USS Upyun: Cross-site request forgery
USS Upyun is affected by cross-site request forgery. The vulnerable path is reachable without authentication. Exploitation relies on a signed-in privileged user submitting an attacker-controlled request.
- Component
- USS Upyun
- Plugin slug
uss-upyun- Affected
- See vendor advisory
- Safe version
- See mitigation notes
- Published
- Sep 17, 2025
This CVE was published Sep 17, 2025 and is one of 1 known issue for this plugin.
Update, patch or deactivate.
Update USS Upyun to a release outside the affected range, or disable and remove it until a fixed version is available.
No confirmed safe version is listed. Consider a vendor-supported patch or temporarily restricting the affected functionality while you assess the risk.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical description
The USS Upyun plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.5.0. This is due to missing or incorrect nonce validation on the uss_setting_page function when processing the uss_set form type. This makes it possible for unauthenticated attackers to modify critical Upyun cloud storage settings including bucket name, operator credentials, upload paths, and image processing parameters via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.
CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N