Medium 6.1Published Oct 19, 2026

CVE-2026-111059Mercury: Stored / DOM Cross-Site Scripting (XSS): mr.Markdown renders untrusted content as raw, unsanitized HTML

Updated under an hour ago (2026-10-21 03:10 UTC)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for mljar mercury

Exploited in the last 30 days

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.

CVSS: 6.1 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness (CWE): CWE-79, CWE-116
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Oct 20, 2026
First seen by InfoSec Signals: Oct 19, 2026

Affected products

Affected products

mljar mercury mljar:mercury (from the name)	from 3.0.0, < 3.2.11	CNA record

References

https://github.com/mljar/mercury/security/advisories/GHSA-2658-85cv-9wwqx-refsource-confirm
https://github.com/mljar/mercury/commit/c798a85924e6614c6fea7afe5a560e4554a1d09bx-refsource-misc
https://github.com/mljar/mercury/releases/tag/v3.2.11x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.