How severe is CVE-2026-21663?

CVE-2026-21663 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-21663 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-21663?

CVE-2026-21663 affects Aquaplatform Revive Adserver. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-21663?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-21663 have an EU (EUVD) identifier?

Yes. CVE-2026-21663 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-3330.

When was CVE-2026-21663 published?

CVE-2026-21663 was published on 2026-01-20 and last updated on 2026-06-17.

CVE-2026-21663

CVE-2026-21663 is a medium-severity vulnerability in Aquaplatform Revive Adserver with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
EPSS exploit prediction: 0% (6th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-3330
Weakness: CWE-79
Affected product: Aquaplatform Revive Adserver
Published: 2026-01-20
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-21663?: 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.
How severe is CVE-2026-21663?: CVE-2026-21663 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-21663 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-21663?: CVE-2026-21663 affects Aquaplatform Revive Adserver. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-21663?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-21663 have an EU (EUVD) identifier?: Yes. CVE-2026-21663 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-3330.
When was CVE-2026-21663 published?: CVE-2026-21663 was published on 2026-01-20 and last updated on 2026-06-17.

References

https://hackerone.com/reports/3473696

Affected products (1)

cpe:2.3:a:aquaplatform:revive_adserver:*:*:*:*:*:*:*:*

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