CVE-2021-47855CWE-79

Openlitespeed 1.7.9 - 'Notes' Stored Cross-Site Scripting

Medium · published January 21, 2026

CVSS v4.0
5.1
EPSS
0%
Percentile
19.7
In the wild
Unconfirmed
What it is

⚠️ A simple note could turn into a sneaky script! OpenLiteSpeed 1.7.9 has a stored XSS vulnerability lurking in the dashboard's Notes parameter. 😱 Think of it like allowing patrons to write messages on the restaurant's menu — if someone sneaks in a prank recipe, it could cause chaos when the staff serves it without checking! An attacker can inject malicious scripts that execute when an unsuspecting admin clicks on the Default Icon, potentially compromising sensitive data or the server itself. This could result in unauthorized access to the dashboard, making it an unexpected rollercoaster ride for your server security!

Put simply

Think of it like allowing patrons to write messages on the restaurant's menu — if someone sneaks in a prank recipe, it could cause chaos when the staff serves it without checking! This vulnerability allows an attacker to exploit the Notes field in the dashboard configuration by injecting malicious scripts that are stored and executed later when the Default Icon is clicked. Essentially, the admin's trust is leveraged to run harmful scripts.

What to do

An attacker can inject malicious scripts that execute when an unsuspecting admin clicks on the Default Icon, potentially compromising sensitive data or the server itself. This could result in unauthorized access to the dashboard, making it an unexpected rollercoaster ride for your server security! Upgrade to OpenLiteSpeed version 1.7.10 or later to close this vulnerability. Additionally, ensure that proper input validation is in place for configuration fields to mitigate future risks. It's a great time to review your overall security posture too! You’ve got this! With a quick upgrade, you’ll sweep this vulnerability under the rug and keep your server secure. 🛡️

The record
Technical detail
CVSS v4.0
5.1 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
EPSS
0.00283 · 19.7th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-01-21T17:27Z
EPSS history
Timeline
  • 21 JAN 17:27Z
    Openlitespeed 1.7.9 - 'Notes' Stored Cross-Site Scripting
    cvelistv5