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.

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 2026-09-26.

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

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Stoatchat

Weakness classification (CWE)

CWE-209 — Generation of Error Message Containing Sensitive Information

References

github.com/stoatchat/stoatchat/security/advisories/GHSA-h44h-xx2j-hp56 (vendor-advisory)
www.vulncheck.com/advisories/stoatchat-before-0.15.5-account-enumeration-via-er… (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.