Stored XSS in MassEditRegex
Priority LOW 25CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · Low
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. 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 Wikimedia Foundation Mediawiki - MassEditRegex Extension allows Stored XSS.This issue affects Mediawiki - MassEditRegex Extension: from 1.39.X before 1.39.12, from 1.42.X before 1.42.7, from 1.43.X before 1.43.2.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00276 20th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed Mediawiki - MassEditRegex Extension (Wikimedia Foundation): 1.39.13, 1.42.7, 1.43.2
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- 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 - MassEditRegex Extension | 1.39.x to before 1.39.13; 1.42.x to before 1.42.7; 1.43.x to before 1.43.2 | 1.39.13, 1.42.7, 1.43.2 | Patch available | CNA |
- Mediawiki - MassEditRegex Extension VendorWikimedia Foundation Affected 1.39.x to before 1.39.13; 1.42.x to before 1.42.7; 1.43.x to before 1.43.2 Fixed in 1.39.13, 1.42.7, 1.43.2 Patch available CNA
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:malvineous:masseditregex:-:*:*:*:*:mediawiki:*:* | not specified by NVD | Vulnerable | Malvineous |
| cpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:* | 1.39.0 to before 1.39.12; 1.42.0 to before 1.42.7; 1.43.0 to before 1.43.2 | Running on | mediawiki |
- cpe:2.3:a:malvineous:masseditregex:-:*:*:*:*:mediawiki:*:* Versions not specified by NVD Vulnerable ·Malvineous
- cpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:* Versions 1.39.0 to before 1.39.12; 1.42.0 to before 1.42.7; 1.43.0 to before 1.43.2 Running on ·mediawiki
Remediation
- Fix · CNA Mediawiki - MassEditRegex Extension (Wikimedia Foundation) Fixed in 1.39.13, 1.42.7, 1.43.2
Timeline
- 2026-10-02 Threatist record created from CVE-2025-53500
- 2026-10-03 Alias added: GHSA-4jh6-6j22-8j58
References
More Wikimedia Foundation vulnerabilities
- TI-2025-11006 The compare API module breaks Extension:Lockdown CVSS 4.0CRITICAL 10.0
- TI-2024-32110 Backticks can allow the usage of not-allowed SQL functions CVSS 4.0HIGH 8.8
- TI-2026-65500 Unauthenticated SQL injection in UserPageViewTracker via filterusers and ignoreusers parameters CVSS 3.1HIGH 7.5
- TI-2026-64588 DataTransfer depends on phpspreadsheet version vulnerable to CVE-2026-59933 (XLS/OLE memory exhaustion) CVSS 3.1HIGH 7.5
- TI-2026-42112 SQLi in Cargo extension via year range filter CVSS 4.0MEDIUM 6.9
- TI-2026-42110 Stored XSS through Cargo's map format CVSS 4.0MEDIUM 6.9
Sources
- CVE-2025-53500 · CVE Program
- CVE-2025-53500 · NVD
- FIRST EPSS
- GHSA-4jh6-6j22-8j58 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences