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CVE-2026-100674 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:4.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/stoatchat/stoatchat/security/advisories/GHSA-qcwh-c934-wrv5	[email protected]
https://www.vulncheck.com/advisories/stoatchat-before-0.15.5-username-validation-bypass-via-unicode-sanitization	[email protected]

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-180	Incorrect Behavior Order: Validate Before Canonicalize	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

1 change record found show changes