What’s Vulnerable › Vulnerabilities

CVE-2021-26035: [20210701] - Core - XSS in JForm Rules field

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% 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-79

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.

Affected products

• Joomla!: from 3.0.0 through 3.9.27

References

• https://developer.joomla.org/security-centre/856-20210701-core-xss-in-jform-rules-field.html
• https://developer.joomla.org/security-centre/856-20210701-core-xss-in-jform-rules-field.html

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