CVE-2025-47791

Service interruption via unrestricted share-recipient proxying

Published May 16, 2025 · Updated May 16, 2025

SSRF in affected Nextcloud Server and Nextcloud Enterprise Server releases allows remote attackers to proxy requests through a public endpoint. The public ExternalSharesController::testRemote action prepends HTTP or HTTPS to an attacker-supplied host and issues up to six GET requests to fixed paths without restricting the destination. No authentication is required, but adjacent-network access is required; repeated abuse can consume server resources and interrupt service.

CVSS severity4.3
Medium
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in affected Nextcloud Server and Nextcloud Enterprise Server releases allows remote attackers to proxy requests through a public endpoint. The public ExternalSharesController::testRemote action prepends HTTP or HTTPS to an attacker-supplied host and issues up to six GET requests to fixed paths without restricting the destination. No authentication is required, but adjacent-network access is required; repeated abuse can consume server resources and interrupt service.

The record

CVE
CVE-2025-47791
Published
May 16, 2025
Updated
May 16, 2025
Vendor
Nextcloud GmbH
Product
Security Advisories
Classifications
CWE-918, T1190
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 16, 2025CVE publishedPublication date reported by the CVE source.
  2. May 16, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 28.0.0, < 28.0.13
  2. Affected versionversion=>= 29.0.0, < 29.0.10
  3. Affected versionversion=>= 30.0.0, < 30.0.3

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Nextcloud GmbH · Security Advisoriesversion=>= 28.0.0, < 28.0.13; version=>= 29.0.0, < 29.0.10; version=>= 30.0.0, < 30.0.3

Published CVSS scores

4.3GitHubCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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