Vulnerability · Published Jan 21, 2026 · Assigned by VulnCheck
CVE-2021-47855Openlitespeed 1.7.9 - 'Notes' Stored Cross-Site Scripting
High 7.2
In plain English
A high-severity cross-site scripting in OpenLiteSpeed from LiteSpeed Technologies. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities).
Severity (CVSS 3.1)7.2High
Exploit odds (30 days)0.3%top 79.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| LiteSpeed Technologies | OpenLiteSpeed | 1.7.9 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
References
- ExploitDB-49727 exploit
- OpenLiteSpeed Vendor Homepage product
- VulnCheck Advisory: Openlitespeed 1.7.9 - 'Notes' Stored Cross-Site Scripting third-party-advisory