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PatchSiren cyber security CVE debrief

CVE-2026-49382 JetBrains CVE debrief

A template injection vulnerability in the Copyright plugin of JetBrains IntelliJ IDEA before version 2026.1 could allow code execution. The vulnerability, classified as CWE-1336 (Improper Neutralization of Special Elements Used in a Template Engine), requires local access with high attack complexity and user interaction. The CVSS 3.1 score of 4.5 reflects limited impacts to confidentiality, integrity, and availability. JetBrains has addressed this issue in version 2026.1, as documented in their security advisories.

Vendor
JetBrains
Product
IntelliJ IDEA
CVSS
MEDIUM 4.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-29
Original CVE updated
2026-07-22
Advisory published
2026-05-29
Advisory updated
2026-07-22

Who should care

Organizations and developers using JetBrains IntelliJ IDEA, particularly those utilizing the Copyright plugin with custom templates. Development teams in regulated industries with strict code provenance requirements should prioritize patching due to potential supply chain implications if malicious templates were distributed.

Technical summary

The Copyright plugin in JetBrains IntelliJ IDEA versions prior to 2026.1 contains a template injection vulnerability (CWE-1336) that can lead to code execution. The vulnerability stems from improper neutralization of special elements in template expressions used by the plugin. Exploitation requires user interaction and high attack complexity, limiting practical exploitability. The attack vector is local, meaning an attacker would need to leverage local access or social engineering to deliver a malicious payload. JetBrains has patched this vulnerability in version 2026.1.

Defensive priority

medium

Recommended defensive actions

  • Upgrade JetBrains IntelliJ IDEA to version 2026.1 or later to remediate the template injection vulnerability in the Copyright plugin
  • Review and audit custom copyright templates in use prior to upgrading, as these may contain or trigger the vulnerable code path
  • For environments where immediate upgrading is not feasible, restrict access to IntelliJ IDEA configurations and avoid opening untrusted projects that may contain malicious copyright templates
  • Monitor JetBrains security advisories for additional guidance or patches that may be released for older supported versions
  • Consider implementing application control policies to prevent execution of untrusted code within the IDE environment

Evidence notes

The vulnerability affects IntelliJ IDEA versions prior to 2026.1. The CVSS vector (CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L) indicates local attack vector, high complexity, no privileges required, user interaction needed, with low impacts across confidentiality, integrity, and availability. The weakness is identified as CWE-1336 (template injection).

Sources and references

Verified primary and authoritative sources

  • CVE-2026-49382 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-49382

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

  • CVE-2026-49382 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-49382

    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.