---
id: CVE-2026-68493
title: >-
  After guessing a 62^15 complex unique identifier, a malicious logged in user
  was able to retrieve a list of memberships for a circle they are not a member
  of.
summary: >-
  After guessing a 62^15 complex unique identifier, a malicious logged in user
  was able to retrieve a list of memberships for a circle they are not a member
  of.
severity: low
cvss: 3.1
cvssVector: 'CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-639
vendor: Nextcloud
product: Server
affected:
  - Server >= 32.0.0 <= 34.0.0
published: '2026-09-18'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T20:17:21.037'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-68493'
references:
  - url: 'https://hackerone.com/reports/3484601'
    label: support@hackerone.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68493.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-68493'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-68493'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-18T19:40:01.086889Z'
epss: 0.00227
epssPercentile: 0.11998
ingestedAt: '2026-09-18T01:33:24.272Z'
---

## Overview

After guessing a 62^15 complex unique identifier, a malicious logged in user was able to retrieve a list of memberships for a circle they are not a member of.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · updated 2026-09-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68493.json)