CMS Made Simple 2.2.15 Stored XSS via SVG File Upload
Priority MEDIUM 56CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Passive
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- None · None · None
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
CMS Made Simple 2.2.15 contains a stored cross-site scripting vulnerability that allows authenticated users with Content Manager access to inject malicious scripts through SVG file uploads. Attackers can upload SVG files containing embedded JavaScript to the file manager, which executes when other authenticated users access the uploaded file, enabling cookie theft and session hijacking.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00243 15th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix No fix listed No fixed version in the sources yet
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 |
|---|---|---|---|---|---|
| Cmsmadesimple | CMS Made Simple | 2.2.15 | — | No fix listed | CNA |
- CMS Made Simple VendorCmsmadesimple Affected 2.2.15 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2020-37238
- 2026-10-03 Alias added: GHSA-r549-hx7w-7xr9
References
Exploit 1
More Cmsmadesimple vulnerabilities
- TI-2023-18726 CMS Made Simple v2.2.17 is vulnerable to Remote Command Execution via the File Upload Function. CVSS 3.1HIGH 8.8
- TI-2019-06534 An issue was discovered in CMS Made Simple 2.2.8. CVSS 3.0HIGH 8.1
- TI-2023-23207 An issue in CMSmadesimple v.2.2.18 allows a local attacker to execute arbitrary code via… CVSS 3.1HIGH 7.8
- TI-2025-39411 An authenticated arbitrary file upload vulnerability in the /uploads/ endpoint of CMS… CVSS 3.1HIGH 7.2
- TI-2024-18325 A remote code execution vulnerability has been identified in the User Defined Tags module… CVSS 3.1HIGH 7.2
- TI-2021-09905 File upload vulnerability in CMS Made Simple through 2.2.15 allows remote authenticated… CVSS 3.1HIGH 7.2
Sources
- CVE-2020-37238 · CVE Program
- CVE-2020-37238 · NVD
- FIRST EPSS
- GHSA-r549-hx7w-7xr9 · 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