CVE-2026-100677: Stoatchat

Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days.

stoatchat before 0.15.5 contains an account enumeration vulnerability in the login endpoint that exposes source file locations in error responses. Unauthenticated attackers can distinguish between registered and unregistered email addresses by comparing error location fields returned from POST /api/auth/session/login requests.

Affected products

• Stoatchat Stoatchat: before 0.15.5 (fixed in 0.15.5)

Published 2026-09-26. Last modified 2026-09-30.