CVE-2026-42455— LinkWarden: Stored XSS via Client-Side Archive Upload (Unsanitized HTML served from same origin)
Possible ATT&CK Techniques 3AI
T1505 · Server Software Component T1059 · Command and Scripting Interpreter T1189 · Drive-by CompromiseAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| linkwarden | linkwarden | <= 2.14.0 | affected |
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I. Basic Information for CVE-2026-42455
Vulnerability Information
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Vulnerability Title
LinkWarden: Stored XSS via Client-Side Archive Upload (Unsanitized HTML served from same origin)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Linkwarden 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linkwarden是Linkwarden开源的一个自托管协作书签管理器。 Linkwarden 2.14.0及之前版本存在跨站脚本漏洞，该漏洞源于存档上传端点接受HTML文件但未清理JavaScript内容，可能导致在已认证的Linkwarden会话环境中执行任意JavaScript。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| linkwarden | linkwarden | <= 2.14.0 | - |
II. Public POCs for CVE-2026-42455
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-42455 (1)
IV. Related Vulnerabilities
Same weakness: CWE-79
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Trix: Stored XSS vulnerability through serialized attributes - CVE-2026-73393
WordPress Subscribe2 plugin <= 10.46 - Cross Site Scripting - CVE-2026-73382
WordPress Site Reviews plugin <= 8.2.0 - Cross Site Scriptin
V. Comments for CVE-2026-42455
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