CVE-2012-6555: Cross-site scripting (XSS) vulnerability in the LatestComment plugin 1.1 for Vanilla Forums allows remote atta

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MEDIUM 4.3DOWNGRADE

CVE-2012-6555 is a medium-severity flaw (CVSS 4.3) affecting latestcomment. 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 LatestComment plugin 1.1 for Vanilla Forums allows remote attackers to inject arbitrary web script or HTML via the discussion title.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	2.1% (top 19%)
CISA exploited list	No
Weakness	CWE-79
Published	2013-05-23
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: vanillaforums

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

Am I affected?

Timeline

2013-05-23 15:55 UTCPublished CVE record published
2026-06-16 23:48 UTCUpdated Record last modified

vanillaforums latestcomment DOWNGRADE

Affected: 1.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.1 (Debian / Ubuntu)

apt-cache madison latestcomment sudo apt install latestcomment=<VERSION_BEFORE_1.1> sudo apt-mark hold latestcomment

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list latestcomment sudo dnf downgrade latestcomment-<VERSION_BEFORE_1.1> sudo dnf versionlock add latestcomment

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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: Vanilla Forums LatestComment 1.1 Plugin - 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-2012-6555?

latestcomment: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2012-6555 being exploited?

CVE-2012-6555 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-2012-6555 affect?

CVE-2012-6555 affects latestcomment. Severity is medium (CVSS 4.3). Cross-site scripting (XSS) vulnerability in the LatestComment plugin 1.1 for Vanilla Forums allows remote attackers to inject arbitrary web script or HTML via the discussion title.

How urgent is CVE-2012-6555?

Priority 40/100. Public exploit reference

References

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