Vulnerability · Published May 12, 2026 · Assigned by GitHub_M

CVE-2026-42157Flowsint: Stored XSS on map node marker in map page

Medium 5.1

In plain English

A medium-severity cross-site scripting in flowsint from reconurge. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities).

Severity (CVSS 4.0)5.1Medium

Exploit odds (30 days)0.3%top 72.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Flowsint is an open-source OSINT graph exploration tool designed for cybersecurity investigation, transparency, and verification. Prior to 1.2.3, a remote attacker can create a map node with a malicious label that contains arbitrary HTML. When the map tab is selected and a map node marker is selected, it will render the arbitrary HTML, potentially triggering stored XSS. This vulnerability is fixed in 1.2.3.

Affected products (as reported)

Vendor	Product	Versions
reconurge	flowsint	< 1.2.3

Weakness: CWE-79 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

References

https://github.com/reconurge/flowsint/security/advisories/GHSA-gj93-2vcq-729w x_refsource_CONFIRM