{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-21642", "assignerOrgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1", "state": "PUBLISHED", "assignerShortName": "hackerone", "dateReserved": "2026-01-01T15:00:02.340Z", "datePublished": "2026-01-20T20:48:48.079Z", "dateUpdated": "2026-01-21T20:47:21.691Z"}, "containers": {"cna": {"descriptions": [{"lang": "en", "value": "HackerOne community member Patrick Lang (7yr) has reported a reflected XSS vulnerability in the `banner-acl.php` and `channel-acl.php` scripts of Revive Adserver. An attacker can craft a specific URL that includes an HTML payload in a parameter. If a logged in administrator visits the URL, the HTML is sent to the browser and malicious scripts would be executed."}], "affected": [{"defaultStatus": "unaffected", "vendor": "Revive", "product": "Revive Adserver", "versions": [{"version": "6", "status": "affected", "lessThanOrEqual": "6.0.4", "versionType": "semver"}]}], "references": [{"url": "https://hackerone.com/reports/3470970"}], "metrics": [{"cvssV3_0": {"version": "3.0", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "baseScore": 6.1, "baseSeverity": "MEDIUM"}}], "providerMetadata": {"orgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1", "shortName": "hackerone", "dateUpdated": "2026-01-20T20:48:48.079Z"}}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-79", "lang": "en", "description": "CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')"}]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-01-21T20:47:02.677630Z", "id": "CVE-2026-21642", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-01-21T20:47:21.691Z"}}]}}

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{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:aquaplatform:revive_adserver:*:*:*:*:*:*:*:*", "matchCriteriaId": "FB1E6D97-42AD-4A1B-89B3-86356A4B5E59", "versionEndIncluding": "6.0.4", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "HackerOne community member Patrick Lang (7yr) has reported a reflected XSS vulnerability in the `banner-acl.php` and `channel-acl.php` scripts of Revive Adserver. An attacker can craft a specific URL that includes an HTML payload in a parameter. If a logged in administrator visits the URL, the HTML is sent to the browser and malicious scripts would be executed."}], "id": "CVE-2026-21642", "lastModified": "2026-01-30T20:14:51.447", "metrics": {"cvssMetricV30": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "version": "3.0"}, "exploitabilityScore": 2.8, "impactScore": 2.7, "source": "support@hackerone.com", "type": "Secondary"}]}, "published": "2026-01-20T21:16:06.310", "references": [{"source": "support@hackerone.com", "tags": ["Third Party Advisory"], "url": "https://hackerone.com/reports/3470970"}], "sourceIdentifier": "support@hackerone.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

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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"]}