CVE-2026-21663

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 script 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 script contains a reflected cross-site scripting vulnerability that allows attackers to execute arbitrary scripts in the browsers of authenticated administrators through a crafted URL. An attacker can inject malicious HTML payloads into vulnerable parameters, which execute when an admin visits the malicious link, potentially compromising administrative sessions and server configuration. …

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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-2026-21663 vulnerability details – vuln.today
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