# elFinder: CSRF in netmount allows forced FTP mounts and server-side FTP connections

Advisory record · `GHSA-9hjf-w35w-6vx2`

- **Identifiers:** `GHSA-9hjf-w35w-6vx2` · `CVE-2026-81890` · `PKSA-th2b-2jzf-hmp6`
- **State:** Confirmed
- **Severity:** CVSS 5.4 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-352](https://cwe.mitre.org/data/definitions/352.html)
- **Tags:** [Cross-site request forgery (CSRF)](https://agentprime.io/advisories/tag/csrf.md)
- **Published:** 2 Sept 2026
- **Updated:** 2 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 2 Sept 2026, 14:37 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `studio-42/elfinder` (Packagist): affected `<2.1.70`; fixed in `2.1.70`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> elFinder (Packagist studio-42/elfinder) versions before 2.1.70 do not apply CSRF validation to the netmount command. In the shipped minimal connector configuration, where FTP network mounts are enabled by default, a cross-site request can make a victim's elFinder session mount an attacker-chosen FTP endpoint and cause the server to open an outbound FTP connection. Upgrade to version 2.1.70, which is the fixed release.

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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0018, the 7th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:06 UTC: First seen by agentprime
- 31 Oct 2026, 14:06 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-9hjf-w35w-6vx2)

## Sources

- [GitHub Advisory Database: GHSA-9hjf-w35w-6vx2](https://github.com/advisories/GHSA-9hjf-w35w-6vx2)
- [OSV: GHSA-9hjf-w35w-6vx2](https://osv.dev/vulnerability/GHSA-9hjf-w35w-6vx2)
- <https://github.com/Studio-42/elFinder/security/advisories/GHSA-9hjf-w35w-6vx2>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-81890>
- <https://github.com/Studio-42/elFinder/commit/31284facd033e081b2b69c08873b39c8a413b762>
- <https://github.com/Studio-42/elFinder/commit/36d40fff12222ad4c229d8889d8ed3fd3dbf0415>
- <https://github.com/Studio-42/elFinder>
- <https://github.com/Studio-42/elFinder/releases/tag/2.1.70>

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-9hjf-w35w-6vx2>, 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-9hjf-w35w-6vx2/>. Everything for agents: <https://agentprime.io/llms.txt>.