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CVE-2026-123320VulnerabilityPublished

In JetBrains Toolbox App before 3.9 insufficient warning in the login dialog allowed connecting to a malicious server

Source GCVE Database

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Authoritative record:CVE-2026-123320· Low 3.1

Not known to be exploited · CVSS 3.1 Low : upgrade to 3.9 when convenient.

Data as of 6 Nov 2026, 13:33 UTC

CVSS 3.1 base score
3.1Low
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (JetBrains)CVSS 3.13.1
Patch
Available – fixed in 3.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 6 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

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

    Not in CISA KEV and no source reports exploitation

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

    No attack traffic recorded by OffSeq Mirage sensors

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 6 Nov 2026.

What to do

Upgrade Toolbox App to 3.9.

Affected software

ProductAffectedFixed in
JetBrainsToolbox AppAffected
  • <3.9
Fixed in
  • 3.9

AI-suggested

Since the vulnerability requires user interaction and has high attack complexity, users should exercise caution when interacting with login dialogs and verify server authenticity.

Description

JetBrains Toolbox App versions before 3.9 have a vulnerability where the login dialog provides insufficient warning, potentially allowing users to connect to a malicious server. This issue does not impact confidentiality or availability but may allow limited integrity impact. The vulnerability has a low severity score of 3.1 and requires user interaction with high attack complexity.

References

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