7.5

CVE-2021-26036: joomla! project joomla! cms Improper Input Validation

CVSS: 7.5v3.1HighModified
Published 07-07-2021Last modified 25-02-2026
Open JSON

Vulnerability summary

CVE-2021-26036 is a high (CVSS 7.5) Improper Input Validation vulnerability in joomla! project joomla! cms. EPSS estimates a 1.22% chance of exploitation in the next 30 days, higher than 68.5% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
1.22%
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! 2.5.0 through 3.9.27. Missing validation of input could lead to a broken usergroups table.

CVSS metrics

2 scores · 1 source · 2 versions

EPSS trend

Probability

1.22%

Chance of exploitation in the next 30 days

Percentile

69%

Versus all other CVEs

30-day change

0.00 pp

From 1.22% on 21-09-2026

21-09-202621-10-2026
EPSS score
1.22%

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