Description
OpnForm derives editable-submission secrets from sequential row identifiers using Hashids with an empty default salt, allowing unauthenticated attackers to compute hashes for any submission. Attackers can read other respondents' full submission data through the submission-fetch endpoint or overwrite submissions by supplying predicted hashes to the answer endpoint.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| OpnForm | OpnForm | < 2.0.2 | 2.0.2 |
References
- GitHub Issue #1259 issue-tracking
- https://github.com/OpnForm/OpnForm product
- Fix editable submission identifiers (#1173) patch
- OpnForm v2.0.2 Release Notes release-notes
- VulnCheck Advisory: OpnForm Editable Submission Secret Derivation via Empty Hashids Salt third-party-advisory