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CVE-2026-100679— stoatchat before 0.15.5 MFA Bypass via Cross-Account Ticket

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 版本之前，存在一个漏洞，未验证多因素认证（MFA）票证是否属于已认证用户。攻击者可以通过使用自己的有效票证配合其他用户的会话令牌，绕过 MFA 验证。攻击者可以从自己的账户中获取一个票证，并将其与受害者的会话令牌结合使用，从而无需提供受害者的凭证即可禁用 TOTP、查看恢复代码或执行其他敏感操作。

CVSS 8.8 · High EPSS 0.32% · P23
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I. Basic Information for CVE-2026-100679

Vulnerability Information
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Vulnerability Title
stoatchat before 0.15.5 MFA Bypass via Cross-Account Ticket
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
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-2026-100679

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III. Intelligence Information for CVE-2026-100679

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Vendor Advisories for CVE-2026-100679 (1)

Other References for CVE-2026-100679 (1)

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

CVE-2026-100676 8.2 HIGH stoatchat before 0.15.5 Local Filesystem Read via SVG
CVE-2026-100678 6.5 MEDIUM stoatchat before 0.15.5 MFA Brute Force via Insufficient Rate Limiting
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-639

V. Comments for CVE-2026-100679

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