What is CVE-2021-27915?

CVE-2021-27915 is a high-severity vulnerability in Acquia Mautic, classified under Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS). CVSS score: 7.6/10. Published 2024-09-17.

How severe is CVE-2021-27915?

High severity. CVSS v3 base score is 7.6 out of 10.

Is CVE-2021-27915 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Acquia Mautic

CVE-2021-27915

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.

Published 2024-09-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L.

EPSS exploit prediction

EPSS: 0.006 (47.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Acquia Mautic — versions 1.0.0
Mautic — versions >= 1.0.0-beta2

Weakness classification (CWE)

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

github.com/mautic/mautic/security/advisories/GHSA-2rc5-2755-v422 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-27915?: CVE-2021-27915 is a high-severity vulnerability in Acquia Mautic, classified under Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS). CVSS score: 7.6/10. Published 2024-09-17.
How severe is CVE-2021-27915?: High severity. CVSS v3 base score is 7.6 out of 10.
Is CVE-2021-27915 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.