Quantum Secular Labs / Blog / Advisories
CVE-2026-64813: Jetbrains Intellij Idea: Client-Side Enforcement of Server-Side Security
CVE-2026-64813 is rated critical with a CVSS v3.1 base score of 10.0 and affects Jetbrains Intellij Idea. Per its scoring, it can be exploited over the network, without authentication, without any user interaction. The scored impact on confidentiality, integrity and availability is the highest available.
Vulnerability description
In JetBrains IntelliJ IDEA before 2026.2 unauthorized settings modification was possible in a Remote Development session
Severity breakdown
CVSS v3.1 10.0: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- Attack vector: Network. Exploitable remotely over the network, with no need for local or physical access.
- Attack complexity: Low. No special conditions; the attack can be repeated reliably.
- Privileges required: None. No account or prior access is needed.
- User interaction: None. No action from any user is needed.
- Scope: Changed. Impact reaches beyond the vulnerable component to other resources.
- Confidentiality impact: High. Total loss of confidentiality; sensitive data can be fully disclosed.
- Integrity impact: High. Total loss of integrity; data or system state can be fully modified.
- Availability impact: High. Total loss of availability; the component can be shut down.
Underlying weakness
CWE-602: Client-Side Enforcement of Server-Side Security
The product includes a server that relies on the client to implement a protection mechanism that is intended to protect the server.
Affected products
- Jetbrains Intellij Idea: before 2026.2