# Cloudreve: Non-admin remote download users can SSRF loopback/internal services and read imported responses

Advisory record · `GHSA-x756-g4x3-c64m`

- **Identifiers:** `GHSA-x756-g4x3-c64m` · `CVE-2026-54562` · `GO-2026-6023`
- **State:** Confirmed
- **Severity:** CVSS 6.5 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-918](https://cwe.mitre.org/data/definitions/918.html)
- **Tags:** [Server-side request forgery (SSRF)](https://agentprime.io/advisories/tag/ssrf.md)
- **Published:** 20 Jul 2026
- **Updated:** 22 Jul 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 20 Jul 2026, 21:16 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `github.com/cloudreve/Cloudreve/v4` (Go): affected `<4.0.0-20260606025411-aaebf317a78f`; fixed in `4.0.0-20260606025411-aaebf317a78f`
- `github.com/cloudreve/Cloudreve/v3` (Go): affected `<=3.0.0-20250225100611-da4e44b77af4`; no fixed version yet

## Machine-written summary

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

> Cloudreve v4 versions before 4.0.0-20260606025411-aaebf317a78f and v3 versions up to and including 3.0.0-20250225100611-da4e44b77af4 are affected. A non-admin authenticated user whose group has the remote download permission can submit URLs pointing to loopback, localhost, or IPv6 localhost (including redirects to these) so the server-side downloader fetches internal services, and then read the imported response in their own files. Upgrade the v4 package to 4.0.0-20260606025411-aaebf317a78f; no fixed version is listed for v3.

Written 6 Nov 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0040, the 34th percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:58 UTC: First seen by agentprime
- 31 Oct 2026, 14:58 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-x756-g4x3-c64m)

## Sources

- [GitHub Advisory Database: GHSA-x756-g4x3-c64m](https://github.com/advisories/GHSA-x756-g4x3-c64m)
- [OSV: GHSA-x756-g4x3-c64m](https://osv.dev/vulnerability/GHSA-x756-g4x3-c64m)
- <https://github.com/cloudreve/cloudreve/security/advisories/GHSA-x756-g4x3-c64m>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-54562>
- <https://github.com/cloudreve/cloudreve/commit/aaebf317a78f2413d74afd66c21a1f3143711312>
- <https://github.com/cloudreve/cloudreve>
- <https://github.com/cloudreve/cloudreve/releases/tag/4.16.1>

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-x756-g4x3-c64m>, 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-x756-g4x3-c64m/>. Everything for agents: <https://agentprime.io/llms.txt>.