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Medium, CVSS 6.9

HTML Purifier allows remote attackers to obtain sensitive information

CVE-2011-3744GHSA-jw86-5cjf-mv79

What to do

Vendor response not established. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • Packagist ezyang/htmlpurifier

    Affected
    <= 4.2.0
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
6.9 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N · score source
EPSS
  • CVE-2011-3744: 1.37% estimated exploitation activity in the next 30 days; percentile 71.98 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

HTML Purifier 4.2.0 allows remote attackers to obtain sensitive information via a direct request to a .php file, which reveals the installation path in an error message, as demonstrated by tests/PHPT/Reporter/SimpleTest.php and certain other files.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-jw86-5cjf-mv79

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2011-3744

Advisory: HTML Purifier allows remote attackers to obtain sensitive information
IDs: CVE-2011-3744, GHSA-jw86-5cjf-mv79
Record: https://patchnext.com/advisories/cve-2011-3744 (revision 1, source checked 26 Oct 2026, 14:28 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist ezyang/htmlpurifier: affected <= 4.2.0

## Suggested inspection (read-only)
- Packagist ezyang/htmlpurifier: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on ezyang/htmlpurifier.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-jw86-5cjf-mv79 (GitHub-reviewed advisory GHSA-jw86-5cjf-mv79 lists affected ranges: Packagist ezyang/htmlpurifier >=0 <=4.2.0)

Commands are suggestions: review each one before running it.

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