What is CVE-2025-55123?

CVE-2025-55123 is a medium-severity vulnerability in Revive Adserver, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2025-11-20.

How severe is CVE-2025-55123?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Revive Adserver

CVE-2025-55123

Improper neutralization of input in Revive Adserver 5.5.2 and 6.0.1 and earlier versions causes manager accounts to be able to craft XSS attacks to their own advertiser users.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2025-11-20 · last modified 2026-09-26.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.004 (36.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 36.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Revive Adserver — versions 6, 5, 6.0.2
Revive-Adserver Revive Adserver — versions 6.0.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

hackerone.com/reports/3404968 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2025-55123?: CVE-2025-55123 is a medium-severity vulnerability in Revive Adserver, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2025-11-20.
How severe is CVE-2025-55123?: Medium severity. CVSS v3 base score is 5.4 out of 10.