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CVE-2026-75106 – Unauthenticated Access to/Overwrite of Submission Data via Predictable IDs – OpnFor

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Summary

CVE-2026-75106 is a critical vulnerability in OpnForm, an open-source form builder, caused by predictable generation of editable-submission secrets. OpnForm derives these secrets from sequential submission identifiers using the Hashids library with an empty default salt, allowing an unauthenticated attacker to compute valid secrets for any submission. This affects OpnForm versions before 2.0.2 and carries a CVSS v3.1 base score of 9.1 (Critical).

Technical details

  • Root cause: OpnForm uses Hashids to obfuscate sequential, numeric submission identifiers into "editable submission" secrets, but initializes Hashids with an empty default salt instead of a unique, secret value.
  • Trigger conditions: Because the salt is empty and identifiers are sequential, an attacker can locally reproduce the same Hashids encoding scheme and compute valid secrets for arbitrary submission IDs without needing any credentials.
  • Attack vector: Network-based, unauthenticated (AV:N, PR:N, UI:N) — no interaction with a legitimate user or prior access is required.
  • Impact: A remote attacker can use predicted hashes to read other respondents’ full submission data via the submission-fetch endpoint, or overwrite existing submissions by supplying a predicted hash to the answer endpoint, resulting in loss of confidentiality and integrity of form submission data.

Affected software

  • OpnForm versions prior to 2.0.2 (all versions from initial release up to and including 2.0.1)

Severity

  • CVSS v3.1 Base Score: 9.1 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Mitigation and recommended actions

  • Immediate: Upgrade OpnForm to version 2.0.2 or later, which fixes the editable-submission identifier generation.
  • If immediate patching is not possible: Restrict or monitor access to submission-fetch and answer endpoints, rotate/invalidate existing editable-submission links, and treat any pre-2.0.2 submission edit links as compromised since they rely on the predictable Hashids scheme.

References

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