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CVE-2013-4338

22
FAUCET Score

CVE-2013-4338 is a critical vulnerability affecting WordPress versions prior to 3.6.1, specifically within the wp-includes/functions.php file. It allows remote attackers to execute arbitrary code by manipulating PHP unserialize operations due to improper serialization checks. With a CVSS score of 7.5, this vulnerability is highly severe, requiring no authentication and having low attack complexity, potentially leading to full compromise of confidentiality, integrity, and availability. Despite its severity, there is no evidence of active exploitation, no known public exploit code (Metasploit, Nuclei, ExploitDB), and minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 3.6CPE matchmatch criteria
cpe:2.3:a:wordpress:wordpress:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

7.5HIGH

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

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
6.4
CvssVersion
2.0

Exploit Intelligence

EPSS Score
8.75%
Probability of exploitation in next 30 days
EPSS Percentile
94.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0875 is in the 91st percentile among its peer group of 51,553 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 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

codex.wordpress.org / Version_3.6.1
Vendor Advisory
core.trac.wordpress.org / changeset/25325
ExploitPatch
lists.fedoraproject.org / pipermail/package-announce/2013-September/116828.html
lists.fedoraproject.org / pipermail/package-announce/2013-September/116832.html
lists.fedoraproject.org / pipermail/package-announce/2013-September/117118.html
wordpress.org / news/2013/09/wordpress-3-6-1
PatchVendor Advisory
debian.org / security/2013/dsa-2757