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Advisories

stoatchat before 0.15.5 Username Validation Bypass via Unicode Sanitization

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severity
medium
date
Affecting

  • stoatchat >= 0, < 0.15.5

CWE
  • CWE-180 Incorrect Behavior Order: Validate Before Canonicalize
CVSS
5.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
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.

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