CVE-2026-49384 Cross-site scripting in PyCharm

Medium 6.1 Published 29 May 2026 Updated 29 May 2026

Stored XSS in PyCharm Jupyter notebooks allows attackers to execute arbitrary code via malicious Markdown cells.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2026-49384?

CVE-2026-49384 is a medium-severity cross-site scripting vulnerability in JetBrains PyCharm, published on 29 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

In JetBrains PyCharm before 2025.3.4 stored XSS in Jupyter notebook Markdown cells was possible

Weakness: CWE-79

Which versions are affected by CVE-2026-49384?

It affects 1 product.

Products include Jetbrains Pycharm.

How do I fix CVE-2026-49384?

No fix has been published for CVE-2026-49384 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2026-49384 being exploited?

There is no known exploitation of CVE-2026-49384 in the wild and no public exploit code.

Sources

Also known as GHSA-94rv-v2wh-r9wx.