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EUVD-2026-60386 · Published Aug 17, 2026
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.
Weaknesses
CWE-340
CVSS scores
- v4.09.3
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - v3.19.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
MITRE ATT&CK
InferredWhere this vulnerability fits in an attack
Initial Access
References
- https://github.com/OpnForm/OpnForm
- https://github.com/OpnForm/OpnForm/commit/6c67ff0a9bc0ac27ae26b32b8e108a176f8161b1
- https://github.com/OpnForm/OpnForm/issues/1259
- https://github.com/OpnForm/OpnForm/releases/tag/v2.0.2
- https://www.vulncheck.com/advisories/opnform-editable-submission-secret-derivation-via-empty-hashids-salt
Potentially impacted assets
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