CVE-2026-47266
formie's unauthenticated front-end submission editing can overwrite existing submissions
Description
### Impact Unauthenticated users could modify existing submissions by posting a known or guessed submission ID to `formie/submissions/save-submission`. ### Patches [2.2.21](https://github.com/verbb/formie/releases/tag/2.2.21), [3.1.26](https://github.com/verbb/formie/releases/tag/3.1.26) ### Workarounds Block unauthenticated access to `actions/formie/submissions/save-submission`, or disable/customize front-end submission editing until patched. ### Credit formie extends many thanks to: - Florian (Cyber Security Engineer, arcade solutions ag) - Contact: [security@arcade.ch](mailto:security@arcade.ch)
How to fix CVE-2026-47266
To remediate CVE-2026-47266, upgrade the affected package to a fixed version below.
- —upgrade to 3.1.26 or later
Is CVE-2026-47266 being exploited?
Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- >= 3.0.0, < 3.1.26
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/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 |