CVE-2026-108565: XSS (CVSS 4.7)

Description

A reflected cross-site scripting vulnerability in the popup invocation options of Revive Adserver 6.0.8 and earlier allows an unauthenticated attacker to execute JavaScript in an authenticated user's browser by persuading them to visit a crafted URL. The top, left, timeout and delay request parameters are included in HTML attributes without appropriate encoding. Exploitation requires an existing popup zone, which can be created through the administrator API but is not offered by the normal zone-creation interface. The issue is fixed in Revive Adserver 6.0.9 by HTML-encoding the affected popup option values.

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CVSS v3.1 Score

4.7

MEDIUM

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

EPSS — Exploit Prediction

0.0020

Probability of exploitation

0.10%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

References

Other References

https://hackerone.com/reports/3971985

Frequently Asked Questions

What is CVE-2026-108565? +

A reflected cross-site scripting vulnerability in the popup invocation options of Revive Adserver 6.0.8 and earlier allows an unauthenticated attacker to execute JavaScript in an authenticated user's browser by persuading them to visit a crafted URL. The top, left, timeout and delay request parameters are included in HTML attributes without appropriate encoding. Exploitation requires an existing popup zone, which can be created through the administrator API but is not offered by the normal zone-creation interface. The issue is fixed in Revive Adserver 6.0.9 by HTML-encoding the affected popup option values. It has a CVSS v3.1 base score of 4.7 (MEDIUM).

How severe is CVE-2026-108565? +

CVE-2026-108565 has a CVSS v3.1 score of 4.7 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0020, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-108565? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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