CVE-2026-107751 kitae-park CVE debrief

Who should care

Defenders responsible for WordPress installations with the Mang Board plugin should assess exposure and prioritize verification and updates. This includes operators, platform administrators, vulnerability management teams, and security teams who need to verify and update Mang Board installations to prevent potential XSS attacks.

Why it matters

The Mang Board plugin vulnerability allows unauthenticated attackers to inject arbitrary web scripts, potentially leading to XSS attacks on affected WordPress installations.

• Potential for unauthenticated attackers to inject arbitrary web scripts
• Possible execution of injected scripts when users access affected pages
• Need for defenders to verify and update Mang Board installations
• Potential for XSS attacks on affected installations

Technical summary

The Mang Board plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'user_name' parameter in all versions up to, and including, 2.4.3 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The vulnerability exists because the save-time sanitizer mbw_htmlspecialchars2() is ineffective against this vector, as the exploit payload relies solely on unquoted HTML attribute syntax using only spaces, alphanumerics, and characters such as =, parentheses, and dots — none of which are escaped.

Defensive priority

Defenders should prioritize verifying and updating Mang Board installations to prevent potential XSS attacks.

Recommended defensive actions

• Verify Mang Board plugin version and update to a patched version if necessary
• Implement input sanitization and output escaping for user-supplied data
• Monitor for potential XSS attacks on affected installations
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and source item provide details on the vulnerability, including the affected versions and parameters. The vulnerability was publicly disclosed on October 14, 2026, and has not been modified since then. There are no known instances of exploitation, but defenders should verify and update Mang Board installations to prevent potential XSS attacks. The official CVE Program record and NIST NVD detail page provide additional information on the vulnerability.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.