CVE-2021-47955

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 v4.0

5.1 MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1

5.4 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS

0.17% chance of exploitation in the next 30 days, 7th percentile

Published

2026-05-16

Updated

2026-05-24

Proof-of-concept exploits (1)

• https://www.exploit-db.com/exploits/49636

References

• CVE Record
• NVD entry

Related

• CVE-2021-47954
• CVE-2021-47956
• CVE-2021-47953
• CVE-2021-47957
• CVE-2021-47952
• CVE-2021-47958