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CVE-2021-24807

MediumPublished

Support Board < 3.3.5 - Agent+ Stored Cross-Site Scripting

Published: Nov 8, 2021
Updated: Aug 3, 2024
Assigning CNA: WPScan
Evidence observed: Aug 8, 2026

Primary CVSS

5.4/ 10Medium

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS probability estimate

1.4%

Low · next 30 days

Percentile: 71.2%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2021-24807PoC
Support Board 3.3.4 Authenticated Stored XSS

Responsible use

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