CVE-2026-21642

MEDIUM
2026-01-20 [email protected]
6.1
CVSS 3.0
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CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
CVE Published
Jan 20, 2026 - 21:16 nvd
MEDIUM 6.1

Tags

PHP XSS Revive Adserver

Description

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.

Analysis

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. …

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Remediation

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

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Priority Score

31
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +30
POC: 0

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CVE-2026-21642 vulnerability details – vuln.today
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