CVE-2025-8838
Published: 11 August 2025
Summary
CVE-2025-8838 is a high-severity Improper Authentication (CWE-287) vulnerability in Winterchens My-Site. Its CVSS base score is 7.3 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 35.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Threat & Defense at a Glance
Threat & Defense Details
Likely Mitigating ControlsAI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Detects unauthorized successful logons resulting from improper authentication implementations.
Documented procedures ensure personnel are trained on authentication mechanisms, tangibly lowering the risk of improper authentication being exploited.
Security awareness training instructs users on secure authentication practices and avoiding credential compromise.
Training on authentication mechanisms and best practices decreases the occurrence of improper authentication.
Non-repudiation requires strong authentication mechanisms to irrefutably attribute performed actions to specific individuals or processes.
Session content review can reveal authentication bypasses or failures in session establishment.
Review of authentication-related audit records can detect improper authentication mechanisms or bypasses.
Assessments check authentication mechanisms for correct implementation and effectiveness, reducing successful authentication bypass attempts.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Improper authentication bypass in public-facing /admin backend interface directly enables remote exploitation of a web application vulnerability.
NVD Description
A vulnerability has been found in WinterChenS my-site up to 1f7525f15934d9d6a278de967f6ec9f1757738d8. This vulnerability affects the function preHandle of the file /admin/ of the component Backend Interface. The manipulation of the argument uri leads to improper authentication. The attack can be…
more
initiated remotely. The exploit has been disclosed to the public and may be used. The real existence of this vulnerability is still doubted at the moment. This product is using a rolling release to provide continious delivery. Therefore, no version details for affected nor updated releases are available. The code maintainer responded to the issue that "[he] tried it, and using this link automatically redirects to the login page."
Deeper analysisAI
CVE-2025-8838 is an improper authentication vulnerability (CWE-287) in the WinterChenS my-site project, affecting commits up to 1f7525f15934d9d6a278de967f6ec9f1757738d8. The issue resides in the preHandle function within the /admin/ Backend Interface component, where manipulation of the uri argument bypasses authentication checks. This flaw carries a CVSS v3.1 base score of 7.3 (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L), indicating high severity due to its network accessibility and low complexity.
The vulnerability can be exploited remotely by unauthenticated attackers with no privileges required and no user interaction needed. Successful exploitation allows limited impacts on confidentiality, integrity, and availability, potentially enabling unauthorized access to backend administrative functions through crafted URI manipulations. An exploit has been publicly disclosed, though its practical reliability remains in question.
Advisories from VulDB and GitHub issue #97 detail the report, with the project maintainer responding that testing the reported link results in an automatic redirect to the login page, suggesting the issue may not function as claimed. As my-site employs a rolling release model for continuous delivery, no specific affected or patched versions are available; practitioners should monitor the repository for updates.
Notable context includes ongoing doubt about the vulnerability's validity, as confirmed by the maintainer's reproduction attempts, with no evidence of real-world exploitation reported to date.
Details
- CWE(s)