Vulnerability · Published Jun 1, 2026 · Assigned by GitHub_M

CVE-2026-45275Nextcloud: Authorization bypass in approval feature allows unauthorized file sharing with approvers

Medium 6.5

In plain English

A medium-severity security flaw in security-advisories from nextcloud. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.4%top 70.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Nextcloud is an open source content collaboration platform. Prior to version 2.7.2, a privilege escalation vulnerability exists in the Approval app that allows a user without sharing permissions to force the system to share a file with approvers. This results in an authorization bypass and privilege escalation, allowing unauthorized distribution of restricted files. This issue has been patched in version 2.7.2.

Affected products (as reported)

Vendor	Product	Versions
nextcloud	security-advisories	< 2.7.2

Weakness: CWE-285 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-v8q8-w6c3-3gv9 x_refsource_CONFIRM
https://github.com/nextcloud/approval/pull/392 x_refsource_MISC
https://hackerone.com/reports/3593780 x_refsource_MISC