# Formie: Pre-authenticated server-side template injection in Hidden fields Advisory record · `GHSA-x7m9-mwc2-g6w2` - **Identifiers:** `GHSA-x7m9-mwc2-g6w2` · `CVE-2026-45697` · `PKSA-snft-3cv8-v5p5` - **State:** Confirmed - **Severity:** CVSS 9.8 Critical - **Critical:** Yes: CVSS 9+ - **Weakness (CWE):** [CWE-94](https://cwe.mitre.org/data/definitions/94.html) · [CWE-693](https://cwe.mitre.org/data/definitions/693.html) · [CWE-1336](https://cwe.mitre.org/data/definitions/1336.html) - **Tags:** [Code injection](https://agentprime.io/advisories/tag/code-injection.md) · [CWE-693](https://agentprime.io/advisories/tag/cwe-693.md) - **Published:** 18 May 2026 - **Updated:** 10 Sept 2026 - **Reviewed by a person:** No Published by the GitHub Advisory Database at 18 May 2026, 17:23 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. ## Critical Critical, because: - CVSS score 9.8: 9.0 or more. How we decide what’s critical: ## Affected packages - `verbb/formie` (Packagist): affected `>=3.0.0-beta.1, <3.1.24 || <2.2.20`; fixed in `3.1.24`, `2.2.20` ## Machine-written summary Summary written by Claude Haiku from the source advisory. Not reviewed by a person. > Formie, a Craft CMS form plugin for Packagist package verbb/formie, is vulnerable in versions below 2.2.20 and from 3.0.0-beta.1 up to (not including) 3.1.24. An unauthenticated user can submit crafted values to Hidden fields configured with a Custom default value, and these values are evaluated as Twig during form submission, which could seriously compromise the Craft site depending on template sandbox behavior; no control panel login is needed. Upgrade to 2.2.20 or 3.1.24, or as a temporary workaround, remove Hidden fields from public forms or change their default away from Custom. Written 31 Oct 2026. ## Not analysed yet We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check. ## Severity and exploitation - 9.8 Critical, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`, from CNA (GitHub_M) - **CISA KEV:** Not listed. - **EPSS:** 0.0047, the 41st percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days. ## Timeline - 31 Oct 2026, 14:01 UTC: First seen by agentprime - 31 Oct 2026, 14:01 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-x7m9-mwc2-g6w2) ## Sources - [GitHub Advisory Database: GHSA-x7m9-mwc2-g6w2](https://github.com/advisories/GHSA-x7m9-mwc2-g6w2) - [OSV: GHSA-x7m9-mwc2-g6w2](https://osv.dev/vulnerability/GHSA-x7m9-mwc2-g6w2) - - - - - - Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code. ## Check whether this affects you A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet. - With the agentprime MCP server (), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: - In a browser: reads your lockfile in the browser, never uploading it. - Whether it touches your code, with file and line: the Claude Code plugin, - As JSON: , or `POST https://api.agentprime.io/v1/match` with your packages () --- The web page: . Everything for agents: .