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

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Summary

CVECVE-2026-57501
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-09 23:17:05 UTC
Updated2026-07-10 21:16:59 UTC
DescriptionZen 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.

Risk And Classification

Primary CVSS: v3.1 0 NONE from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:N

EPSS: 0.002900000 probability, percentile 0.208380000 (date 2026-07-11)

Problem Types: CWE-266 | CWE-266 CWE-266: Incorrect Privilege Assignment

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary0NONECVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:N
3.1CNADECLARED0NONECVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Zen-browser Desktop affected < 1.21.5b Not specified

References

ReferenceSourceLinkTags
github.com/zen-browser/desktop/commit/44f7616238208200547c7df500d945752d... [email protected] github.com
github.com/zen-browser/desktop/security/advisories/GHSA-vpvg-hp3v-rm5q [email protected] github.com
github.com/zen-browser/desktop/releases/tag/1.21.5b [email protected] github.com
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