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CVE-2026-100678— stoatchat before 0.15.5 MFA Brute Force via Insufficient Rate Limiting

Quick assessment

Affected
stoatchat stoatchat
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 stoatchat 0.15.5 之前的版本中，系统在多因素认证（MFA）登录挑战时未正确实施账户级别的尝试次数限制。这使得那些已知用户密码的攻击者，能够仅依靠基于 IP 地址的速率限制来暴力猜测时间一次性密码（TOTP）码。攻击者可以在多次失败的尝试中重复使用 MFA 挑战票据，并通过分散猜测请求至多个不同 IP 地址，从而绕过速率限制，最终获得对目标账户的非法访问权限。

CVSS 6.5 · Medium EPSS 0.24% · P14

Possible ATT&CK Techniques 1 AI

T1110 · Brute Force
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I. Basic Information for CVE-2026-100678

Vulnerability Information
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Vulnerability Title
stoatchat before 0.15.5 MFA Brute Force via Insufficient Rate Limiting
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
过多认证尝试的限制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
stoatchat stoatchat 0 ~ 0.15.5 -

II. Public POCs for CVE-2026-100678

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III. Intelligence Information for CVE-2026-100678

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Vendor Advisories for CVE-2026-100678 (1)

Other References for CVE-2026-100678 (1)

Same Patch Batch · stoatchat · 2026-09-26 · 6 CVEs total

CVE-2026-100679 8.8 HIGH stoatchat before 0.15.5 MFA Bypass via Cross-Account Ticket
CVE-2026-100676 8.2 HIGH stoatchat before 0.15.5 Local Filesystem Read via SVG
CVE-2026-100675 6.5 MEDIUM stoatchat before 0.15.5 Denial of Service via mass mentions
CVE-2026-100677 5.3 MEDIUM stoatchat before 0.15.5 Account Enumeration via Error Location
CVE-2026-100674 4.3 MEDIUM stoatchat before 0.15.5 Username Validation Bypass via Unicode Sanitization

IV. Related Vulnerabilities

Same product: stoatchat
Same vendor: stoatchat
Same weakness: CWE-307

V. Comments for CVE-2026-100678

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