Blind SSRF via automatic redirect following
Published Apr 24, 2026 · Updated Apr 24, 2026
SSRF in @astrojs/cloudflare before 13.1.10 allows remote authenticated users to send blind requests through the image endpoint. The transform path in image-binding-transform.ts validates only the initial remote-image URL, then fetch() automatically follows redirects outside the configured allowlist. Exploitation requires the default cloudflare-binding image service and an open redirect on an allowed domain; the response body is not disclosed.
Summary
What happened
SSRF in @astrojs/cloudflare before 13.1.10 allows remote authenticated users to send blind requests through the image endpoint. The transform path in image-binding-transform.ts validates only the initial remote-image URL, then fetch() automatically follows redirects outside the configured allowlist. Exploitation requires the default cloudflare-binding image service and an open redirect on an allowed domain; the response body is not disclosed.
The record
- CVE
- CVE-2026-41321
- Published
- Apr 24, 2026
- Updated
- Apr 24, 2026
- Vendor
- Astro Technology Company
- Product
- @astrojs/cloudflare
- Classifications
- CWE-918, CAPEC-664, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 24, 2026CVE publishedPublication date reported by the CVE source.
- Apr 24, 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=< 13.1.10
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
- GHSA-88gm-j2wx-58h6 redirect-following proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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