Critical severity · published Aug 13, 2026
CVE-2026-73602
Flowise before 3.1.3 Sandbox Escape to RCE
9.9
CVSS
0.8%
EPSS
No
On KEV
Description
Flowise before 3.1.3 contains a sandbox escape vulnerability in the vm2 JavaScript sandbox that allows authenticated users to execute arbitrary code by exploiting moment locale validation bypass. Attackers can craft a fake String object with a match function that bypasses path traversal checks to load and execute malicious JavaScript files stored in the document store outside the sandbox.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 57% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FL
Flowise · FlowiseAI
before 3.1.3 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-73602
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-73602
Broken Link
https://github.com/FlowiseAI/Flowise/commit/4211bfc8f15746be4019bba557e29a7ba83d54c5
Exploit
https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-rqh4-rxw3-93rp
Third Party Advisory
https://www.vulncheck.com/advisories/flowise-before-sandbox-escape-to-rce
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