Vulnerability · Published Jan 20, 2026 · Assigned by hackerone
CVE-2026-21663
Medium 6.1
In plain English
A medium-severity cross-site scripting in Revive Adserver from Revive. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities).
Severity (CVSS 3.0)6.1Medium
Exploit odds (30 days)0.2%top 90.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Revive | Revive Adserver | 6 – through 6.0.4 |
Weakness: CWE-79 · Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N