CVE-2011-1009: Vanilla Forums 2.0.17.1 through 2.0.17.5 has XSS in /vanilla/index.php via the p parameter.

This month

MEDIUM 6.1UPGRADE

CVE-2011-1009 is a medium-severity flaw (CVSS 6.1) affecting vanilla. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Vanilla Forums 2.0.17.1 through 2.0.17.5 has XSS in /vanilla/index.php via the p parameter.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.8% (top 43%)
CISA exploited list	No
Weakness	CWE-79
Published	2020-02-05
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · Vendor: vanillaforums

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

Am I affected?

Timeline

2020-02-05 21:15 UTCPublished CVE record published
2026-06-16 23:28 UTCUpdated Record last modified

vanillaforums vanilla UPGRADE

Affected: >= 2.0.17.1 and <= 2.0.17.5

Fixed in: newer than 2.0.17.5

Safe to downgrade to: a release before 2.0.17.1

1. Check installed version

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

2. UPGRADE to newer than 2.0.17.5 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade vanilla

Note

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

3. If no update is available yet, DOWNGRADE to a release before 2.0.17.1 (Debian / Ubuntu)

apt-cache madison vanilla sudo apt install vanilla=<VERSION_BEFORE_2.0.17.1> sudo apt-mark hold vanilla

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list vanilla sudo dnf downgrade vanilla-<VERSION_BEFORE_2.0.17.1> sudo dnf versionlock add vanilla

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.

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-2011-1009?

vanilla: upgrade to newer than 2.0.17.5. Exact commands for each OS are on this page.

Is CVE-2011-1009 being exploited?

CVE-2011-1009 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-2011-1009 affect?

CVE-2011-1009 affects vanilla. Severity is medium (CVSS 6.1). Vanilla Forums 2.0.17.1 through 2.0.17.5 has XSS in /vanilla/index.php via the p parameter.

How urgent is CVE-2011-1009?

Priority 41/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2020-8825 MEDIUM 5.4 DOWNGRADE index.php?p=/dashboard/settings/branding in Vanilla 2.6.3 allows stored XSS.
CVE-2019-9889 LOW 2.7 UPGRADE In Vanilla before 2.6.4, a flaw exists within the getSingleIndex function of the AddonManager class
CVE-2018-19499 HIGH 7.2 UPGRADE Vanilla before 2.5.5 and 2.6.x before 2.6.2 allows Remote Code Execution because authenticated administrators
CVE-2018-18903 CRITICAL 9.8 UPGRADE Vanilla 2.6.x before 2.6.4 allows remote code execution.
CVE-2018-17571 MEDIUM 6.1 UPGRADE Vanilla before 2.6.1 allows XSS via the email field of a profile.

References

← Back to latest CVEs