What is CVE-2025-0526?

CVE-2025-0526 is a medium-severity vulnerability in Microsoft Windows, classified under Missing Authorization. CVSS score: 5.4/10. Published 2025-02-11.

How severe is CVE-2025-0526?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Auth bypass in Microsoft Windows

CVE-2025-0526

In affected versions of Octopus Deploy it was possible to upload files to unexpected locations on the host using an API endpoint. The field lacked validation which could potentially result in ways to circumvent expected workflows.

Vulnerability class: Broken Access Control

Published 2025-02-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L.

EPSS exploit prediction

EPSS: 0.004 (26.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 26.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.000

Affected products

Microsoft Windows
Octopus Server
Octopus Deploy Server — versions 2022.4.791, 2024.4.401

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

advisories.octopus.com/post/2024/sa2025-03/ (Broken Link)
af854a3a-2127-422b-91ae-364da2661108 (Vendor Advisory)

Frequently asked questions

What is CVE-2025-0526?: CVE-2025-0526 is a medium-severity vulnerability in Microsoft Windows, classified under Missing Authorization. CVSS score: 5.4/10. Published 2025-02-11.
How severe is CVE-2025-0526?: Medium severity. CVSS v3 base score is 5.4 out of 10.