Listen to this Post
The vulnerability arises from how Sentry handles SAML SSO authentication in multi-tenant environments. Insecure user identity linking allows an attacker with control over a malicious SAML Identity Provider (IdP) to exploit cross-organization authentication flaws. By knowing a victim’s email address, the attacker can trick the system into linking the victim’s account to an IdP under the attacker’s control from a separate organization within the same Sentry instance. This improper authentication bypass (CWE-287) enables complete account takeover without the need for the victim’s credentials or any interaction. The attack is feasible when multiple organizations exist (SENTRY_SINGLE_ORGANIZATION = False) and the attacker already has permissions to modify SSO settings for another organization.
DailyCVE Form
Platform: Sentry
Version: 21.12.0-26.1.0
Vulnerability: SAML SSO takeover
Severity: 9.1 Critical
date: 2026-02-21
Prediction: Patch already available
What Undercode Say:
Analytics
Check Sentry version for vulnerability sentry_version=$(sentry --version | grep -oP '\d+.\d+.\d+') echo "Detected Sentry version: $sentry_version" if [[ "$sentry_version" < "26.2.0" ]]; then echo "CRITICAL: Vulnerable to CVE-2026-27197" fi
Exploit:
An attacker uses a malicious SAML IdP and another organization to link a victim’s account without authentication.
Protection from this CVE:
Enable 2FA for all user accounts, upgrade to Sentry 26.2.0 or higher, or set SENTRY_SINGLE_ORGANIZATION = True.
Impact:
Complete user account takeover, leading to unauthorized access to sensitive error data, performance metrics, and potentially downstream systems.
🎯Let’s Practice Exploiting & Learn Patching For Free:
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
