# CVE-2026-49366 — JetBrains IntelliJ IDEA

> As of 2026-05-30, CVE-2026-49366 is a HIGH-severity vulnerability in JetBrains IntelliJ IDEA, CVSS v3.1 7.8, EPSS 0.4% (36.3th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-49366, most recently “Multiple JetBrains Product Vulnerabilities: Account Takeover, Privilege Escalation, and RCE Across Hub, YouTrack, IntelliJ IDEA, Kotlin, GoLand, and TeamCity”.

**Last updated:** 2026-05-30

## What is CVE-2026-49366?

In JetBrains IntelliJ IDEA before 2026.1.1 command injection was possible via filename completion

The record classifies CVE-2026-49366 under weakness class [CWE-78](https://intel.threadlinqs.com/cwe/CWE-78). Its CVSS v3 base vector states that the flaw requires local access to the host, needs no prior authentication, needs a user to take an action first, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 129 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 7.8 — HIGH (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **EPSS (FIRST):** 0.4% probability of exploitation in the next 30 days, higher than 36.3% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 5.4/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-05-29, last modified 2026-05-30

## Is CVE-2026-49366 being exploited?

No public exploitation evidence for CVE-2026-49366 is recorded in the sources Threadlinqs tracks — CISA KEV, Exploit-DB, public proof-of-concept repositories and ProjectDiscovery Nuclei — as of 2026-05-30. That is an absence of evidence in those feeds, not a guarantee that the vulnerability is unexploited.

## Affected products and versions

- [JetBrains](https://intel.threadlinqs.com/vendors/jetbrains): IntelliJ IDEA

## How to fix CVE-2026-49366

No vendor patch reference has been recorded for CVE-2026-49366 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-49366

1 tracked threat in the Threadlinqs corpus references CVE-2026-49366, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Multiple JetBrains Product Vulnerabilities: Account Takeover, Privilege Escalation, and RCE Across Hub, YouTrack, IntelliJ IDEA, Kotlin, GoLand, and TeamCity](https://intel.threadlinqs.com/threat/TL-2026-1069) — HIGH · 2026-07-02

## Sources

Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-07-02.

**Other references**

- [jetbrains.com](https://www.jetbrains.com/privacy-security/issues-fixed/)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-49366
Full detection coverage and IOCs for threats exploiting CVE-2026-49366 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp