7.2

CVE-2021-47855: litespeed technologies openlitespeed Cross-site Scripting

CVSS: 7.2v3.1HighDeferred
Published 21-01-2026Last modified 05-03-2026
Open JSON

Vulnerability summary

CVE-2021-47855 is a high (CVSS 7.2) Cross-site Scripting vulnerability in litespeed technologies openlitespeed. EPSS estimates a 0.28% chance of exploitation in the next 30 days, higher than 19.4% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
39/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.2/10
010
High · v3.1 (CVE.org)
EPSS score
0.28%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1exploit-database

Timeline

  1. 21-01-2026
    PublishedVulnerability first disclosed.
  2. 05-03-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 2 sources · 2 versions

EPSS trend

Probability

0.28%

Chance of exploitation in the next 30 days

Percentile

19%

Versus all other CVEs

30-day change

+0.01 pp

From 0.28% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.28%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • exploit-databasemultipleUnverified

    Openlitespeed 1.7.9 - 'Notes' Stored Cross-Site Scripting

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Litespeed technologies1 product

1 vendor · 1 product

References

3 links