What’s Vulnerable › Vulnerabilities

CVE-2021-29399

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-04-19 · updated 2026-06-17
• Weakness: CWE-79

Description

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.

Affected products

• xmbforum2 Xmb: from 1.9.1 before 1.9.11.16; from 1.9.11 before 1.9.11.16; from 1.9.12 before 1.9.12.03 — fixed in 1.9.11.16, 1.9.12.03

How to fix

Upgrade to a fixed version: xmbforum2 Xmb 1.9.11.16, 1.9.12.03. Check the vendor advisory for mitigations.

References

• https://docs.xmbforum2.com/index.php?title=Security_Issue_History
• https://forums.xmbforum2.com/viewthread.php?tid=777105
• https://www.xmbforum2.com/
• https://docs.xmbforum2.com/index.php?title=Security_Issue_History
• https://forums.xmbforum2.com/viewthread.php?tid=777105
• https://www.xmbforum2.com/

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