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TI-2021-22571 Aliases CVE-2021-47958GHSA-c329-4cx6-v738

CouchCMS 2.2.1 Server-Side Request Forgery via SVG upload

Priority MEDIUM 57CWE-918Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · Low · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

CouchCMS 2.2.1 contains a server-side request forgery vulnerability that allows authenticated attackers to make arbitrary HTTP requests by uploading malicious SVG files. Attackers can upload SVG files containing external entity references through the browse.php endpoint to access internal services and resources.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00238 14th 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

VendorProductAffected versionsFixed inStatusSource
CouchCMSCouchCMS2.2.1—No fix listedCNA
  • CouchCMS VendorCouchCMS Affected 2.2.1 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-47958
  2. 2026-10-03 Alias added: GHSA-c329-4cx6-v738

References

Exploit 1

Other 1

  • TI-2026-23173 CouchCMS Privilege Escalation via f_k_levels_list Parameter CVSS 4.0HIGH 8.6
  • TI-2025-13688 CouchCMS reCAPTCHA config.example.php hard-coded key CVSS 4.0MEDIUM 6.3
  • TI-2023-22047 An open redirect vulnerability in the sanitize_url() parameter of CouchCMS v2.3 allows… CVSS 3.1MEDIUM 6.1
  • TI-2021-22568 CouchCMS 2.2.1 Cross-Site Scripting via SVG File Upload CVSS 4.0MEDIUM 5.1
  • TI-2018-05521 Couch through 2.0 allows remote attackers to discover the full path via a direct request… CVSS 3.0MEDIUM 5.3
  • TI-2025-41101 ** Disputed ** An Information Disclosure vulnerability in CouchCMS 2.4 allow an Admin… CVSS 3.1MEDIUM 6.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences