CVE-2026-75106

Received Received - Intake

OpnForm Submission Data Exposure via Predictable Hashes

Publication date: 2026-08-17

Last updated on: 2026-08-17

Assigner: VulnCheck

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.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-08-17

Last Modified

2026-08-17

Generated

2026-08-18

AI Q&A

2026-08-18

EPSS Evaluated

N/A

NVD

CVE-2026-75106

EUVD

EUVD-2026-60386

Affected Vendors & Products

Currently, no data is known.

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-340	The product uses a scheme that generates numbers or identifiers that are more predictable than required.

Attack-Flow Graph

Executive Summary

OpnForm uses sequential row identifiers to generate editable-submission secrets with Hashids and an empty salt. This allows unauthenticated attackers to predict hashes for any submission. Attackers can then access other users' full submission data via the submission-fetch endpoint or overwrite submissions by guessing the correct hash.

Impact Analysis

If you use OpnForm, attackers could read your sensitive submission data without authentication. They might also modify or delete your submissions by predicting the required hashes. This could lead to data breaches, loss of confidential information, or unauthorized changes to your data.

Compliance Impact

This vulnerability likely violates GDPR and HIPAA due to unauthorized access to personal or health data. GDPR requires protecting personal data, while HIPAA mandates safeguards for health information. The flaw could result in non-compliance, legal penalties, and reputational damage.

Mitigation Strategies

Update OpnForm to the latest version where the default salt is no longer empty. Ensure all submissions are reviewed for unauthorized access or modifications. Implement network monitoring for unusual activity on submission endpoints.

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