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TI-2026-64834 Aliases CVE-2026-100678GHSA-qgwf-mjq4-r7pg

stoatchat before 0.15.5 MFA Brute Force via Insufficient Rate Limiting

Priority HIGH 69CWE-307Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-307.

Summary

stoatchat before 0.15.5 fails to enforce account-level attempt limits on MFA login challenges, allowing attackers who know a password to guess TOTP codes with only IP-based rate limiting. Attackers can reuse MFA challenge tickets across multiple failed attempts and distribute guesses across IP addresses to bypass rate limiting and gain account access.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00299 22nd percentileScored 2026-11-07
Fix Fixed stoatchat (stoatchat): 0.15.5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

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-2026-64835 stoatchat before 0.15.5 MFA Bypass via Cross-Account TicketPriority HIGH 66
    Show all 6 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-100678
  2. 2026-10-03 Alias added: GHSA-qgwf-mjq4-r7pg

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