CVE-2026-75106

OpnForm Editable Submission Secret Derivation via Empty Hashids Salt

Published Aug 17, 2026 CVSS 4.0 · 9.3 Critical EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Jhumanj
Jhumanj opnform
CPEs cpe:2.3:a:jhumanj:opnform:*:*:*:*:*:*:*:*
Vendors & Products Jhumanj
Jhumanj opnform
Type Values Removed Values Added
First Time appeared Opnform
Opnform opnform
Vendors & Products Opnform
Opnform opnform
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title OpnForm Editable Submission Secret Derivation via Empty Hashids Salt
Weaknesses CWE-340
References
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'}

cvssV4_0

{'score': 9.3, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Oct 1, 2026, 3:21 PM
Reserved
Aug 17, 2026, 5:28 PM
Status
Deferred
Published
Aug 17, 2026, 9:16 PM
Modified
Oct 1, 2026, 4:17 PM