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TI-2021-22568 Aliases CVE-2021-47955GHSA-7q3g-gccm-822q

CouchCMS 2.2.1 Cross-Site Scripting via SVG File Upload

Priority MEDIUM 56CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Active
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

CouchCMS 2.2.1 contains a cross-site scripting vulnerability that allows authenticated attackers to execute arbitrary JavaScript by uploading malicious SVG files through the file upload functionality. Attackers can upload SVG files containing embedded script tags to the browse.php endpoint, which are then executed in users' browsers when the files are accessed or previewed.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00172 6th 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-2021-47955
  2. 2026-10-03 Alias added: GHSA-7q3g-gccm-822q

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-2021-22571 CouchCMS 2.2.1 Server-Side Request Forgery via SVG upload CVSS 4.0MEDIUM 5.3
  • 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