Internal resource disclosure via unrestricted proxy fetch
Published Sep 5, 2026 · Updated Sep 5, 2026
Server-side request forgery in Webstudio 0 through 0.296.0 allows remote attackers to read internal resources through public proxy routes. The image, video, and asset route loaders decode an attacker-controlled absolute URL and pass it directly to fetch without restricting its scheme, destination host, resolved address, or redirects. Exploitation requires a self-hosted instance with RESIZE_ORIGIN unset and exposes response bodies from cloud metadata and internal services without authentication.
Summary
What happened
Server-side request forgery in Webstudio 0 through 0.296.0 allows remote attackers to read internal resources through public proxy routes. The image, video, and asset route loaders decode an attacker-controlled absolute URL and pass it directly to fetch without restricting its scheme, destination host, resolved address, or redirects. Exploitation requires a self-hosted instance with RESIZE_ORIGIN unset and exposes response bodies from cloud metadata and internal services without authentication.
The record
- CVE
- CVE-2026-86119
- Published
- Sep 5, 2026
- Updated
- Sep 5, 2026
- Vendor
- Webstudio
- Product
- Webstudio
- Classifications
- CWE-918, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 5, 2026CVE publishedPublication date reported by the CVE source.
- Sep 5, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=0.296.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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