PHP
CVE-2026-21642
MEDIUM
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Revive Adserver's banner-acl.php and channel-acl.php scripts contain reflected cross-site scripting vulnerabilities that allow attackers to execute arbitrary JavaScript in an administrator's browser by crafting malicious URLs. An authenticated attacker can exploit this to perform actions with administrative privileges if a logged-in admin visits the crafted link. No patch is currently available for this vulnerability affecting PHP-based Revive Adserver installations.
Technical ContextAI
Classified as CWE-79 (Cross-site Scripting (XSS)). Affects Revive Adserver. 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.
RemediationAI
Monitor vendor advisories for a patch. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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