CVE-2026-21664

Name: CVE-2026-21664
Creator: NVD / NIST
Published: 2026-01-20T21:16:07.223+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.16%

Last modified Jun 17, 2026

CVE-2026-21664 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. HackerOne community member Huynh Pham Thanh Luc (nigh7c0r3) has reported a reflected XSS vulnerability in the afr.php delivery script of Revive Adserver. An attacker can craft a specific URL that includes an HTML payload in a parameter. EPSS estimates a 0.16% chance of exploitation in the next 30 days.

Description

HackerOne community member Huynh Pham Thanh Luc (nigh7c0r3) has reported a reflected XSS vulnerability in the afr.php delivery 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.

Metrics

CVSS 3.0

6.1/10

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

0.16%

5.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Aquaplatform	Revive Adserver	>= 6.0.0, <= 6.0.4

References

https://hackerone.com/reports/3468169Third Party Advisory

Timeline

Published: Jan 20, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-21664?

How severe is CVE-2026-21664?

CVE-2026-21664 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.16% probability of exploitation in the next 30 days.

How do I fix CVE-2026-21664?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-21664?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST