CVE-2021-47855 Openlitespeed 1.7.9 - 'Notes' Stored Cross-Site Scripting
Administrators can inject malicious scripts via the Notes field in OpenLiteSpeed, leading to code execution when viewed by other admins.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-47855?
CVE-2021-47855 is a medium-severity cross-site scripting vulnerability in OpenLiteSpeed, published on 21 Jan 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
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.
Weakness: CWE-79
Which versions are affected by CVE-2021-47855?
How do I fix CVE-2021-47855?
No fix has been published for CVE-2021-47855 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2021-47855 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47855 exists.
Sources
Also known as GHSA-cxv4-2vr2-784m.