# CVE-2026-42156: reconurge Flowsint Cypher injection in node creation

Source: https://junglewise.ai/threats/cve-2026-42156-reconurge-flowsint-cypher-injection-in-node-creation  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-12. Updated: 2026-05-14  
License: CC BY 4.0 with a link back

CVE-2026-42156 · Severity: info · CVSS 7.1 · Published 2026-05-12

Flowsint, an open-source tool used for cybersecurity investigations and data mapping, contains a security flaw that allows users to run unauthorized database commands. By creating a specially crafted data node, an attacker can bypass security restrictions to view or steal sensitive investigation data belonging to other users. This could lead to the exposure of confidential research, target identities, and organizational investigation history.

Technologies: [Reconurge Flowsint](https://junglewise.ai/threats/technologies/flowsint). Vendors: [Reconurge](https://junglewise.ai/threats/vendors/reconurge).

## Quick answers

**Is CVE-2026-42156 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-42156 being exploited in the wild.

**How severe is CVE-2026-42156?** Informational severity, with a CVSS score of 7.1, published 12 May 2026.

**Which products and versions are affected?** Reconurge Flowsint < 1.2.3.

**Is there a fix for CVE-2026-42156?** A patch was published on 2026-05-12: Vulnerability fixed in version 1.2.3 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-42156 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-42156?** Check whether you run Reconurge Flowsint at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A Cypher injection vulnerability exists in 'flowsint-api/app/api/routes/sketches.py' within the 'add_node' function. The application uses f-strings to interpolate the user-provided 'node_type' directly into a Neo4j MERGE query without proper sanitization or parameterization. An authenticated attacker can provide a malicious 'type' value in a JSON payload to the '/api/sketches/{sketch_id}/nodes/add' endpoint to escape the intended query. This allows for the execution of arbitrary Cypher queries, enabling the attacker to exfiltrate all nodes and relationships across all investigations in the Neo4j database. The issue is resolved in version 1.2.3.

## Affected products

- reconurge Flowsint < 1.2.3

## Timeline

- 2026-04-29: advisory: GitHub Security Advisory published
- 2026-05-12: disclosed: CVE-2026-42156 published
- 2026-05-12: patched: Vulnerability fixed in version 1.2.3

## References

- [https://github.com/reconurge/flowsint/security/advisories/GHSA-h5m2-c2c5-968p](https://github.com/reconurge/flowsint/security/advisories/GHSA-h5m2-c2c5-968p)

## Related threats

- [Reconurge Flowsint stored XSS in node description](https://junglewise.ai/threats/cve-2026-42159-reconurge-flowsint-stored-xss-in-node-description)
- [reconurge Flowsint broken access control in sketch logs](https://junglewise.ai/threats/cve-2026-44352-reconurge-flowsint-broken-access-control-in-sketch-logs)
- [reconurge Flowsint improper access control in investigation metadata update](https://junglewise.ai/threats/cve-2026-42158-reconurge-flowsint-improper-access-control-in-investigation)
- [Reconurge Flowsint stored XSS in map node markers](https://junglewise.ai/threats/cve-2026-42157-reconurge-flowsint-stored-xss-in-map-node-markers)
- [Reconurge Flowsint command injection and container escape in org_to_asn](https://junglewise.ai/threats/cve-2026-32311-reconurge-flowsint-command-injection-and-container-escape-in-org)