What’s Vulnerable › Vulnerabilities

CVE-2026-100677: stoatchat before 0.15.5 Account Enumeration via Error Location

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-26 · updated 2026-09-30
• Weakness: CWE-209

Description

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: before 0.15.5 — fixed in 0.15.5

How to fix

Upgrade to a fixed version: stoatchat 0.15.5. Check the vendor advisory for mitigations.

References

• https://github.com/stoatchat/stoatchat/security/advisories/GHSA-h44h-xx2j-hp56
• https://www.vulncheck.com/advisories/stoatchat-before-0.15.5-account-enumeration-via-error-location
• https://github.com/stoatchat/stoatchat/security/advisories/GHSA-h44h-xx2j-hp56

Get alerted when CVE-2026-100677 or the next vulnerability affects your stack