CVE-2026-47266: Verbb/formie Formie's Unauthenticated Front-end Submission Editing Vulnerability

HIGH
Advisory Identifier: GHSA-pgxq-p76c-x9cg
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CWE-639
Published
Advisory Summary

CVE-2026-47266 is a HIGH formie's unauthenticated front-end submission editing vulnerability (CWE-639: Authorization Bypass Through User-Controlled Key) affecting Verbb/formie libraries in the Packagist ecosystem. The issue involves formie's unauthenticated front-end submission editing can overwrite existing submissions. Remediation is available by upgrading affected packages to version 3.1.26, 2.2.21.

CVE-2026-47266 at a Glance

CVE Identifier CVE-2026-47266
GHSA Identifier GHSA-pgxq-p76c-x9cg
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-639: Authorization Bypass Through User-Controlled Key
Affected Product Verbb/formie
Package Ecosystem Packagist
Published Date
Last Updated

How to Fix CVE-2026-47266

To remediate this vulnerability, upgrade all affected Verbb/formie dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

verbb/formie fixed: 3.1.26 
Upgrade verbb/formie to 3.1.26
verbb/formie fixed: 2.2.21 
Upgrade verbb/formie to 2.2.21
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for verbb/formie

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-47266, inspect your project dependencies for Verbb/formie:

inspect dependencies for verbb/formie

Analyze the terminal output to locate any version of Verbb/formie in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.1.26), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-639: Authorization Bypass Through User-Controlled Key, where the system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. In Verbb/formie, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### 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)

CVE-2026-47266 Affected Verbb/formie Versions

2 component(s)
Fixed Versions:
3.1.262.2.21
Product / Package Ecosystem Affected Versions Fixed Version
verbb/formie
 Packagist
≥ 3.0.0
< 3.1.26
3.1.26
verbb/formie
 Packagist
< 2.2.21
2.2.21

References

GitHub Advisory / Wiki ADVISORY
https://github.com/verbb/formie/security/advisories/GHSA-pgxq-p76c-x9cg
NVD — CVE-2026-47266 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-47266
Verbb/formie Source Repository REPOSITORY
https://github.com/verbb/formie
Verbb/formie Release RELEASE
https://github.com/verbb/formie/releases/tag/2.2.21
Verbb/formie Release RELEASE
https://github.com/verbb/formie/releases/tag/3.1.26

Frequently Asked Questions

What is CVE-2026-47266?
CVE-2026-47266 is a security vulnerability in Verbb/formie involving formie's unauthenticated front-end submission editing can overwrite existing submissions under CWE-639: Authorization Bypass Through User-Controlled Key.
Which Verbb/formie versions are affected?
Affected versions include releases prior to 3.1.26, 2.2.21 across affected packages: verbb/formie.
What version fixes CVE-2026-47266?
Upgrading to 3.1.26, 2.2.21 (or the latest patched release for your respective branch) resolves the vulnerability.
Is verbb/formie affected?
Yes, verbb/formie is affected in releases prior to 3.1.26, 2.2.21. Upgrade your dependency to 3.1.26, 2.2.21 or later.
What CWE is associated with CVE-2026-47266?
CVE-2026-47266 is classified under CWE-639: Authorization Bypass Through User-Controlled Key (The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.).
How can I check Packagist dependencies for CVE-2026-47266?
Run the dependency tree command: 'inspect dependencies for verbb/formie'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-pgxq-p76c-x9cg",
  "modified" : "2026-05-29T22:19:19Z",
  "published" : "2026-05-29T22:19:19Z",
  "aliases" : [ "CVE-2026-47266" ],
  "summary" : "formie's unauthenticated front-end submission editing can overwrite existing submissions",
  "details" : "### Impact\nUnauthenticated users could modify existing submissions by posting a known or guessed submission ID to `formie/submissions/save-submission`.\n\n### Patches\n[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)\n\n### Workarounds\nBlock unauthenticated access to `actions/formie/submissions/save-submission`, or disable/customize front-end submission editing until patched.\n\n### Credit\nformie extends many thanks to:\n- Florian (Cyber Security Engineer, arcade solutions ag)\n- Contact: [security@arcade.ch](mailto:security@arcade.ch)",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "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"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "verbb/formie"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.0.0"
      }, {
        "fixed" : "3.1.26"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "verbb/formie"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.2.21"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/verbb/formie/security/advisories/GHSA-pgxq-p76c-x9cg"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-47266"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/verbb/formie"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/verbb/formie/releases/tag/2.2.21"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/verbb/formie/releases/tag/3.1.26"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-639" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-29T22:19:19Z",
    "nvd_published_at" : "2026-05-29T20:16:28Z"
  }
}