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TI-2026-64835 Aliases CVE-2026-100679GHSA-2jwx-p7f6-684c

stoatchat before 0.15.5 MFA Bypass via Cross-Account Ticket

Priority HIGH 66CWE-639Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-639.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00407 35th percentileScored 2026-11-08
Fix Fixed stoatchat (stoatchat): 0.15.5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
stoatchatstoatchatbefore 0.15.50.15.5Patch availableCNA
  • stoatchat Vendorstoatchat Affected before 0.15.5 Fixed in 0.15.5 Patch available CNA

Remediation

  • Fix · CNA stoatchat (stoatchat) Fixed in 0.15.5

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    stoatchat 0.15.5

    6 records Highest priority Priority HIGH 4 HIGH, 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-64832 stoatchat before 0.15.5 Local Filesystem Read via SVGPriority HIGH 77
    • TI-2026-64833 stoatchat before 0.15.5 Account Enumeration via Error LocationPriority HIGH 70
    • TI-2026-64834 stoatchat before 0.15.5 MFA Brute Force via Insufficient Rate LimitingPriority HIGH 69
    Show all 6 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-100679
  2. 2026-10-03 Alias added: GHSA-2jwx-p7f6-684c

References

Advisory 1

  • TI-2026-45152 stoatchat before 0.13.5 Unauthenticated SSRF via proxy and embed endpoints CVSS 4.0CRITICAL 9.2
  • TI-2026-64832 stoatchat before 0.15.5 Local Filesystem Read via SVG CVSS 4.0HIGH 8.8
  • TI-2026-51266 stoatchat before 0.15.0 Uncapped SVG Rendering Denial of Service CVSS 4.0HIGH 8.7
  • TI-2026-45038 stoatchat < 0.14.0 SSRF via DNS-based IP Blocklist Bypass CVSS 4.0HIGH 7.7
  • TI-2026-64833 stoatchat before 0.15.5 Account Enumeration via Error Location CVSS 4.0MEDIUM 6.9
  • TI-2026-51267 stoatchat before 0.15.0 SSRF via IPv6 unspecified address bypass CVSS 4.0MEDIUM 6.9
See all 15 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences