CVE-2026-54562 Cloudreve: Non-admin remote download users can SSRF loopback/internal services and read imported responses
Non-admin users can exploit remote download features to access internal services and read responses via Server-Side Request Forgery.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-54562?
CVE-2026-54562 is a medium-severity server-side request forgery vulnerability in cloudreve, published on 15 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Cloudreve is a self-hosted file management and sharing system. Prior to 4.16.1, Cloudreve's remote download workflow accepts user-supplied URLs at POST /api/v4/workflow/download and passes them to the configured downloader without blocking loopback, localhost, IPv6 localhost, or redirect-to-loopback targets, allowing a non-admin user with remote download permission to fetch internal-only URLs and read the response after it is imported into the user's own files. This issue is fixed in version 4.16.1.
Weakness: CWE-918
Which versions are affected by CVE-2026-54562?
7 open source packages ship an affected version, including github.com/cloudreve/Cloudreve/v3, github.com/cloudreve/Cloudreve and github.com/cloudreve/Cloudreve/v4.
| Package | Affected | Fixed in |
|---|---|---|
github.com/cloudreve/Cloudreve/v3 Go | All versions | None |
github.com/cloudreve/Cloudreve/v3 Go | All versions to 3.0.0-20250225100611-da4e44b77af4 | None |
github.com/cloudreve/Cloudreve/v3 Go | All versions to 3.0.0-20250225100611-da4e44b77af4 | None |
github.com/cloudreve/Cloudreve Go | All versions | None |
github.com/cloudreve/Cloudreve/v4 Go | All versions | 4.0.0-20260606025411-aaebf317a78f |
github.com/cloudreve/Cloudreve/v4 Go | All versions | 4.0.0-20260606025411-aaebf317a78f |
1 more packages
github.com/cloudreve/Cloudreve/v4 Go | All versions | 4.0.0-20260606025411-aaebf317a78f |
How do I fix CVE-2026-54562?
Upgrade to a fixed version.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-54562 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-54562 exists.
Sources
Also known as GHSA-x756-g4x3-c64m, GO-2026-6023.