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PatchSiren cyber security CVE debrief

CVE-2026-86485 JetBrains CVE debrief

A low-severity vulnerability was found in JetBrains YouTrack before version 2026.2.18634, allowing IP spoofing via HTTP headers, which could be used to forge Bitbucket webhooks. This issue, with a CVSS score of 3.3, poses a low risk but could impact organizations using YouTrack for issue tracking and project management, particularly those integrating with Bitbucket for version control. Defenders should assess exposure, prioritize patching, and review security configurations to mitigate potential risks. The CVE record and NVD entry provide limited information about the vulnerability, emphasizing the need for defenders to verify the affected version and apply patches.

Vendor
JetBrains
Product
YouTrack
CVSS
LOW 3.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-07
Original CVE updated
2026-09-07
Advisory published
2026-09-07
Advisory updated
2026-09-07

Who should care

Defenders responsible for JetBrains YouTrack installations should assess exposure and prioritize patching. This vulnerability may impact organizations using YouTrack for issue tracking and project management, particularly those integrating with Bitbucket for version control.

Why it matters

CVE-2026-86485 is a low-severity vulnerability in JetBrains YouTrack that allows IP spoofing via HTTP headers, potentially enabling forged Bitbucket webhooks. Defenders should verify the affected version, apply patches, and review security configurations to mitigate potential risks.

  • Verify affected YouTrack versions and apply patches
  • Review and enhance HTTP header validation and security configurations
  • Monitor for suspicious webhook activity from Bitbucket

Technical summary

The vulnerability, CVE-2026-86485, is a low-severity issue (CVSS score of 3.3) that affects JetBrains YouTrack before version 2026.2.18634. It allows for IP spoofing via HTTP headers, which could be exploited to forge Bitbucket webhooks. The CVE record and NVD entry provide limited information about the vulnerability.

Defensive priority

Defenders should prioritize verifying the affected version of JetBrains YouTrack and applying the necessary patches.

Recommended defensive actions

  • Verify the version of JetBrains YouTrack in use and apply patches if necessary
  • Review HTTP header handling and validation in YouTrack configurations
  • Monitor for suspicious webhook activity from Bitbucket

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability, with the primary source being the JetBrains security issues page. Defenders should verify the affected version of JetBrains YouTrack and apply necessary patches. The vulnerability allows for IP spoofing via HTTP headers, potentially enabling forged Bitbucket webhooks. Evidence is limited, and defenders must take a cautious approach to validate affected systems and enhance security configurations.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-86485 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-86485

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-86485 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-86485

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.