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VulnerabilityPublished Updated

CVE-2026-58057: Flowise · Improper Handling of Case Sensitivity

Affects FlowiseSource GCVE Database

0

Public exploit available (Exploit-DB) · CVSS 5.0 Medium : upgrade to 3.1.3 as a priority.

Data as of 26 Oct 2026, 13:47 UTC

CVSS 3.1 base score
5.0Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
1.5% chance of exploitation in 30 days – higher than 75% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 3.1.3
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L

Exploitation evidence

t = 0 is the CVE’s publication on cve.org

  1. Disclosed: evidence found.

    CVE published 28 Jun 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  4. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

Timeline

  1. CVE ID reserved

    by VulnCheck

    , 38 minutes before disclosure

  2. CVE published

    on cve.org

    , t = 0

  3. First Exploit-DB entry (opens in a new tab)

    Flowise 3.1.3 - arbitrary code execution

    , 9 days after disclosure

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Upgrade Flowise to 3.1.3.

Affected software

ProductAffectedFixed in
Flowise FlowiseAffected
  • <3.1.3
Fixed in
  • 3.1.3

AI-suggested

If you cannot patch yet, restrict access to authenticated users who can configure Custom MCP nodes and monitor for suspicious activity related to environment variable manipulation.

Description

CVE-2026-58057 is a vulnerability in Flowise versions before 3.1.3 where case-sensitive validation of environment variables allows bypass of a denylist on Windows systems. An authenticated user able to configure a Custom MCP node can exploit this to inject NODE_OPTIONS and execute arbitrary code on the Flowise server.

References

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