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.

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.

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.

Affected products

Opnform — versions 0

Weakness classification (CWE)

CWE-340

References

disclosure@vulncheck.com (issue-tracking)
disclosure@vulncheck.com (product)
disclosure@vulncheck.com (patch)
disclosure@vulncheck.com (release-notes)
disclosure@vulncheck.com (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.