What is CVE-2026-42159?

CVE-2026-42159 is a medium-severity vulnerability in Flowsint, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-05-14.

How severe is CVE-2026-42159?

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

XSS in Flowsint

CVE-2026-42159

Flowsint is an open-source OSINT graph exploration tool designed for cybersecurity investigation, transparency, and verification. Prior to 1.2.3, Flowsint allows a user to create investigations, which are used to manage sketches and analys…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (11.3th percentile) — read the EPSS interpretation.

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.

Affected products

Flowsint
Reconurge Flowsint — versions < 1.2.3

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-42159?: CVE-2026-42159 is a medium-severity vulnerability in Flowsint, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-05-14.
How severe is CVE-2026-42159?: Medium severity. CVSS v3 base score is 5.4 out of 10.