Vulnerability in Opnform
CVE-2026-75106
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.
Published · last modified .
CVSS v3 metric
CVSS v3 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.
EPSS exploit prediction
EPSS: 0.004 (31.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 31.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
- Opnform — versions 0
Weakness classification (CWE)
References
- github.com/OpnForm/OpnForm/issues/1259 (issue-tracking)
- github.com/OpnForm/OpnForm (product)
- github.com/OpnForm/OpnForm/commit/6c67ff0a9bc0ac27ae26b32b8e108a176f8161b1 (patch)
- github.com/OpnForm/OpnForm/releases/tag/v2.0.2 (release-notes)
- www.vulncheck.com/advisories/opnform-editable-submission-secret-derivation-via-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-75106?
- CVE-2026-75106 is a critical-severity vulnerability in Opnform, classified under CWE-340. CVSS score: 9.1/10. Published 2026-08-17.
- How severe is CVE-2026-75106?
- Critical severity. CVSS v3 base score is 9.1 out of 10.