All vulnerabilities
CVE-2026-100674GHSA-qcwh-c934-wrv5

stoatchat before 0.15.5 Username Validation Bypass via Unicode Sanitization

stoatchat stoatchat
Open in ThreatlineRecord JSON
CVSS
5.3Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.23%Chance of exploitation activity in the next 30 days, higher than 13% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in0.15.5Fixed versionCVE List
Published26 Sep 2026Updated 30 Sep 2026CVE List

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List

Affected versions 2

  • stoatchataffected: all versions before 0.15.5CVE List
  • stoatchatunaffected: 0.15.5CVE List

References 2