CVE-2025-53828 owncloud CVE debrief

Who should care

Administrators and users of SharePoint for ownCloud, especially those with administrative privileges, should be aware of this vulnerability and take immediate action to upgrade to the fixed version. Additionally, security teams and vulnerability management teams should prioritize this vulnerability due to its high severity and potential impact on system security.

Technical summary

The vulnerability is caused by a SSRF vulnerability in the SharePoint app, which allows an attacker with administrative privileges to execute arbitrary code on the system. The vulnerability has a CVSS score of 8.5 and a severity of HIGH. This SSRF vulnerability can be used to bypass security restrictions and execute malicious code, potentially leading to a complete compromise of the system. Affected versions of SharePoint for ownCloud prior to 0.4.1, corresponding to ownCloud 10 prior to 10.15.3, should be upgraded to prevent exploitation.

Defensive priority

High

Recommended defensive actions

• Upgrade ownCloud 10 to version 10.15.3 or later to receive SharePoint for ownCloud 0.4.1, the fixed version.
• Restrict administrative privileges to trusted users.
• Monitor system logs for suspicious activity.
• Implement additional security measures, such as network segmentation and access controls.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The vulnerability is documented in the CVE record and the NVD detail page. The CVE record was published on 2026-07-06T16:16:26.903Z and last modified on 2026-07-07T15:16:42.070Z. The NVD entry is currently Deferred. Evidence of the vulnerability's existence and impact is limited to the information provided in these sources, and further verification is necessary to confirm affected scope and severity.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.