What is CVE-2025-50891?

CVE-2025-50891 is a high-severity vulnerability in Adform Server-Side Backend For Site Tracking, classified under Cross-site Scripting. CVSS score: 7.2/10. Published 2025-08-19.

How severe is CVE-2025-50891?

High severity. CVSS v3 base score is 7.2 out of 10.

Is CVE-2025-50891 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

RCE in Adform Server-Side Backend For Site Tracking

CVE-2025-50891

The server-side backend for Adform Site Tracking before 2025-08-28 allows attackers to inject HTML or execute arbitrary code via cookie hijacking. NOTE: a customer does not need to take any action to update locally installed software (such as Adform Site Tracking 1.1).

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.004 (33.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N.

Affected products

Adform Server-side Backend For Site Tracking — versions 0

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2025-50891?: CVE-2025-50891 is a high-severity vulnerability in Adform Server-Side Backend For Site Tracking, classified under Cross-site Scripting. CVSS score: 7.2/10. Published 2025-08-19.
How severe is CVE-2025-50891?: High severity. CVSS v3 base score is 7.2 out of 10.
Is CVE-2025-50891 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.