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.
Published: 2026-09-26
Score: 5.3 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Wed, 30 Sep 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Sat, 26 Sep 2026 17:15:00 +0000

Type Values Removed Values Added
First Time appeared Stoatchat
Stoatchat stoatchat
Vendors & Products Stoatchat
Stoatchat stoatchat

Sat, 26 Sep 2026 13:30:00 +0000

Type Values Removed Values Added
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.
Title stoatchat before 0.15.5 Username Validation Bypass via Unicode Sanitization
Weaknesses CWE-180
References
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N'}

cvssV4_0

{'score': 5.3, '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'}


Subscriptions

Stoatchat Stoatchat
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-30T14:58:59.656Z

Reserved: 2026-09-26T02:34:55.635Z

Link: CVE-2026-100674

cve-icon Vulnrichment

Updated: 2026-09-30T14:58:54.578Z

cve-icon NVD

Status : Deferred

Published: 2026-09-26T14:16:51.297

Modified: 2026-09-30T15:22:16.023

Link: CVE-2026-100674

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-26T17:00:14Z

Weaknesses