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Vulnerability record · CVE-2021-24807 · published 8 November 2021

CVE-2021-24807: Schiocco support board cross-site scripting vulnerability

Schiocco · Support Board

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.

5.4 CVSS 3.1 Medium EPSS 1.4% · top 28.3% CWE-79 · Cross-site scripting
5.4CVSS 3.1 base score, v2 3.5
1.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 4 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2025-4828Schiocco support board path traversal vulnerabilityThe Support Board plugin for WordPress is vulnerable to arbitrary file deletion due to insufficient file path validation in the sb_file_delete functi…EPSS 0.83%9.8CVE-2025-4855Schiocco support board insecure direct object reference vulnerabilityThe Support Board plugin for WordPress is vulnerable to unauthorized access/modification/deletion of data due to use of hardcoded default secrets in …EPSS 0.34%8.7CVE-2026-4815Schiocco support board sql injection vulnerabilityA SQL Injection vulnerability has been found in Support Board v3.7.7. This vulnerability allows an attacker to retrieve, create, update and delete da…EPSS 0.43%8.1CVE-2021-24823Schiocco support board cross-site request forgery vulnerabilityThe Support Board WordPress plugin before 3.3.6 does not have any CSRF checks in actions handled by the include/ajax.php file, which could allow atta…EPSS 0.55%4.8CVE-2026-4816Schiocco support board cross-site scripting vulnerabilityA Reflected Cross Site Scripting (XSS) vulnerability has been found in Support Board v3.7.7. This vulnerability allows an attacker to execute JavaScr…EPSS 0.23%6.1CVE-2026-42897Microsoft Exchange Server XSS enables spoofingMicrosoft Exchange Server and Exchange Server Subscription Edition fail to neutralize input during web page generation, a cross-site scripting flaw (…KEVEPSS 0.52%analysed6.1CVE-2025-48700Zimbra Classic UI stored XSS via crafted email HTMLZimbra Collaboration Suite Classic UI fails to properly sanitize HTML content in email messages, allowing crafted tag structures and attribute values…KEVEPSS 1.7%analysed6.1CVE-2025-66376Zimbra Collaboration Classic UI stored XSS via CSS @import in emailZimbra Collaboration Suite 10 before 10.0.18 and 10.1 before 10.1.13 allows stored cross-site scripting in the Classic UI through CSS @import directi…KEVEPSS 20%analysed

Source: NIST National Vulnerability Database (record CVE-2021-24807), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.