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CVE-2026-49384
medium
CVSS 6.1
In JetBrains PyCharm before 2025.3.4 stored XSS in Jupyter notebook Markdown cells was possible
Summary
In JetBrains PyCharm before 2025.3.4 stored XSS in Jupyter notebook Markdown cells was possible
AI summary snake-internal / snake-template-v1
A weakness called CVE-2026-49384 was discovered in Jetbrains.
In plain terms, it is a flaw that lets attackers sneak nasty scripts into a webpage.
Severity is Medium (CVSS 6.1/10). Exploitation requires specific conditions but can cause real harm if successful.
What you should do: update the affected software to the latest version. If unsure, ask your IT team or search the vendor's site for "Jetbrains CVE-2026-49384".
CVE-2026-49384 (Jetbrains). Severity: Medium / CVSSv3 6.1. Category: CWE-79.
Response plan:
1. Check the vendor advisory for affected versions and the patched release.
2. If a vulnerable version is running in production, schedule maintenance (urgency from KEV/CVSS).
3. If no patch yet, mitigate via WAF rule, disabling the affected feature, etc.
4. Monitor logs / SIEM for known IOC and PoC signatures of this CVE.
PoCs and fix commits: see the 'References' section, MITRE, and NVD.
❓ What is the problem
A weakness (CVE-2026-49384) in Jetbrains. In plain words, it is a flaw that lets attackers sneak nasty scripts into a webpage.
📍 Affected scope
Target versions of Jetbrains (see vendor advisory). If running in production, identify exposure immediately.
🔥 Severity
Severity: Medium (CVSS 6.1/10). Exploitation requires specific conditions but can cause real harm if successful.
🔧 How to fix
Update to the patched release as listed in the vendor advisory. (Typical mitigation pattern for CWE-79)
🛡️ Workaround
If a patch is not yet available, consider disabling the affected feature, applying WAF rules, blocking via network ACLs, or isolating the vulnerable version.
🔍 Detection
Check version information, scan dependencies via SBOM, and monitor SIEM for IOC and PoC signatures related to this CVE.