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Not in CISA KEV
HIGH severity

Mautic vulnerable to stored cross-site scripting in description fieldGHSA-2rc5-2755-v422

HIGHFix: mautic/mautic@2d64839

GHSA-2rc5-2755-v422 is a high-severity (CVSS 7.6) CWE-80 vulnerability in mautic/core. A fix is available for mautic/core — see the affected versions and patch details below.

Also known asCVE-2021-27915
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 6, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • A successful exploit gives an attacker total control of the affected component, not partial access.
  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-2rc5-2755-v422.

EPSS Exploitation Probability

via FIRST.org ↗
0.6%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs50th percentile — riskier than 50% of all scored CVEsHighest risk
0.00%0.37%0.75%1.12%0.2%0.6%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐘mautic/core

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

Impact

Prior to the patched version, there is an XSS vulnerability in the description fields within the Mautic application which could be exploited by a logged in user of Mautic with the appropriate permissions.

This could lead to the user having elevated access to the system.

Patches

Update to 4.4.12

Workarounds

None

References

If you have any questions or comments about this advisory:

Email us at [email protected]

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistmautic/core≥ 1.0.0-beta2&&< 4.4.124.4.12composer require mautic/core:^4.4.12

Affected Products

1 product · 9 configurations
Application
mauticacquia
≥ 1.0.0 && < 4.4.12
1 version
1.0.0

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for mautic/core, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update mautic/core to 4.4.12 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-2rc5-2755-v422 is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

### Impact Prior to the patched version, there is an XSS vulnerability in the description fields within the Mautic application which could be exploited by a logged in user of Mautic with the appropriate permissions. This could lead to the user having elevated access to the system. ### Patches Update to 4.4.12 ### Workarounds None ### References - https://owasp.org/www-project-top-ten/2017/A7_2017-Cross-Site_Scripting_(XSS) - https://owasp.org/www-project-web-security-testing-guide/latest/4-Web_Application_Security_Testing/07-Input_Validation_Testing/02-Testing_for_Stored_Cross_Site_Scripti
O3 Security · Impact-Aware SCA

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Mautic vulnerable to stored cross-site scripting in…