TI-2026-85998 Aliases CVE-2026-123839 GHSA-9x95-36v2-wjrr

Arbitrary URL opening without confirmation in JetBrains IntelliJ IDEA

LOW 21CWE-357Published 2026-11-06 · Updated 2026-11-06

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: None · Low · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

JetBrains IntelliJ IDEA before 2026.3 allows opening arbitrary URLs without confirmation through the Remote Development port forwarding model. A remote attacker can cause the IDE to open a URL without the user being warned, which requires user interaction. The flaw is classified as insufficient UI warning of dangerous operations (CWE-357).

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

In JetBrains IntelliJ IDEA before 2026.3 opening arbitrary URLs without confirmation was possible via the Remote Development port forwarding model

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00254 16th percentileScored 2026-11-07

Fix Fixed IntelliJ IDEA (JetBrains): 2026.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
JetBrains	IntelliJ IDEA	before 2026.3	2026.3	Patch available	CNA

IntelliJ IDEA VendorJetBrains Affected before 2026.3 Fixed in 2026.3 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:jetbrains:intellij_idea::::::::	—	—	JetBrains

cpe:2.3:a:jetbrains:intellij_idea:*:*:*:*:*:*:*:* Versions — — ·JetBrains

Remediation

Update JetBrains IntelliJ IDEA to version 2026.3 or later.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Fix · CNA IntelliJ IDEA (JetBrains) Fixed in 2026.3

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-11-06
JetBrains IntelliJ IDEA 2026.3
21 records Highest priority Priority LOW 21 LOW
Other records, highest priority first
- TI-2026-86000 Code execution via symlinks in IntelliJ IDEA settings archive importPriority LOW 35
- TI-2026-85997 Code execution in JetBrains IntelliJ IDEA Safe Mode via UI DesignerPriority LOW 35
- TI-2026-85846 Path traversal in JetBrains IntelliJ IDEA via Dev Container archivesPriority LOW 35
Show all 21 records →

Timeline

2026-11-06 Threatist record created from CVE-2026-123839
2026-11-06 CISA SSVC decision points changed
2026-11-06 Alias added: GHSA-9x95-36v2-wjrr

References

Other 1

https://www.jetbrains.com/privacy-security/issues-fixed/

TI-2026-45031 Deserialization of untrusted data in JetBrains TeamCity KEVCVSS 3.1CRITICAL 9.8
TI-2024-18053 In JetBrains TeamCity before 2023.11.4 authentication bypass allowing to perform admin actions was possible KEVCVSS 3.1CRITICAL 9.8
TI-2023-22884 In JetBrains TeamCity before 2023.05.4 authentication bypass leading to RCE on TeamCity Server was possible KEVCVSS 3.1CRITICAL 9.8
TI-2024-18054 In JetBrains TeamCity before 2023.11.4 path traversal allowing to perform limited admin actions was possible KEVCVSS 3.1HIGH 7.3
TI-2024-15905 In JetBrains TeamCity before 2023.11.3 authentication bypass leading to RCE was possible CVSS 3.1CRITICAL 9.8
TI-2024-24589 Insufficiently protected credentials in JetBrains IntelliJ IDEA CVSS 3.1CRITICAL 9.3

See all 787 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences