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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[2.4,2.4.16)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[2.4.16,*]"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "wpForo Forum", "source": "cna", "vendor": "gVectors Team"}, "product": "wpforo_forum", "vendor": "gvectors"}, {"configurations": [{"platform": null, "status": "unaffected", "versions": null}], "enrichment": {"confidence": 80.0, "confidence_source": "inferred", "scores": [{"score": 80.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "wordpress", "vendor": "wordpress"}], "analysis": {"en": {"generated_at": "2026-04-18T10:12:45.224143+00:00", "value": {"mitigation_remediation": ["Upgrade the wpForo Forum plugin to a version released after 2.4.14 that includes the missing authorization fix, if available.", "If an upgrade cannot be performed immediately, restrict the subscriber role so that it cannot access the wpforo_close_ajax endpoint or disable the close/reopen features for that role via the plugin settings.", "Review any custom code or hooks that may expose the wpforo_close_ajax handler and ensure that proper role validation is performed before allowing the action."], "summary": {"action": "Update plugin", "impact": "Unauthorized closing or reopening of forum topics by authenticated subscribers"}, "threat_synthesis": {"affected_systems": "The vulnerability affects the wpForo Forum plugin from gVectors Team. The only documented vulnerable version is 2.4.14, and any installation running this version is at risk. No evidence is provided that later releases contain a fix or that previous releases (prior to 2.4.14) are affected. Admins should verify the version in use and consult vendor release notes for remediation.", "description_and_impact": "CVE-2026-28555 reveals a missing authorization flaw in wpForo Forum 2.4.14 that lets any authenticated subscriber close or reopen any forum topic. Attackers can submit a valid nonce together with an arbitrary topic ID to the wpforo_close_ajax handler, bypassing the intended moderator permission checks and disrupting discussions. This flaw is a classic example of CWE\u2011862: missing authorization for operations.", "risk_and_exploitability": "The CVSS score of 5.3 indicates moderate severity, and the EPSS score of less than 1% suggests a low likelihood of exploitation in the wild. The issue is not listed in the CISA KEV catalog. Exploitation requires the attacker to be an authenticated subscriber with a valid session; the attacker then crafts an AJAX request to the wpforo_close_ajax endpoint. If the site hosts many subscribers, the attack surface expands, but the need for prior authentication limits the risk relative to remote code execution vulnerabilities."}}}}, "created": "2026-03-02T12:04:22.487130+00:00", "updated": "2026-04-18T10:15:25.880098+00:00", "vendors": ["gvectors", "gvectors$PRODUCT$wpforo_forum", "wordpress", "wordpress$PRODUCT$wordpress"]}