What is CVE-2024-47840?

CVE-2024-47840 is a medium-severity vulnerability in The Wikimedia Foundation MediaWiki - Apex Skin, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2024-10-05.

How severe is CVE-2024-47840?

Medium severity. CVSS v3 base score is 4.8 out of 10.

XSS in The Wikimedia Foundation MediaWiki - Apex Skin

CVE-2024-47840

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in The Wikimedia Foundation Mediawiki - Apex skin allows Stored XSS.This issue affects Mediawiki - Apex skin: from 1.39.X before 1.39.9, from 1.41.X before 1.41.3, from 1.42.X before 1.42.2.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2024-10-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (23.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 24th percentile — 23.6% 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

The Wikimedia Foundation MediaWiki - Apex Skin — versions 1.39.x, 1.41.x, 1.42.x
Wikimedia Apex

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

c4f26cc8-17ff-4c99-b5e2-38fc1793eacc (Issue Tracking, Vendor Advisory)
c4f26cc8-17ff-4c99-b5e2-38fc1793eacc (Exploit, Issue Tracking, Vendor Advisory)
c4f26cc8-17ff-4c99-b5e2-38fc1793eacc (Patch)

Frequently asked questions

What is CVE-2024-47840?: CVE-2024-47840 is a medium-severity vulnerability in The Wikimedia Foundation MediaWiki - Apex Skin, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2024-10-05.
How severe is CVE-2024-47840?: Medium severity. CVSS v3 base score is 4.8 out of 10.