CVE-2026-86485: CWE-291 in JetBrains YouTrack
Description
CVE-2026-86485 is a vulnerability in JetBrains YouTrack before version 2026.2.18634 that allows IP spoofing via HTTP headers, enabling forged Bitbucket webhooks. The issue is classified under CWE-291 (Improper Authentication). The CVSS score is 3.5 (low severity), indicating limited impact primarily on confidentiality. No known exploits are reported in the wild. The vulnerability requires user interaction and local access vector with low attack complexity and no privileges required.
CVSS v3.1
Score 3.5low
Affected software
JetBrains
YouTrack
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in JetBrains YouTrack versions prior to 2026.2.18634 involves improper authentication (CWE-291) that permits IP spoofing through HTTP headers. This flaw allows an attacker to forge Bitbucket webhooks, potentially bypassing IP-based authentication checks. The CVSS 3.1 base score is 3.5, reflecting low confidentiality impact and no impact on integrity or availability. The attack vector is local with user interaction required, and the attack complexity is low with no privileges needed.
Potential Impact
The vulnerability allows an attacker to spoof IP addresses in HTTP headers to forge Bitbucket webhooks. This could lead to unauthorized webhook requests being accepted by YouTrack, potentially causing limited information disclosure. There is no impact on data integrity or availability. The overall impact is low.
Mitigation Recommendations
A fix is available in JetBrains YouTrack version 2026.2.18634. Users should upgrade to this version or later to remediate the vulnerability. Since this is not a cloud service, remediation depends on applying the official update. Patch status is confirmed by the version information provided.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- JetBrains
- Date Reserved
- 2026-09-07T16:13:35.720Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a9ee859acd9273b49f0e40a
Added to database: 09/07/2026, 16:37:45 UTC
Last enriched: 09/15/2026, 01:17:45 UTC
Last updated: 10/21/2026, 13:22:12 UTC
Views: 69
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.