CVE-2026-86490: CWE-863 in JetBrains YouTrack
CVE-2026-86490 is a medium severity vulnerability in JetBrains YouTrack prior to version 2026.2.18634. It involves improper permission checks that allow an attacker with limited privileges to overwrite bundled applications via the app import endpoint. This could lead to unauthorized modification of application components. No official patch or remediation guidance has been provided yet by the vendor.
AI Analysis
Technical Summary
This vulnerability (CWE-863) in JetBrains YouTrack before 2026.2.18634 allows users with some level of privilege to bypass proper permission checks and overwrite bundled apps through the app import endpoint. The flaw arises from insufficient enforcement of access controls, enabling unauthorized modification of application components. The CVSS 3.1 base score is 6.5, reflecting a network attack vector with low complexity, requiring privileges but no user interaction, and impacting integrity without affecting confidentiality or availability.
Potential Impact
An attacker with limited privileges can overwrite bundled applications in YouTrack, potentially altering application behavior or injecting malicious code. This compromises the integrity of the affected system components but does not directly impact confidentiality or availability according to the CVSS vector.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict access to the app import endpoint and review permissions to limit exposure.
CVE-2026-86490: CWE-863 in JetBrains YouTrack
Description
CVE-2026-86490 is a medium severity vulnerability in JetBrains YouTrack prior to version 2026.2.18634. It involves improper permission checks that allow an attacker with limited privileges to overwrite bundled applications via the app import endpoint. This could lead to unauthorized modification of application components. No official patch or remediation guidance has been provided yet by the vendor.
CVSS v3.1
Score 6.5medium
Affected software
pkg:github/jetbrains/YouTrackRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-863) in JetBrains YouTrack before 2026.2.18634 allows users with some level of privilege to bypass proper permission checks and overwrite bundled apps through the app import endpoint. The flaw arises from insufficient enforcement of access controls, enabling unauthorized modification of application components. The CVSS 3.1 base score is 6.5, reflecting a network attack vector with low complexity, requiring privileges but no user interaction, and impacting integrity without affecting confidentiality or availability.
Potential Impact
An attacker with limited privileges can overwrite bundled applications in YouTrack, potentially altering application behavior or injecting malicious code. This compromises the integrity of the affected system components but does not directly impact confidentiality or availability according to the CVSS vector.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict access to the app import endpoint and review permissions to limit exposure.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- JetBrains
- Date Reserved
- 2026-09-07T16:13:36.999Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a9ee859acd9273b49f0e416
Added to database: 09/07/2026, 16:37:45 UTC
Last enriched: 09/07/2026, 16:54:24 UTC
Last updated: 09/08/2026, 00:20:13 UTC
Views: 9
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