my-site: Improper Authentication
CVE-2025-8838 is a critical-severity improper authentication vulnerability in my-site from WinterChenS, with a CVSS 3.1 base score of 9.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected my-site versions: 1f7525f15934d9d6a278de967f6ec9f1757738d8. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.61% chance of exploitation within 30 days, which is low compared with other CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Check which version of my-site you run against the affected versions below, and install the vendor's latest release.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| WinterChenS | my-site | 1f7525f15934d9d6a278de967f6ec9f1757738d8 | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 5.5 | Medium | CNA (vuldb.com) |
| CVSS 3.1 | 7.3 | High | CNA (vuldb.com) |
| CVSS 3.1 | 9.8 | Critical | NVD |
| CVSS 2.0 | 7.5 | High | CNA (vuldb.com) |
Official 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 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."
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Authentication
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
How developers prevent this class of flaw
- Use an authentication framework or library such as the OWASP ESAPI Authentication feature.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: poc, automatable: yes, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Third-party and government advisories
- vuldb.com/?id.319372Third Party Advisory, VDB Entry
- vuldb.com/?submit.622421Third Party Advisory, VDB Entry
Technical write-ups (may include proof of concept)
- github.com/WinterChenS/my-site/issues/97Exploit, Issue Tracking
Other references
- github.com/WinterChenS/my-site/issues/97#issuecomment-2986947791Issue Tracking
- github.com/WinterChenS/my-site/issues/97#issuecomment-2987091571Issue Tracking
- vuldb.com/?ctiid.319372Permissions Required, VDB Entry
Other vulnerabilities in my-site
- 7.5 High severity
- 9.8 Critical severity
Recent Improper Authentication vulnerabilities
- 8.7 High severity
- 8.0 High severity
- 7.5 High severity
- 8.1 High severity
- 10.0 Critical severity
- 9.8 Critical severity
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