CVE-2026-42159: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in reconurge flowsint
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.
AI Analysis
Technical Summary
CVE-2026-42159 is a stored cross-site scripting vulnerability in the open-source OSINT graph exploration tool Flowsint by reconurge. In versions before 1.2.3, nodes within sketches can contain descriptions with arbitrary HTML. When a user selects such a node, the malicious HTML is rendered without proper input neutralization, enabling stored XSS attacks. This vulnerability has a CVSS 4.0 base score of 5.3 (medium severity) and does not require privileges or authentication to exploit, but requires user interaction. The vulnerability is fixed in Flowsint version 1.2.3.
Potential Impact
Successful exploitation allows remote attackers to execute arbitrary HTML/JavaScript in the context of the victim's browser when they select a maliciously crafted node. This can lead to session hijacking, information disclosure, or other client-side impacts typical of stored XSS vulnerabilities. There is no indication of privilege escalation or direct system compromise from the provided data.
Mitigation Recommendations
Upgrade Flowsint to version 1.2.3 or later, where this vulnerability is fixed. Since this is an open-source tool and not a cloud service, users must apply the update themselves. Patch status is not explicitly stated but the description confirms the issue is fixed in 1.2.3. No other mitigation or temporary workaround is provided.
CVE-2026-42159: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in reconurge flowsint
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.
CVSS v4.0
Score 5.3medium
Affected software
pkg:github/reconurge/flowsintRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-42159 is a stored cross-site scripting vulnerability in the open-source OSINT graph exploration tool Flowsint by reconurge. In versions before 1.2.3, nodes within sketches can contain descriptions with arbitrary HTML. When a user selects such a node, the malicious HTML is rendered without proper input neutralization, enabling stored XSS attacks. This vulnerability has a CVSS 4.0 base score of 5.3 (medium severity) and does not require privileges or authentication to exploit, but requires user interaction. The vulnerability is fixed in Flowsint version 1.2.3.
Potential Impact
Successful exploitation allows remote attackers to execute arbitrary HTML/JavaScript in the context of the victim's browser when they select a maliciously crafted node. This can lead to session hijacking, information disclosure, or other client-side impacts typical of stored XSS vulnerabilities. There is no indication of privilege escalation or direct system compromise from the provided data.
Mitigation Recommendations
Upgrade Flowsint to version 1.2.3 or later, where this vulnerability is fixed. Since this is an open-source tool and not a cloud service, users must apply the update themselves. Patch status is not explicitly stated but the description confirms the issue is fixed in 1.2.3. No other mitigation or temporary workaround is provided.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-24T17:15:21.836Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a05f312ec166c07b0f45c93
Added to database: 05/14/2026, 16:06:42 UTC
Last enriched: 05/14/2026, 16:22:08 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 80
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