CVE-2025-66513Network attack vector

Share metadata disclosure via unchecked numeric identifiers

Published Dec 5, 2025 · Updated Dec 5, 2025

Authorization bypass in Nextcloud Tables before 0.8.9, 0.9.6, and 1.0.1 allows remote attackers to read table-sharing metadata. The getShare API accepts a user-controlled numeric share ID and returns the matching table, recipients, and permissions without enforcing manage access. Network reachability and victim interaction are required; disclosure is limited to share relationships and permission settings.

CVSS severity4.3
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in Nextcloud Tables before 0.8.9, 0.9.6, and 1.0.1 allows remote attackers to read table-sharing metadata. The getShare API accepts a user-controlled numeric share ID and returns the matching table, recipients, and permissions without enforcing manage access. Network reachability and victim interaction are required; disclosure is limited to share relationships and permission settings.

The record

CVE
CVE-2025-66513
Published
Dec 5, 2025
Updated
Dec 5, 2025
Vendor
Nextcloud GmbH
Product
Security Advisories
Classifications
CWE-639, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 5, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 5, 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=< 0.8.9
  2. Affected versionversion=>= 0.9.0-beta.1, < 0.9.6
  3. Affected versionversion=>= 1.0.0-beta.1, < 1.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Nextcloud GmbH · Security Advisoriesversion=< 0.8.9; version=>= 0.9.0-beta.1, < 0.9.6; version=>= 1.0.0-beta.1, < 1.0.1

Published CVSS scores

4.3GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
5.3NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
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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