CVE-2026-75106 OpnForm Editable Submission Secret Derivation via Empty Hashids Salt
Unauthenticated attackers can predict submission secrets to read or modify other users' form data due to weak hash derivation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-75106?
CVE-2026-75106 is a critical vulnerability in OpnForm, published on 17 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-340
Which versions are affected by CVE-2026-75106?
How do I fix CVE-2026-75106?
No fix has been published for CVE-2026-75106 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-75106 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-75106 exists.
Sources
Also known as GHSA-3j74-gjwg-45jm.