How severe is CVE-2025-53829?

CVE-2025-53829 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over network with high attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-53829 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-53829?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2025-53829 published?

CVE-2025-53829 was published on 2026-07-06 and last updated on 2026-07-08.

CVE-2025-53829

CVE-2025-53829 is a high-severity vulnerability with a CVSS 3.x base score of 8.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-23.

Key facts

Severity: High (CVSS 3.x base score 8.0)
EPSS exploit prediction: 0% (25th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-23
Published: 2026-07-06
Last modified: 2026-07-08

Description

ownCloud is a file storage, synchronization, and sharing application. In ownCloud 10 prior to version 10.15.3, an attacker with administrative privileges can exploit a path traversal vulnerability in the system to execute arbitrary code. Upgrade ownCloud 10 to version 10.15.3 or later to receive a patch.

Frequently asked questions

What is CVE-2025-53829?: ownCloud is a file storage, synchronization, and sharing application. In ownCloud 10 prior to version 10.15.3, an attacker with administrative privileges can exploit a path traversal vulnerability in the system to execute arbitrary code. Upgrade ownCloud 10 to version 10.15.3 or later to receive a patch.
How severe is CVE-2025-53829?: CVE-2025-53829 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over network with high attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-53829 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-53829?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2025-53829 published?: CVE-2025-53829 was published on 2026-07-06 and last updated on 2026-07-08.

References

https://github.com/owncloud/security-advisories/security/advisories/GHSA-4439-4wxm-c9px

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