CVE-2026-2737

High

Published: 02 April 2026

Published

02 April 2026

Modified

21 April 2026

KEV Added

—

Patch

—

CVSS Score v4 8.5 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Score 0.0020 9.4th percentile

Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-2737 is a high-severity Cross-site Scripting (CWE-79) vulnerability in Progress Flowmon. Its CVSS base score is 8.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Browser Session Hijacking (T1185); ranked at the 9.4th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

OWASP Top 10 for Web (2025)

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-18222

Vulnerability details

A vulnerability exists in Progress Flowmon versions prior to 12.5.8 and 13.0.6, whereby an administrator who clicks a malicious link provided by an attacker may inadvertently trigger unintended actions within their authenticated web session.

CWE(s): CWE-79

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1185 Browser Session Hijacking Collection

Adversaries may take advantage of security vulnerabilities and inherent functionality in browser software to change content, modify user-behaviors, and intercept information as part of various browser session hijacking techniques.

attack.mitre.org →

Why these techniques?

CWE-79 XSS in admin web UI enables session hijacking via malicious link click.

Confidence: MEDIUM · MITRE ATT&CK Enterprise v19.0