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CVE-2011-5106

36
FAUCET Score

CVE-2011-5106 describes a Cross-site Scripting (XSS) vulnerability in the Flexible Custom Post Type plugin for WordPress, specifically affecting versions prior to 0.1.7. An unauthenticated remote attacker can inject arbitrary web script or HTML via the 'id' parameter in edit-post.php. This vulnerability has a CVSS score of 4.3, indicating a medium severity, and could lead to information disclosure or defacement. While not listed in CISA's KEV catalog, public exploit code and Nuclei templates exist, suggesting potential for exploitation, though there is no evidence of active widespread exploitation or significant community discussion.

Impacted Technologies

VendorProductVersion(s)CPE
0.1CPE matchmatch criteria
cpe:2.3:a:fractalia:flexible_custom_post_type:0.1:*:*:*:*:*:*:*
0.1.3CPE matchmatch criteria
cpe:2.3:a:fractalia:flexible_custom_post_type:0.1.3:*:*:*:*:*:*:*
0.1.4CPE matchmatch criteria
cpe:2.3:a:fractalia:flexible_custom_post_type:0.1.4:*:*:*:*:*:*:*
0.1.5CPE matchmatch criteria
cpe:2.3:a:fractalia:flexible_custom_post_type:0.1.5:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

4.3MEDIUM

AV:N/AC:M/Au:N/C:N/I:P/A:N

Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
10.90%
Probability of exploitation in next 30 days
EPSS Percentile
95.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
Nuclei: CVE-2011-5106 · Jul 11, 2021
ExploitDB: EDB-36317 · Nov 17, 2011
This CVE's current EPSS score of 0.1090 is in the 95th percentile among its peer group of 19,954 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

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

Remediation

Remediation records are not available for this CVE.

References

plugins.trac.wordpress.org / changeset
ExploitPatch
exchange.xforce.ibmcloud.com / vulnerabilities/71415
wordpress.org / extend/plugins/flexible-custom-post-type/changelog
Vendor Advisory
securityfocus.com / archive/1/520542/100/0/threaded
securityfocus.com / bid/50719
Exploit