# Umbraco Vulnerable to Improper File Access and Credential Exposure in Dictionary Import Functionality

Advisory record · `GHSA-hfv2-pf68-m33x`

- **Identifiers:** `GHSA-hfv2-pf68-m33x` · `CVE-2025-66625`
- **State:** Confirmed
- **Severity:** CVSS 4.9 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-200](https://cwe.mitre.org/data/definitions/200.html) · [CWE-377](https://cwe.mitre.org/data/definitions/377.html) · [CWE-552](https://cwe.mitre.org/data/definitions/552.html)
- **Tags:** [Information disclosure](https://agentprime.io/advisories/tag/info-disclosure.md) · [CWE-377](https://agentprime.io/advisories/tag/cwe-377.md)
- **Published:** 9 Dec 2025
- **Updated:** 9 Dec 2025
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 9 Dec 2025, 17:12 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `Umbraco.Cms` (NuGet): affected `>=10.0.0, <13.12.1`; fixed in `13.12.1`

## 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

- 4.9 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0036, the 29th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 15:22 UTC: First seen by agentprime
- 31 Oct 2026, 15:22 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-hfv2-pf68-m33x)

## Sources

- [GitHub Advisory Database: GHSA-hfv2-pf68-m33x](https://github.com/advisories/GHSA-hfv2-pf68-m33x)
- [OSV: GHSA-hfv2-pf68-m33x](https://osv.dev/vulnerability/GHSA-hfv2-pf68-m33x)
- <https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-hfv2-pf68-m33x>
- <https://nvd.nist.gov/vuln/detail/CVE-2025-66625>
- <https://github.com/umbraco/Umbraco-CMS/commit/7505efd433189037f46547932d4a8b603fd4a615>
- <https://github.com/umbraco/Umbraco-CMS>

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 (<https://api.agentprime.io/mcp>), 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: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-hfv2-pf68-m33x>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-hfv2-pf68-m33x/>. Everything for agents: <https://agentprime.io/llms.txt>.