CVE-2026-42455

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Source
https://cve.org/CVERecord?id=CVE-2026-42455
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42455.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-42455
Aliases
  • GHSA-fjvg-mch3-j3vg
Published
2026-05-08T23:10:11.218Z
Modified
2026-07-27T03:56:17.245973750Z
Severity
  • 8.8 (High) CVSS_V4 - 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 CVSS Calculator
Summary
LinkWarden: Stored XSS via Client-Side Archive Upload (Unsanitized HTML served from same origin)
Details

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.

Database specific 
{
    "cwe_ids": [
        "CWE-79"
    ],
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42455.json"
}
References

Affected packages

Git / github.com/linkwarden/linkwarden

Affected ranges

Type
GIT
Repo
https://github.com/linkwarden/linkwarden
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Last affected
815d2faa885bba5f715e80424155e3927a626ea6
Database specific 
{
    "source": "AFFECTED_FIELD",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "2.14.0"
        }
    ]
}

Affected versions

v.*
v.2.11.0
v1.*
v1.0.0
v1.0.1
v1.1.0
v1.2.0
v1.2.1
v1.2.2
v1.2.3
v1.2.4
v1.2.5
v2.*
v2.0.0
v2.1.0
v2.10.0
v2.10.1
v2.10.2
v2.11.1
v2.11.2
v2.11.3
v2.11.4
v2.11.5
v2.11.6
v2.11.7
v2.11.8
v2.12.0
v2.12.1
v2.12.2
v2.13.0
v2.13.1
v2.13.2
v2.13.3
v2.13.4
v2.13.5
v2.14.0
v2.2.0
v2.2.1
v2.3.0
v2.4.0
v2.4.1
v2.4.2
v2.4.3
v2.4.4
v2.8.0
v2.8.1
v2.8.2
v2.8.3
v2.8.4
v2.9.0
v2.9.1
v2.9.2
v2.9.3

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42455.json"