Security readout for executives and security teams
Plain-English summary
This is a high-severity command injection flaw in JetBrains IntelliJ IDEA before 2026.1.1. A user action involving filename completion could let attacker-controlled input run commands on a developer workstation. The main business risk is compromise of developer machines, source code, credentials, and build access.
Executive priority
Treat this as a priority developer-workstation update. It is not evidenced as actively exploited in the provided sources, but successful abuse could affect source code, credentials, and delivery pipelines.
Technical view
CVE-2026-49366 is CWE-78 command injection in IntelliJ IDEA filename completion. CVSS 3.1 is 7.8: local attack vector, low complexity, no privileges required, user interaction required, unchanged scope, and high confidentiality, integrity, and availability impact. Sources identify affected IntelliJ IDEA versions as before 2026.1.1.
Likely exposure
Organizations using IntelliJ IDEA versions before 2026.1.1 are potentially exposed, especially developers who open or work with untrusted repositories, generated files, or externally supplied project content.
Exploitation context
The CVE record does not report public exploitation, and it is not listed as KEV in the provided bundle. Exploitation requires local context and user interaction, but developer endpoints are high-value targets because they often hold code, tokens, and deployment access.
Researcher notes
Evidence is limited to the CVE description, CVSS vector, CWE-78 classification, and JetBrains fixed-issues reference. The provided bundle does not describe vulnerable code paths, proof-of-concept details, exploit telemetry, or separate mitigations beyond the fixed version boundary.
Mitigation direction
- Upgrade IntelliJ IDEA to 2026.1.1 or later.
- Check JetBrains fixed-issues guidance for product-specific instructions.
- Prioritize developer workstations handling sensitive repositories or deployment credentials.
- Limit work with untrusted project content until affected IDEs are updated.
- Review endpoint controls around developer machines for suspicious command execution.
Validation and detection
- Inventory installed IntelliJ IDEA versions across developer endpoints.
- Confirm no active installations are older than 2026.1.1.
- Check software management logs for successful update deployment.
- Review EDR telemetry for unusual child processes from IntelliJ IDEA.
- Document exceptions and apply compensating controls until upgraded.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-78: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-49366 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H1.85.9JetBrainsVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://www.jetbrains.com/privacy-security/issues-fixed/CVE reference, JetBrains
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.