6.1

CVE-2021-26030: joomla! project joomla! cms Cross-site Scripting

CVSS: 6.1v3.1MediumModified
Published 14-04-2021Last modified 25-02-2026
Open JSON

Vulnerability summary

CVE-2021-26030 is a medium (CVSS 6.1) Cross-site Scripting vulnerability in joomla! project joomla! cms. EPSS estimates a 82.26% chance of exploitation in the next 30 days, higher than 99.6% of scored vulnerabilities.

Overall risk
41/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.1/10
010
Medium · v3.1 (NVD)
EPSS score
82.26%
0%100%
Critical · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 14-04-2021
    PublishedVulnerability first disclosed.
  2. 25-02-2026
    Last modifiedVulnerability information updated.

Description

An issue was discovered in Joomla! 3.0.0 through 3.9.25. Inadequate escaping allowed XSS attacks using the logo parameter of the default templates on error page

CVSS metrics

2 scores · 1 source · 2 versions

EPSS trend

Probability

82.26%

Chance of exploitation in the next 30 days

Percentile

100%

Versus all other CVEs

30-day change

0.00 pp

From 82.26% on 21-09-2026

21-09-202621-10-2026
EPSS score
82.26%

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