CVE-2026-42455 Details
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.
A stored cross-site scripting vulnerability has been identified in Linkwarden, a self-hosted collaborative bookmark manager, in versions through 2.14.0. The issue arises in the archive upload endpoint, which accepts HTML files without properly sanitizing JavaScript content. When these archives are accessed later, the unsanitized HTML is served with a Content-Type of text/html, lacking a Content-Security-Policy header. This oversight enables the execution of arbitrary JavaScript in the context of the authenticated Linkwarden session.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed May 9, 2026CISA-ADP
Assessed May 12, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/linkwarden/linkwarden/security/advisories/GHSA-fjvg-mch3-j3vg | CISA-ADP | AdvisoryExploitVendor |
| https://github.com/linkwarden/linkwarden/security/advisories/GHSA-fjvg-mch3-j3vg | [email protected] | AdvisoryExploitVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Linkwarden | All versions |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 24, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 12, 2026 | CVE Modified | CISA-ADP |
| May 9, 2026 | New CVE Received | [email protected] |