CVE-2026-45810Network attack vector

Authenticated comment disclosure via unchecked object relation

Published Jun 1, 2026 · Updated Jun 1, 2026

Authorization bypass in Nextcloud Server 31.0.0 through 31.0.11 and 32.0.0 through 32.0.2 allows remote authenticated users to read all comments. The DAV comments EntityCollection getChild and childExists methods fetched an attacker-supplied comment ID without verifying that its object type and object ID matched the requested file. An authenticated account with access to one file comment can request another comment ID through PROPFIND, exposing comment contents without access to the associated file; no write or service-interruption impact is reported.

CVSS severity6.8
Medium
EPSS probability0.25%
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 Server 31.0.0 through 31.0.11 and 32.0.0 through 32.0.2 allows remote authenticated users to read all comments. The DAV comments EntityCollection getChild and childExists methods fetched an attacker-supplied comment ID without verifying that its object type and object ID matched the requested file. An authenticated account with access to one file comment can request another comment ID through PROPFIND, exposing comment contents without access to the associated file; no write or service-interruption impact is reported.

The record

CVE
CVE-2026-45810
Published
Jun 1, 2026
Updated
Jun 1, 2026
Vendor
Nextcloud GmbH
Product
Security Advisories
Classifications
CWE-639, T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=>= 31.0.0, < 31.0.12
  2. Affected versionversion=>= 32.0.0, < 32.0.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Nextcloud GmbH · Security Advisoriesversion=>= 31.0.0, < 31.0.12; version=>= 32.0.0, < 32.0.3

Published CVSS scores

6.8GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
T1213Data from Information Repositories

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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