CVE-2026-100679CWE-639

CVE-2026-100679

High · published September 26, 2026

CVSS v3.1
8.8
EPSS
0%
Percentile
24.0
In the wild
Unconfirmed
What it is

stoatchat before 0.15.5 fails to validate that MFA tickets belong to the authenticated user, allowing attackers to bypass MFA by using their own valid ticket with another user's session token. Attackers can obtain a ticket from their own account and use it with a victim's session token to disable TOTP, view recovery codes, or perform other sensitive operations without providing the victim's credentials.

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
7.1 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
EPSS
0.00322 · 24.0th percentile
Weakness
CWE-639 · Authorization Bypass Through User-Controlled Key
Published
2026-09-26T18:16Z
References (3)
https://github.com/stoatchat/stoatchat/security/advisories/GHSA-gwg6-q3c3-97cx · [email protected]https://www.vulncheck.com/advisories/stoatchat-before-0.15.5-mfa-bypass-via-cross-account-ticket · [email protected]https://github.com/stoatchat/stoatchat/security/advisories/GHSA-gwg6-q3c3-97cx · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 28 SEP 03:25Z
    EPSS moved — → 0%
    epss
  • 26 SEP 13:23Z
    stoatchat before 0.15.5 MFA Bypass via Cross-Account Ticket
    cvelistv5