CVE-2021-29399 json
XMB is vulnerable to cross-site scripting (XSS) due to inadequate filtering of BBCode input.
published 2021-04-19 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-16034
- cvss
- 6.1
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.9%
- EPSS 0.9% chance of exploitation in 30 days, percentile 60%
- public exploits
- 0
- none known
Summary
XMB is vulnerable to cross-site scripting (XSS) due to inadequate filtering of BBCode input. This bug affects all versions of XMB. All XMB installations must be updated to versions 1.9.12.03 or 1.9.11.16.
Patch / fix
Exploit prediction
0.91% chance of exploitation in the next 30 days, higher than 60% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N |
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
forums.xmbforum2.com
/viewthread.php?tid=777105
patch, vendor-advisory
-
xmbforum2.com
/
vendor-advisory
-
docs.xmbforum2.com
/index.php?title=Security_Issue_History
vendor-advisory
Sources
- CVE List CVE-2021-29399
- NVD CVE-2021-29399
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.