Quick answers
- Is CVE-2026-123298 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-123298 being exploited in the wild.
- How severe is CVE-2026-123298?
- Medium severity, with a CVSS score of 5, published 6 November 2026.
- Which products and versions are affected?
- Jetbrains Hub before 2026.2.52556.
- Is there a fix for CVE-2026-123298?
- Yes: fixed in 2026.2.52556. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-123298 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-123298?
- Check whether you run Jetbrains Hub 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.
How to fix
- Fixed in: 2026.2.52556
Technical details
The vulnerability is an SMTP command injection flaw in the email verification functionality of JetBrains Hub. An attacker can inject arbitrary SMTP commands through the email verification process, potentially bypassing email validation or sending unintended messages. This requires network access to the Hub instance and the ability to interact with the email verification mechanism.
Affected products
- JetBrains Hub before 2026.2.52556
Timeline
- 2026-11-06: disclosed