Vulnerability details
CVE-2026-42455
linkwarden linkwarden
LinkWarden: Stored XSS via Client-Side Archive Upload (Unsanitized HTML served from same origin)
CVSS 4.0
8.8High
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.8High | 4.0 | CVEProject cvelistV5 (CNA) (GitHub_M) | 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 |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| linkwarden | linkwarden | <= 2.14.0 | CVEProject cvelistV5 (CNA) |
References and advisories
1- https://github.com/linkwarden/linkwarden/security/advisories/GHSA-fjvg-mch3-j3vg x_refsource_CONFIRM
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Details
- Published
- 2026-05-09
- Last updated
- 2026-05-12
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
0.45%
Probability of exploitation in 30 days
39.9%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- Proof of concept
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')