What is CVE-2024-27187?

CVE-2024-27187 is a high-severity vulnerability in Joomla Joomla\!, classified under Improper Access Control. CVSS score: 7.5/10. Published 2024-08-20.

How severe is CVE-2024-27187?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2024-27187 known to be exploited?

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

Vulnerability in Joomla Joomla\!

CVE-2024-27187

Improper Access Controls allows backend users to overwrite their username when disallowed.

Published 2024-08-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (26.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 26.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Joomla Joomla\!
Joomla! Project Cms — versions 4.0.0-4.4.6, 5.0.0-5.1.2

Weakness classification (CWE)

CWE-284 — Improper Access Control

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

developer.joomla.org/security-centre/945-20240804-core-improper-acl-for-backend… (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2024-27187?: CVE-2024-27187 is a high-severity vulnerability in Joomla Joomla\!, classified under Improper Access Control. CVSS score: 7.5/10. Published 2024-08-20.
How severe is CVE-2024-27187?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2024-27187 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.