CVE-2026-61529 Endatix: Blind second-order SSRF via anonymous form-submission file URLs (`SubmissionFileExtractor`)
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-61529?
CVE-2026-61529 is a medium-severity vulnerability in endatix, published on 28 Oct 2026.
Official description
Endatix is a self-hosted form and survey management platform with a headless API. Prior to 0.7.0, the anonymous `POST /forms/{formId}/submissions` endpoint stores attacker-controlled `JsonData` after checking only that the JSON is well formed. A file object with `name`, `type` and `content` fields can contain an HTTP or HTTPS URL. When a staff member with `submissions.view` permission invokes `POST /forms/{formId}/submissions/{submissionId}/files`, `GetFilesHandler` passes the stored data to `SubmissionFileExtractor` in `src/Endatix.Infrastructure/Features/Submissions/SubmissionFileExtractor.cs`, which calls `HttpClient.GetAsync` without validating the destination URL, host or resolved IP addresses against internal address ranges. This permits stored, second-order server-side GET requests to internal services, cloud metadata, loopback and link-local addresses from the server's network position. The form must have `IsPublic` and `IsEnabled` set, and an anonymous submission must pass reCAPTCHA v3 when configured. The fetched response is placed in the staff viewer's ZIP, not returned directly to the attacker, so disclosure to the attacker is blind or indirect through observable request behavior or information exposed by the viewer. No integrity or availability impact is asserted; data: and raw-base64 `content` are decoded locally without network requests. This issue is fixed in version 0.7.0.
Weakness: CWE-918
Which versions are affected by CVE-2026-61529?
How do I fix CVE-2026-61529?
No fix has been published for CVE-2026-61529 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-61529 being exploited?
There is no known exploitation of CVE-2026-61529 in the wild and no public exploit code.
Sources
Also known as GHSA-jw28-j36r-gp9m.