What’s Vulnerable › Vulnerabilities

CVE-2026-42159: Flowsint: Stored XSS in description of node

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-05-14 · updated 2026-10-26
• Weakness: CWE-79

Description

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 analyses. Sketches have controllable graphs, which are comprised of nodes and relationships. The sketches contain information on an OSINT target (usernames, websites, etc) within these nodes and relationships. A remote attacker can create a node with a malicious description that contains arbitrary HTML. When the node is selected, it will render the arbitrary HTML, potentially triggering stored XSS. This vulnerability is fixed in 1.2.3.

Affected products

• reconurge flowsint: before 1.2.3 — fixed in 1.2.3

How to fix

Upgrade to a fixed version: reconurge flowsint 1.2.3. Check the vendor advisory for mitigations.

References

• https://github.com/reconurge/flowsint/security/advisories/GHSA-w233-5mmx-cr7x
• https://github.com/reconurge/flowsint/security/advisories/GHSA-w233-5mmx-cr7x

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