Security readout for executives and security teams
Plain-English summary
A maliciously crafted IntelliJ UI Designer form file could cause arbitrary code to run in IntelliJ IDEA versions before 2026.2. A successful compromise could expose source code, developer credentials, or other workstation data and could alter files or disrupt development work.
Executive priority
Treat as a high-priority developer-workstation update. Promptly inventory and upgrade exposed IntelliJ installations, especially where external repositories or form files are handled. Escalate if sensitive code, signing material, production credentials, or privileged developer access resides on affected systems. Current evidence does not justify an emergency active-exploitation declaration.
Technical view
CVE-2026-64815 is a CWE-94 code-injection flaw in JetBrains IntelliJ IDEA before 2026.2 involving UI Designer form files. It carries CVSS 3.1 score 8.1 (high), with network reachability, high attack complexity, no required privileges or user interaction, unchanged scope, and high confidentiality, integrity, and availability impacts.
Likely exposure
Potentially exposed environments are those running IntelliJ IDEA earlier than 2026.2 where UI Designer form files can enter developer workflows. The supplied affected-version metadata is inconsistent, listing version "0" and defaulting to unaffected, so organizations should confirm exact editions and builds against JetBrains guidance.
Exploitation context
The supplied sources do not report active exploitation, and this CVE is not identified as CISA KEV in the provided bundle. The CVSS vector indicates exploitation has high complexity, but successful exploitation could execute arbitrary code without privileges or user interaction. No public exploit availability is established by the supplied evidence.
Researcher notes
The central issue is arbitrary code injection through UI Designer form files, categorized as CWE-94. The record does not provide root-cause details, exploit prerequisites beyond the CVSS vector, affected editions, detection indicators, or evidence of exploitation. The anomalous affected-version data should not override the explicit statement that versions before 2026.2 are vulnerable.
Mitigation direction
- Upgrade IntelliJ IDEA to version 2026.2 or later after confirming JetBrains release guidance.
- Prioritize developers who handle UI Designer form files from external or less-trusted repositories.
- Restrict untrusted form files from developer workflows until affected installations are upgraded.
- Review JetBrains security guidance for edition-specific fixes or additional precautions.
Validation and detection
- Inventory installed IntelliJ IDEA editions, versions, and managed developer endpoints.
- Identify installations earlier than 2026.2 and assign remediation owners.
- Confirm upgraded clients report version 2026.2 or later.
- Review endpoint telemetry for unusual IntelliJ child processes or file modifications.
- Verify JetBrains guidance against each deployed edition and build.
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-94: Code execution behavior lookup
Code execution and unsafe deserialization weaknesses often justify reviewing execution behavior and process 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-2026-64815 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
- 8.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/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:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H2.25.9JetBrainsVulnerability scoring details
Base CVSS 3.1 score
8.1HighVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/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 Control of Generation of Code ('Code Injection')
Improper Control of Generation of Code ('Code Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.