What’s Vulnerable › Vulnerabilities

CVE-2021-26036: [20210702] - Core - DoS through usergroup table manipulation

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-07-07 · updated 2026-06-17
• Weakness: CWE-20

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.

Affected products

• Joomla!: from 2.5.0 through 3.9.27

References

• https://developer.joomla.org/security-centre/857-20210702-core-dos-through-usergroup-table-manipulation.html
• https://developer.joomla.org/security-centre/857-20210702-core-dos-through-usergroup-table-manipulation.html

Get alerted when CVE-2021-26036 or the next vulnerability affects your stack