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CVE-2021-29399

21
FAUCET Score

CVE-2021-29399 describes a cross-site scripting (XSS) vulnerability in XMB, affecting all versions due to insufficient filtering of BBCode input. This medium-severity flaw (CVSS 6.1) can be exploited remotely with low complexity, requiring user interaction, and could lead to limited confidentiality and integrity impacts. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability. Organizations using XMB are advised to update to versions 1.9.12.03 or 1.9.11.16 to mitigate this risk.

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.9.1, < 1.9.11.16CPE matchmatch criteria
cpe:2.3:a:xmbforum2:xmb:*:*:*:*:*:*:*:*
>= 1.9.11, < 1.9.11.16CPE matchmatch criteria
cpe:2.3:a:xmbforum2:xmb:*:*:*:*:*:*:*:*
>= 1.9.12, < 1.9.12.03CPE matchmatch criteria
cpe:2.3:a:xmbforum2:xmb:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.82%
Probability of exploitation in next 30 days
EPSS Percentile
53.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0082 is in the 62nd percentile among its peer group of 26,236 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

docs.xmbforum2.com / index.php
Vendor Advisory
forums.xmbforum2.com / viewthread.php
PatchVendor Advisory
xmbforum2.com
Vendor Advisory