CVE-2026-75106
OpnForm Editable Submission Secret Derivation via Empty Hashids Salt
- State
- Published
- Severity
- 9.3 Critical
- Published
- Aug 17, 2026
- Updated
- Oct 1, 2026
- Reserved
- Aug 17, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.3 Critical | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 9.1 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N | VulnCheck |
Weaknesses
- CWE-340 Generation of Predictable Numbers or Identifiers
Affected Products
| Product | Versions |
|---|---|
OpnFormOpnForm |
|
References
- GitHub Issue #1259issue-tracking
- https://github.com/OpnForm/OpnFormproduct
- Fix editable submission identifiers (#1173)patch
- OpnForm v2.0.2 Release Notesrelease-notes
- VulnCheck Advisory: OpnForm Editable Submission Secret Derivation via Empty Hashids Saltthird-party-advisory
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