XSS in Litespeed Technologies Openlitespeed
CVE-2021-47855
Openlitespeed 1.7.9 contains a stored cross-site scripting vulnerability in the dashboard's Notes parameter that allows administrators to inject malicious scripts. Attackers can craft a payload in the Notes field during listener configuration that will execute when an administrator clicks on the Default Icon.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (18.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 18th percentile — 18.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.000
Affected products
- Litespeed Technologies Openlitespeed — versions 1.7.9
Weakness classification (CWE)
References
- www.exploit-db.com/exploits/49727 (exploit)
- openlitespeed.org/ (product)
- www.vulncheck.com/advisories/openlitespeed-notes-stored-cross-site-scripting (third-party-advisory)
Frequently asked questions
- What is CVE-2021-47855?
- CVE-2021-47855 is a high-severity vulnerability in Litespeed Technologies Openlitespeed, classified under Cross-site Scripting. CVSS score: 7.2/10. Published 2026-01-21.
- How severe is CVE-2021-47855?
- High severity. CVSS v3 base score is 7.2 out of 10.