What is CVE-2021-27917?

CVE-2021-27917 is a high-severity vulnerability in Acquia Mautic, classified under Cross-site Scripting. CVSS score: 7.3/10. Published 2024-09-18.

How severe is CVE-2021-27917?

High severity. CVSS v3 base score is 7.3 out of 10.

XSS in Acquia Mautic

CVE-2021-27917

Prior to this patch, a stored XSS vulnerability existed in the contact tracking and page hits report.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2024-09-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.003 (19.5th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 19.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Acquia Mautic — versions 1.0.0
Mautic — versions >= 1.0.0-beta4, >= 5.0.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/mautic/mautic/security/advisories/GHSA-xpc5-rr39-v8v2 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-27917?: CVE-2021-27917 is a high-severity vulnerability in Acquia Mautic, classified under Cross-site Scripting. CVSS score: 7.3/10. Published 2024-09-18.
How severe is CVE-2021-27917?: High severity. CVSS v3 base score is 7.3 out of 10.