CVE-2026-21642

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{}

{"analysis": {"en": {"generated_at": "2026-04-18T19:56:00.514655+00:00", "value": {"mitigation_remediation": ["Upgrade Revive Adserver to the latest release once the security patch becomes available", "Modify banner\u2011acl.php and channel\u2011acl.php to escape or validate all user\u2011supplied parameters before inclusion in output", "Implement a strong Content Security Policy that blocks the execution of inline scripts and limits script sources"], "summary": {"action": "Assess Impact", "impact": "Reflected Cross\u2011Site Scripting allowing arbitrary script execution in an administrator\u2019s browser session"}, "threat_synthesis": {"affected_systems": "Revive:Revive Adserver. No specific version information is available, so any deployed instance that includes the banner-acl.php and channel-acl.php modules is potentially affected until a fix is applied.", "description_and_impact": "The vulnerability is a reflected XSS flaw discovered in the banner-acl.php and channel-acl.php scripts of Revive Adserver. An attacker can embed hostile HTML or JavaScript in a parameter of a specially crafted URL. When a logged\u2011in administrator opens that URL, the server echoes the payload back to the browser and the malicious script runs with the administrator\u2019s privileges.", "risk_and_exploitability": "The CVSS score of 6.1 indicates a medium severity level, while the EPSS score of less than 1% points to a very low exploitation probability at present. The vulnerability is not listed in the CISA KEV catalog. Exploitation requires delivering the crafted URL to a legitimate administrator and convincing them to visit it; the attack would run only in the context of the administrator\u2019s session."}}}}, "created": "2026-01-21T11:18:39.390280+00:00", "title": "Reflected XSS in Revive Adserver Administrator Scripts", "updated": "2026-04-18T20:00:09.299687+00:00", "vendors": ["revive", "revive$PRODUCT$adserver"]}