Medium severity · published May 12, 2026
CVE-2026-42157
Flowsint: Stored XSS on map node marker in map page
5.1
CVSS
0.3%
EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 28% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FL
flowsint · reconurge
< 1.2.3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-42157
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-42157
github.com
https://github.com/reconurge/flowsint/security/advisories/GHSA-gj93-2vcq-729w
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