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Vulnerabilities CVE-2026-42455

CVE-2026-42455

High
Open
TLP:CLEAR

LinkWarden: Stored XSS via Client-Side Archive Upload (Unsanitized HTML served from same origin)

AI Analysis

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Description

Linkwarden is a self-hosted, open-source collaborative bookmark manager to collect, organize and archive webpages. In versions 2.14.0 and prior, the archive upload endpoint (POST /api/v1/archives/[linkId]?format=4) accepts HTML files (text/html) without sanitizing JavaScript content. When the archive is later accessed via GET /api/v1/archives/[linkId]?format=4, the HTML is served with Content-Type: text/html from the Linkwarden origin, without any Content-Security-Policy header. This allows arbitrary JavaScript execution in the context of the authenticated Linkwarden sessio. At time of publication, there are no publicly available patches.

Details

CVSS Score
8.8
EPSS Score
0.46%

37.9th percentile

CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
Confidence
90%
Published
May 8, 2026
Last Modified
May 8, 2026
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