CVE-2011-5257: Multiple cross-site scripting (XSS) vulnerabilities in the Classipress theme before 3.1.5 for WordPress allow

Q: How do I fix CVE-2011-5257?

classipress: upgrade to newer than 3.1.4. Exact commands for each OS are on this page.

Q: Is CVE-2011-5257 being exploited?

CVE-2011-5257 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2011-5257 affect?

CVE-2011-5257 affects classipress. Severity is medium (CVSS 4.3). Multiple cross-site scripting (XSS) vulnerabilities in the Classipress theme before 3.1.5 for WordPress allow remote attackers to inject arbitrary web script or HTML via the (1) twitter_id parameter related to the Twitter widget and (2) fac

Q: How urgent is CVE-2011-5257?

Priority 43/100. Public exploit reference

This month

MEDIUM 4.3UPGRADE

CVE-2011-5257 is a medium-severity flaw (CVSS 4.3) affecting classipress. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple cross-site scripting (XSS) vulnerabilities in the Classipress theme before 3.1.5 for WordPress allow remote attackers to inject arbitrary web script or HTML via the (1) twitter_id parameter related to the Twitter widget and (2) facebook_id parameter related to the Facebook widget.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	3.8% (top 10%)
CISA exploited list	No
Weakness	CWE-79
Published	2013-02-12
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: appthemes

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2013-02-12 20:55 UTCPublished CVE record published
2026-06-16 23:36 UTCUpdated Record last modified

appthemes classipress UPGRADE

Affected: <= 3.1.4 · 3.0.5.2 · 3.0.5.3 · 3.1.3 · 3.1.5

Fixed in: newer than 3.1.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy classipress || rpm -q classipress || classipress --version

2. UPGRADE to newer than 3.1.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade classipress

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade classipress

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: WordPress Theme classipress 3.1.4 - Persistent Cross-Site Scripting

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2011-5257?

classipress: upgrade to newer than 3.1.4. Exact commands for each OS are on this page.

Is CVE-2011-5257 being exploited?

CVE-2011-5257 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2011-5257 affect?

CVE-2011-5257 affects classipress. Severity is medium (CVSS 4.3). Multiple cross-site scripting (XSS) vulnerabilities in the Classipress theme before 3.1.5 for WordPress allow remote attackers to inject arbitrary web script or HTML via the (1) twitter_id parameter related to the Twitter widget and (2) fac

How urgent is CVE-2011-5257?

Priority 43/100. Public exploit reference

Software pages

WordPress vulnerabilities

References

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