CVE-2011-3854: Cross-site scripting (XSS) vulnerability in the ZenLite theme before 4.4 for WordPress allows remote attackers

Q: How do I fix CVE-2011-3854?

zenlite: upgrade to newer than 4.3. Exact commands for each OS are on this page.

Q: Is CVE-2011-3854 being exploited?

CVE-2011-3854 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-2011-3854 affect?

CVE-2011-3854 affects zenlite. Severity is medium (CVSS 4.3). Cross-site scripting (XSS) vulnerability in the ZenLite theme before 4.4 for WordPress allows remote attackers to inject arbitrary web script or HTML via the s parameter.

Q: How urgent is CVE-2011-3854?

Priority 39/100. Public exploit reference

Routine

MEDIUM 4.3UPGRADE

CVE-2011-3854 is a medium-severity flaw (CVSS 4.3) affecting zenlite. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting (XSS) vulnerability in the ZenLite theme before 4.4 for WordPress allows remote attackers to inject arbitrary web script or HTML via the s parameter.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	1.5% (top 25%)
CISA exploited list	No
Weakness	CWE-79
Published	2011-09-28
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: quirm

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

Am I affected?

Timeline

2011-09-28 10:55 UTCPublished CVE record published
2026-06-16 23:34 UTCUpdated Record last modified

quirm zenlite UPGRADE

Affected: <= 4.3 · 1.0 · 1.1 · 1.2 · 1.3 · 2.0 · 2.1 · 2.2

Fixed in: newer than 4.3

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 4.3 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade zenlite

Note

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

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-2011-3854?

zenlite: upgrade to newer than 4.3. Exact commands for each OS are on this page.

Is CVE-2011-3854 being exploited?

CVE-2011-3854 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-2011-3854 affect?

CVE-2011-3854 affects zenlite. Severity is medium (CVSS 4.3). Cross-site scripting (XSS) vulnerability in the ZenLite theme before 4.4 for WordPress allows remote attackers to inject arbitrary web script or HTML via the s parameter.

How urgent is CVE-2011-3854?

Priority 39/100. Public exploit reference

Software pages

WordPress vulnerabilities

References

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