CVE-2026-42157 Flowsint: Stored XSS on map node marker in map page
Remote attackers can inject malicious HTML into map node labels, leading to stored XSS when viewed by other users.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-42157?
CVE-2026-42157 is a medium-severity cross-site scripting vulnerability in reconurge flowsint, published on 12 May 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-42157?
How do I fix CVE-2026-42157?
No fix has been published for CVE-2026-42157 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-42157 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42157 exists.
Sources
Also known as GHSA-gj93-2vcq-729w.