Vulnerability · Published Jul 6, 2026 · Assigned by GitHub_M

CVE-2025-53827ownCloud Core: Updater has an exposed dangerous method or function

Critical 9.1

In plain English

A critical-severity security flaw in ownCloud Core from owncloud. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities).

Severity (CVSS 3.1)9.1Critical

Exploit odds (30 days)0.6%top 50.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

ownCloud Core is the server-side component of the file storage, synchronization, and sharing application ownCloud Classic. In versions prior to 10.15.3, the Updater on ownCloud 10 before 10.15.3 has an exposed dangerous method or function. Attackers with administrative privileges may leverage functionality to execute arbitrary code. This issue has been fixed in version 10.15.3.

Affected products (as reported)

Vendor	Product	Versions
owncloud	ownCloud Core	< 10.15.3

Weakness: CWE-749 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

References

https://github.com/owncloud/security-advisories/security/advisories/GHSA-hvcx-ph66-mmvw x_refsource_CONFIRM