CVE-2021-47955

CouchCMS 2.2.1 Cross-Site Scripting via SVG File Upload

CVSS 5.1 MEDIUMEPSS 0.2%CWE-79

Vexday Risk Score

33Attention

SSVC decision (CISA)

Attend

PoC available → attend closely

CVSS 5.1EPSS 0.2%KEV nãoPoC públicaNuclei —Metasploit —Patch —

Lifecycle

16 May 2026Published on NVD

Recommendation: Plan a near-term fix — a public PoC already exists.

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Affected products

CouchCMS · CouchCMS

public PoCs found — 1

cve_referencewww.exploit-db.com/exploits/49636unverified

⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.

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References

https://github.com/CouchCMS/CouchCMS https://www.exploit-db.com/exploits/49636 https://www.vulncheck.com/advisories/couchcms-cross-site-scripting-via-svg-file-upload