Threat intelligence

PostX <= 5.0.13 - Authenticated (Contributor+) Stored Cross-Site Scripting via Post Comments Block

CVE-2026-5158 · ultimate-post

Important: Seeing this vulnerability listed does not mean your website is affected. Exposure depends on whether you run Ultimate Post at a vulnerable version. How SiteRespond intelligence works

Vulnerability: PostX <= 5.0.13 - Authenticated (Contributor+) Stored Cross-Site Scripting via Post Comments Block
Affected software: ultimate-post(Plugin)
Affected versions: ≤ 5.0.13
Authentication: Authenticated (see advisory title)
Vulnerability type: Cross-site scripting
CVE: CVE-2026-5158
Published: 5 August 2026
CISA KEV: Not listed in CISA KEV at last catalog refresh
Impact: May allow attackers to run scripts in visitors' browsers or hijack admin sessions.
Source: Data imported from Wordfence Intelligence (advisory 032861f0-9d94-4f6a-a119-eb0e09b20c5d). Methodology and redistribution notes

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