What is CVE-2026-111059?

CVE-2026-111059 is a medium-severity vulnerability, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-10-19.

How severe is CVE-2026-111059?

Medium severity. CVSS v3 base score is 6.1 out of 10.

CVE-2026-111059

CVE-2026-111059

Mercury is a Python framework for sharing Jupyter notebooks as web applications and dashboards. From 3.0.0 until 3.2.11, mr.Markdown converts attacker-controlled Markdown to HTML without sanitizing raw HTML before assigning it to an ipywidgets.HTML sink. Event-handler attributes and other active HTML can therefore reach the DOM and execute when another user views the application. This issue is fixed in version 3.2.11.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-10-19 · last modified 2026-10-19.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-111059?: CVE-2026-111059 is a medium-severity vulnerability, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-10-19.
How severe is CVE-2026-111059?: Medium severity. CVSS v3 base score is 6.1 out of 10.