An issue was discovered in MediaWiki before 1.35.5, 1.36.x before 1.36.3, and 1.37.x…
Priority MEDIUM 58CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Will not fix Red Hat: no fix planned
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-79.
Summary
An issue was discovered in MediaWiki before 1.35.5, 1.36.x before 1.36.3, and 1.37.x before 1.37.1. There is Blind Stored XSS via a URL to the Upload Image feature.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00589 48th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Will not fix Red Hat: no fix planned
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- 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 |
|---|---|---|---|---|---|
| — | — | — | — | No fix listed | CNA |
- — Vendor— Affected — Fixed in — No fix listed CNA
CPE configurations NVD · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:* | before 1.35.5; 1.36.0 to before 1.36.3 | Vulnerable | mediawiki |
| cpe:2.3:a:mediawiki:mediawiki:1.37.0:-:*:*:*:*:*:* | 1.37.0 | Vulnerable | mediawiki |
| cpe:2.3:a:mediawiki:mediawiki:1.37.0:rc0:*:*:*:*:*:* | 1.37.0 rc0 | Vulnerable | mediawiki |
| cpe:2.3:a:mediawiki:mediawiki:1.37.0:rc1:*:*:*:*:*:* | 1.37.0 rc1 | Vulnerable | mediawiki |
| cpe:2.3:a:mediawiki:mediawiki:1.37.0:rc2:*:*:*:*:*:* | 1.37.0 rc2 | Vulnerable | mediawiki |
- cpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:* Versions before 1.35.5; 1.36.0 to before 1.36.3 Vulnerable ·mediawiki
- cpe:2.3:a:mediawiki:mediawiki:1.37.0:-:*:*:*:*:*:* Versions 1.37.0 Vulnerable ·mediawiki
- cpe:2.3:a:mediawiki:mediawiki:1.37.0:rc0:*:*:*:*:*:* Versions 1.37.0 rc0 Vulnerable ·mediawiki
- cpe:2.3:a:mediawiki:mediawiki:1.37.0:rc1:*:*:*:*:*:* Versions 1.37.0 rc1 Vulnerable ·mediawiki
- cpe:2.3:a:mediawiki:mediawiki:1.37.0:rc2:*:*:*:*:*:* Versions 1.37.0 rc2 Vulnerable ·mediawiki
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat OpenShift Container Platform 3.11 | Affected | No fix planned: Out of support scope |
Timeline
- 2026-10-02 Threatist record created from CVE-2021-44855
- 2026-10-03 Alias added: GHSA-3cqw-cf93-mf47
References
More Mediawiki vulnerabilities
- TI-2023-18933 An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3. CVSS 3.1CRITICAL 9.8
- TI-2023-13576 An issue was discovered in MediaWiki before 1.35.10, 1.36.x through 1.38.x before 1.38.6… CVSS 3.1CRITICAL 9.8
- TI-2023-03312 Stored XSS leads to privilege escalation in MediaWiki v1.40.0 CVSS 3.1CRITICAL 9.0
- TI-2026-42109 Cross-site request forgery in Wikimedia Foundation Mediawiki - RedirectManager Extension CVSS 4.0MEDIUM 6.9
- TI-2024-22822 An issue was discovered in includes/CommentFormatter/CommentParser.php in MediaWiki… CVSS 3.1HIGH 7.4
- TI-2023-18935 An issue was discovered in the ProofreadPage (aka Proofread Page) extension for MediaWiki… CVSS 3.1MEDIUM 5.3
Sources
- CVE-2021-44855 · CVE Program
- CVE-2021-44855 · NVD
- FIRST EPSS
- GHSA-3cqw-cf93-mf47 · GitHub Advisory Database · CC BY 4.0
- CVE-2021-44855 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences