CVE-2026-49384: In JetBrains PyCharm before 2025.3.4 stored XSS in Jupyter notebook Markdown cells was possible

Q: How do I fix CVE-2026-49384?

pycharm: upgrade to 2025.3.4. Exact commands for each OS are on this page.

Q: Is CVE-2026-49384 being exploited?

CVE-2026-49384 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-49384 affect?

CVE-2026-49384 affects pycharm. Severity is medium (CVSS 6.1). In JetBrains PyCharm before 2025.3.4 stored XSS in Jupyter notebook Markdown cells was possible

Q: How urgent is CVE-2026-49384?

Priority 23/100. No elevated risk signals yet.

Routine

MEDIUM 6.1UPGRADE

CVE-2026-49384 is a medium-severity flaw (CVSS 6.1) affecting pycharm. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 92%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-05-29
Last modified	2026-07-22

Publisher (CNA): JetBrains s.r.o. · Vendor: jetbrains

Last updated 2026-07-22 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-29 19:16 UTCPublished CVE record published
2026-07-22 06:10 UTCUpdated Record last modified

jetbrains pycharm UPGRADE

Affected: < 2025.3.4

Fixed in: 2025.3.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy pycharm || rpm -q pycharm || pycharm --version

2. UPGRADE to 2025.3.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade pycharm

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade pycharm

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-49384?

pycharm: upgrade to 2025.3.4. Exact commands for each OS are on this page.

Is CVE-2026-49384 being exploited?

CVE-2026-49384 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-49384 affect?

CVE-2026-49384 affects pycharm. Severity is medium (CVSS 6.1). In JetBrains PyCharm before 2025.3.4 stored XSS in Jupyter notebook Markdown cells was possible

How urgent is CVE-2026-49384?

Priority 23/100. No elevated risk signals yet.

Software pages

Jupyter vulnerabilities

Related CVEs

CVE-2026-65908 HIGH 8.6 UPGRADE In JetBrains PyCharm before 2026.1.4, 2026.2 arbitrary code execution via malicious Python executable was poss
CVE-2026-75060 HIGH 8.4 UPGRADE In JetBrains PyCharm before 2026.2.1 code execution was possible via unauthenticated Jupyter MCP tools
CVE-2026-75059 MEDIUM 4.4 UPGRADE In JetBrains PyCharm before 2026.2.1 code execution via Quick Documentation was possible

References

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