CVE-2026-104078

Obsidian Desktop < 1.14.0 RCE via MathJax Safe Filter Bypass

State: Published
Severity: 8.4 High
Published: Oct 8, 2026
Updated: Oct 27, 2026
Reserved: Oct 1, 2026

Description

Obsidian Desktop before 1.14.0 contains a filter bypass vulnerability in the bundled MathJax 3.2.2 Safe component that allows attackers to execute arbitrary code by embedding a crafted \href value with a TAB byte in the URL scheme, causing filterURL to produce an empty protocol that bypasses the configured safeProtocols restrictions. Attackers can craft a note containing a malicious MathJax formula that renders as a javascript: URL anchor, which when clicked by the victim in Live Preview executes in the Node-integration-enabled vault renderer via require('child_process'), achieving arbitrary operating system command execution as the desktop user.

Scores

CVSS	Score	Vector	Source
4.0	8.4 High	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	VulnCheck
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	VulnCheck

Weaknesses

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-1188 Initialization of a Resource with an Insecure Default

Affected Products

Product	Versions
Obsidian DesktopObsidian	before 1.14.0Affected

References

Product Changelogrelease-notespatch
CodeAnt AI Blogtechnical-descriptionexploit
VulnCheck Advisory: Obsidian Desktop < 1.14.0 RCE via MathJax Safe Filter Bypassthird-party-advisory

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