6.1

CVE-2021-26035: joomla! project joomla! cms Cross-site Scripting

CVSS: 6.1v3.1MediumModified
Published 07-07-2021Last modified 25-02-2026
Open JSON

Vulnerability summary

CVE-2021-26035 is a medium (CVSS 6.1) Cross-site Scripting vulnerability in joomla! project joomla! cms. EPSS estimates a 0.72% chance of exploitation in the next 30 days, higher than 53.4% of scored vulnerabilities.

Overall risk
25/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.1/10
010
Medium · v3.1 (NVD)
EPSS score
0.72%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 07-07-2021
    PublishedVulnerability first disclosed.
  2. 25-02-2026
    Last modifiedVulnerability information updated.

Description

An issue was discovered in Joomla! 3.0.0 through 3.9.27. Inadequate escaping in the rules field of the JForm API leads to a XSS vulnerability.

CVSS metrics

2 scores · 1 source · 2 versions

EPSS trend

Probability

0.72%

Chance of exploitation in the next 30 days

Percentile

53%

Versus all other CVEs

30-day change

0.00 pp

From 0.72% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.72%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Joomla1 product
Joomla! project1 product

2 vendors · 2 products

References

1 links