Vulnerability · Published Sep 18, 2026 · Assigned by hackerone
CVE-2026-68493
Low 3.1
In plain English
A low-severity authorization bypass via user-controlled key in Server from Nextcloud. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities).
Severity (CVSS 3.0)3.1Low
Exploit odds (30 days)0.2%top 86.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
Weakness: CWE-639 · Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N