What’s Vulnerable › Vulnerabilities

CVE-2021-24807: Support Board < 3.3.5 - Agent+ Stored Cross-Site Scripting

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-11-08 · updated 2026-06-17
• Weakness: CWE-79

Description

The Support Board WordPress plugin before 3.3.5 allows Authenticated (Agent+) users to perform Cross-Site Scripting attacks by placing a payload in the notes field, when an administrator or any authenticated user go to the chat the XSS will be automatically executed.

Affected products

• Schiocco Support Board: before 3.3.5 — fixed in 3.3.5

How to fix

Upgrade to a fixed version: Schiocco Support Board 3.3.5. Check the vendor advisory for mitigations.

References

• https://github.com/itsjeffersonli/CVE-2021-24807
• https://medium.com/%40lijohnjefferson/cve-2021-24807-6bc22af2a444
• https://wpscan.com/vulnerability/19d101aa-4b60-4db4-a33b-86c826b288b0
• https://github.com/itsjeffersonli/CVE-2021-24807
• https://medium.com/%40lijohnjefferson/cve-2021-24807-6bc22af2a444
• https://wpscan.com/vulnerability/19d101aa-4b60-4db4-a33b-86c826b288b0

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