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CVE-2026-57501

Zen: Context-menu "Open link in glance" / "Split link in new tab" loads a page-controlled link with the System principal, bypassing the web-content scheme restriction

N/A
Published: July 9, 2026 at 10:27 PM UTC
Updated: October 25, 2026 at 03:10 PM UTC
1 product affected across 1 vendorZen Browser (desktop)

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Severity
N/A
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

Zen is a firefox-based browser. Prior to 1.21.5b, Zen's glance and split-view context-menu actions, Open link in glance and Split link in new tab, load a page-controlled link URL with the System principal instead of the originating page's principal, allowing a malicious web page to place a link to a file URL that can load with System privileges when opened through either context-menu item and bypass the content-to-file security check that blocks an ordinary click. This issue is fixed in version 1.21.5b.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Zen Browser (desktop)· Zen Browser
90%
v < 1.21.5b
Affected range stops below 1.21.5b, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (3)

x_refsource_CONFIRM
Source: cverecord
https://github.com/zen-browser/desktop/security/advisories/GHSA-vpvg-hp3v-rm5q
x_refsource_MISC
Source: cverecord
https://github.com/zen-browser/desktop/commit/44f7616238208200547c7df500d945752d7b6379
x_refsource_MISC
Source: cverecord
https://github.com/zen-browser/desktop/releases/tag/1.21.5b

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-266

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