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High, CVSS 7.1

XSS vulnerability on asset view

CVE-2021-27912GHSA-rh5w-82wh-jhr8

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (mautic/core 4.0.0, 3.3.4), redeploy, then verify what is actually installed.

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 mautic/core

    Affected
    < 3.3.4>= 4.0.0-alpha1, < 4.0.0
    Fixed in
    4.0.0, 3.3.4

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.1 · CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
EPSS
  • CVE-2021-27912: 0.60% estimated exploitation activity in the next 30 days; percentile 48.94 (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.

Impact Mautic versions before 3.3.4 / 4.0.0 are vulnerable to an inline JS XSS attack when viewing Mautic assets by utilizing inline JS in the title and adding a broken image URL as a remote asset. This can only be leveraged by an authenticated user with permission to create or edit assets. Patches Upgrade to 3.3.4 or 4.0.0 Workarounds No References https://github.com/mautic/mautic/releases/tag/3.3.4 https://github.com/mautic/mautic/releases/tag/4.0.0 For more information If you have any questions or comments about this advisory: Email us at security@mautic.org

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

    Published from ghsa record GHSA-rh5w-82wh-jhr8

Agent brief

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# Patch Next advisory brief: CVE-2021-27912

Advisory: XSS vulnerability on asset view
IDs: CVE-2021-27912, GHSA-rh5w-82wh-jhr8
Record: https://patchnext.com/advisories/cve-2021-27912 (revision 1, source checked 26 Oct 2026, 14:15 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: mautic/core 4.0.0, 3.3.4. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist mautic/core: affected < 3.3.4; >= 4.0.0-alpha1, < 4.0.0; fixed in 4.0.0, 3.3.4

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

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on mautic/core.
- 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-rh5w-82wh-jhr8 (GitHub-reviewed advisory GHSA-rh5w-82wh-jhr8 lists affected ranges: Packagist mautic/core >=0 =4.0.0-alpha1 <4.0.0)

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