JetBrains IntelliJ IDEA up to 2026.2 Remote Development Port Forwarding Model input validation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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4.4$0-$5k0.79

Summaryinfo

A vulnerability was found in JetBrains IntelliJ IDEA up to 2026.2. It has been rated as problematic. Affected is an unknown function of the component Remote Development Port Forwarding Model. Performing a manipulation results in input validation. This vulnerability is identified as CVE-2026-123839. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic has been found in JetBrains IntelliJ IDEA up to 2026.2. This affects an unknown function of the component Remote Development Port Forwarding Model. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on integrity. The summary by CVE is:

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

It is possible to read the advisory at jetbrains.com. This vulnerability is uniquely identified as CVE-2026-123839 since 11/06/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 2026.3 eliminates this vulnerability.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.5
VulDB Meta Temp Score: 4.4

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 4.7
CNA Vector (JetBrains): 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: IntelliJ IDEA 2026.3

Timelineinfo

11/06/2026 Advisory disclosed
11/06/2026 +0 days CVE reserved
11/06/2026 +0 days VulDB entry created
11/06/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: jetbrains.com
Status: Confirmed

CNA: JetBrains
CVE: CVE-2026-123839 (🔒)

GCVE (CVE): GCVE-0-2026-123839
GCVE (VulDB): GCVE-100-431991

Entryinfo

Created: 11/06/2026 17:33
Changes: 11/06/2026 17:33 (63)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

Discussion

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