An issue in the component route\user.php of Xiuno BBS v4.0.4 allows attackers to enumerate usernames.
Priority LOW 26Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
An issue in the component route\user.php of Xiuno BBS v4.0.4 allows attackers to enumerate usernames.
Why it matters now
EPSS 0.00999 62nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2020-21493
- 2026-10-03 Alias added: GHSA-4hxw-v2j3-4qv8
References
More Xiunobbs vulnerabilities
- TI-2019-14425 Xiuno BBS 4.0 allows XXE via plugin/xn_wechat_public/route/token.php. CVSS 3.1HIGH 7.5
- TI-2020-13740 Cross Site Scripting (XSS) in xiunobbs 4.0.4 allows remote attackers to execute arbitrary… CVSS 3.1MEDIUM 6.1
- TI-2020-14071 A cross-site scripting (XSS) vulnerability in the component /admin/?setting-base.htm of… CVSS 3.1MEDIUM 6.1
- TI-2020-14070 A cross-site scripting (XSS) vulnerability in the component /admin/?setting-base.htm of… CVSS 3.1MEDIUM 6.1
- TI-2020-14069 A cross-site scripting (XSS) vulnerability in the component install\install.sql of Xiuno… CVSS 3.1MEDIUM 6.1
- TI-2018-11095 The editor in Xiuno BBS 4.0.4 allows stored XSS. CVSS 3.0MEDIUM 6.1
Sources
- CVE-2020-21493 · CVE Program
- CVE-2020-21493 · NVD
- FIRST EPSS
- GHSA-4hxw-v2j3-4qv8 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences