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CVE-2009-1030

22
FAUCET Score

CVE-2009-1030 describes a Cross-Site Scripting (XSS) vulnerability in the choose_primary_blog function within wp-includes/wpmu-functions.php of WordPress MU (WPMU) versions prior to 2.7. This flaw allows remote attackers to inject arbitrary web script or HTML by manipulating the HTTP Host header. With a CVSS score of 4.3 (Medium), the vulnerability has a network attack vector, medium attack complexity, and a potential impact of partial information disclosure. While not listed on the KEV catalog or Hot List, exploit code is publicly available via ExploitDB, though there is no evidence of active exploitation, Metasploit modules, or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.6CPE matchmatch criteria
cpe:2.3:a:wordpress:wordpress_mu:*:*:*:*:*:*:*:*
1.0CPE matchmatch criteria
cpe:2.3:a:wordpress:wordpress_mu:1.0:*:*:*:*:*:*:*
1.0CPE matchmatch criteria
cpe:2.3:a:wordpress:wordpress_mu:1.0:rc1:*:*:*:*:*:*
1.0CPE matchmatch criteria
cpe:2.3:a:wordpress:wordpress_mu:1.0:rc2:*:*:*:*:*:*
1.0CPE matchmatch criteria
cpe:2.3:a:wordpress:wordpress_mu:1.0:rc3:*:*:*:*:*:*

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
4.66%
Probability of exploitation in next 30 days
EPSS Percentile
90.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
ExploitDB: EDB-8196 · Mar 10, 2009
This CVE's current EPSS score of 0.0466 is in the 88th percentile among its peer group of 19,955 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, 0.0 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

Vendor Advisories (1)

redhatCVE-2009-1030Moderate

wordpress-mu: XSS vulnerability in helper function for WPMU

Dec 3, 2008

References

marc.info
exchange.xforce.ibmcloud.com / vulnerabilities/49184
exploit-db.com / exploits/8196
securityfocus.com / archive/1/501667/100/0/threaded
securityfocus.com / bid/34075
securitytracker.com / id