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PatchSiren cyber security CVE debrief

CVE-2026-86503 JetBrains CVE debrief

CVE-2026-86503 is a LOW-severity vulnerability in JetBrains IntelliJ IDEA that could lead to Server-Side Request Forgery (SSRF) attacks via Kubernetes spec-source URL fetching when opening an untrusted project. The vulnerability exists in versions before 2026.2.2. Defenders should prioritize verifying exposure, especially in deployments allowing untrusted projects, and consider updating to version 2026.2.2 or later. The CVE record and NVD entry provide limited information about the vulnerability, with a CVSS score of 3.3 and a LOW severity rating. The source confidence is limited, and further verification is needed to assess the full impact.

Vendor
JetBrains
Product
IntelliJ IDEA
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 securing IntelliJ IDEA deployments, especially those allowing untrusted projects, should assess exposure and prioritize verification and remediation.

Why it matters

CVE-2026-86503 is a LOW-severity vulnerability in JetBrains IntelliJ IDEA that could lead to SSRF attacks. Defenders should prioritize verifying exposure, updating to version 2026.2.2 or later, and restricting untrusted project openings.

  • Potential SSRF attacks via Kubernetes spec-source URL fetching
  • Need to verify IntelliJ IDEA version and update to 2026.2.2 or later
  • Possible restriction of opening untrusted projects in IntelliJ IDEA

Technical summary

The vulnerability exists in JetBrains IntelliJ IDEA before version 2026.2.2, where opening an untrusted project could trigger Server-Side Request Forgery (SSRF) via Kubernetes spec-source URL fetching. This could potentially lead to SSRF attacks. Defenders should prioritize verifying exposure in IntelliJ IDEA deployments, especially where untrusted projects are opened, and consider updating to version 2026.2.2 or later.

Defensive priority

Defenders should prioritize verifying exposure in IntelliJ IDEA deployments, especially where untrusted projects are opened.

Recommended defensive actions

  • Verify IntelliJ IDEA version and update to 2026.2.2 or later if necessary
  • Restrict opening untrusted projects in IntelliJ IDEA
  • Monitor for potential SSRF attacks

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability, with a CVSS score of 3.3 and a LOW severity rating. The source confidence is limited, and further verification is needed to assess the full impact. Evidence from the CVE Program and NVD detail page supports this assessment. However, additional verification tasks are required to confirm affected scope, severity, and vendor guidance.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-86503 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-86503

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

  • CVE-2026-86503 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-86503

    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.