Information disclosure in Stoatchat
CVE-2026-100677
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (27.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 27.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.001
Affected products
Weakness classification (CWE)
References
- GitHub Security Advisory (GHSA-h44h-xx2j-hp56) (vendor-advisory)
- VulnCheck Advisory: stoatchat before 0.15.5 Account Enumeration via Error Location (third-party-advisory)
Frequently asked questions
- What is CVE-2026-100677?
- CVE-2026-100677 is a medium-severity vulnerability in Stoatchat, classified under Generation of Error Message Containing Sensitive Information. CVSS score: 5.3/10. Published 2026-09-26.
- How severe is CVE-2026-100677?
- Medium severity. CVSS v3 base score is 5.3 out of 10.