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CVE-2026-100674— stoatchat before 0.15.5 Username Validation Bypass via Unicode Sanitization

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 Unicode 清洗后未能对用户名进行重新验证，攻击者可以通过提交经过转换的 Unicode 字符来绕过限制，从而创建包含非法字符的用户名。攻击者可以绕过字符白名单和长度限制，创建与保留名称相似的别名、嵌入特殊字符，并超过 32 个字符的存储限制。

CVSS 4.3 · Medium EPSS 0.23% · P13

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-100674

Vulnerability Information
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Vulnerability Title
stoatchat before 0.15.5 Username Validation Bypass via Unicode Sanitization
Source: CVE Program / CVE List V5
Vulnerability Description
stoatchat before 0.15.5 fails to revalidate usernames after Unicode sanitization, allowing attackers to create usernames with forbidden characters by submitting Unicode letters that transform into rejected characters. Attackers can bypass character allowlists and length limits to create reserved-name lookalikes, embed special characters, and exceed the 32-character storage limit.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不正确的行为次序：规范化之前验证
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-2026-100674

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III. Intelligence Information for CVE-2026-100674

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Vendor Advisories for CVE-2026-100674 (1)

Other References for CVE-2026-100674 (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-2026-100678 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

IV. Related Vulnerabilities

Same product: stoatchat
Same vendor: stoatchat
Same weakness: CWE-180

V. Comments for CVE-2026-100674

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