# CVE-2026-100265: JetBrains Rider AI Assistant unauthorized skill auto-update

Source: https://junglewise.ai/threats/cve-2026-100265-in-jetbrains-rider-before-2026-2-1-ai-assistant-could-auto  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-30. Updated: 2026-09-30  
License: CC BY 4.0 with a link back

CVE-2026-100265 · Severity: medium · CVSS 4.8 · Published 2026-09-30

JetBrains Rider is an IDE (integrated development environment) used by software developers. The AI Assistant feature could automatically download and install third-party skills without asking the developer for permission, potentially allowing malicious code or unwanted functionality to be silently added to the development environment.

Technologies: [Jetbrains Rider](https://junglewise.ai/threats/technologies/rider). Vendors: [Jetbrains](https://junglewise.ai/threats/vendors/jetbrains).

## Quick answers

**Is CVE-2026-100265 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-100265 being exploited in the wild.

**How severe is CVE-2026-100265?** Medium severity, with a CVSS score of 4.8, published 30 September 2026.

**Which products and versions are affected?** Jetbrains Rider before 2026.2.1.

**Is there a fix for CVE-2026-100265?** A patch was published on 2026-02: Rider 2026.2.1 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-100265 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-100265?** Check whether you run Jetbrains Rider at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The AI Assistant in JetBrains Rider prior to version 2026.2.1 lacks a user confirmation requirement for third-party skill updates, allowing automatic installation without consent. This is a privilege escalation and code execution vulnerability triggered by the auto-update mechanism. The vulnerability affects the IDE's extension/skill management system.

## Affected products

- JetBrains Rider before 2026.2.1

## Timeline

- 2026-09-30: disclosed
- 2026-02: patched: Rider 2026.2.1 released

## References

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

## Related threats

- [JetBrains Toolbox App and IDEs compromised certificate trust](https://junglewise.ai/threats/cve-2026-118697-in-jetbrains-toolbox-app-before-3-9-1-and-3-8-2-intellij-idea)
- [JetBrains IDEs embedded browser trusted revoked certificates](https://junglewise.ai/threats/cve-2026-118696-in-jetbrains-intellij-idea-pycharm-phpstorm-rubymine-and)
- [In JetBrains ReSharper, Rider and dotTrace before 2025.2.5 local privilege escalation was possible via race condition](https://junglewise.ai/threats/cve-2025-64457-in-jetbrains-resharper-rider-and-dottrace-before-2025-2-5-local)