CVE-2026-75106

Critical

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.

SeverityCritical

CVSS9.1

Exploit probability—

Product

OpnForm

PublishedAug 17, 2026

First seenAug 17, 2026

Weakness typeCWE-340CWE-340

How to fix

Update

OpnForm OpnForm2.0.2 or later

Patches

github.com/OpnForm/OpnForm/commit/6c67ff0a9bc0ac27ae26b32b8e108a176f8161b1

Vendor advisories

github.com/OpnForm/OpnForm/releases/tag/v2.0.2

Affected products

Product	Affected versions	Fixed in
OpnForm OpnForm	v < 2.0.2	2.0.2

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