Applied:
Confirm Sentry version is 26.2.0 or later and test SAML SSO functionality.📡 Detection & Monitoring
Log Indicators:
- Unusual SAML authentication attempts
- SSO configuration changes from unexpected users
- Multiple failed login attempts followed by successful SAML auth
Network Indicators:
- SAML requests from unexpected identity providers
- Authentication traffic patterns deviating from normal
SIEM Query:
source="sentry" AND (event="sso_config_change" OR event="saml_auth" AND result="success") | stats count by user, src_ip