Stored XSS through sidebar in Apex skin
Priority HIGH 70CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0033 26th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed Mediawiki - Apex skin (The Wikimedia Foundation): 1.39.9, 1.41.3, 1.42.2
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Wikimedia Foundation | Mediawiki - Apex skin | 1.39.x to before 1.39.9; 1.41.x to before 1.41.3; 1.42.x to before 1.42.2 | 1.39.9, 1.41.3, 1.42.2 | Patch available | CNA |
- Mediawiki - Apex skin VendorWikimedia Foundation Affected 1.39.x to before 1.39.9; 1.41.x to before 1.41.3; 1.42.x to before 1.42.2 Fixed in 1.39.9, 1.41.3, 1.42.2 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:wikimedia:apex:*:*:*:*:*:*:*:* | 1.13.0 to before 1.39.9; 1.41.0 to before 1.41.3; 1.42.0 to before 1.42.2 | Vulnerable | Wikimedia Foundation |
- cpe:2.3:a:wikimedia:apex:*:*:*:*:*:*:*:* Versions 1.13.0 to before 1.39.9; 1.41.0 to before 1.41.3; 1.42.0 to before 1.42.2 Vulnerable ·Wikimedia Foundation
Remediation
- Fix · CNA Mediawiki - Apex skin (The Wikimedia Foundation) Fixed in 1.39.9, 1.41.3, 1.42.2
Timeline
- 2026-10-02 Threatist record created from CVE-2024-47840
- 2026-10-03 Alias added: GHSA-mmf2-8r78-pm42
References
Sources
- CVE-2024-47840 · CVE Program
- CVE-2024-47840 · NVD
- FIRST EPSS
- GHSA-mmf2-8r78-pm42 · GitHub Advisory Database · CC BY 4.0
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