sz-boot-parent: Unrestricted Upload of File with Dangerous Type
CVE-2026-3187 is a critical-severity unrestricted upload of file with dangerous type vulnerability in sz-boot-parent from Feiyuchuixue, 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 sz-boot-parent versions: 1.3.2-beta. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.36% 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 sz-boot-parent 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 |
|---|---|---|---|
| Feiyuchuixue | sz-boot-parent | 1.3.2-beta | 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 | 2.1 | Low | CNA (vuldb.com) |
| CVSS 3.1 | 6.3 | Medium | CNA (vuldb.com) |
| CVSS 3.1 | 9.8 | Critical | NVD |
| CVSS 2.0 | 6.5 | Medium | CNA (vuldb.com) |
Official description
A vulnerability was identified in feiyuchuixue sz-boot-parent up to 1.3.2-beta. Affected by this issue is some unknown functionality of the file /api/admin/sys-file/upload of the component API Endpoint. Such manipulation leads to unrestricted upload. The attack may be launched remotely. The exploit is publicly available and might be used. Upgrading to version 1.3.3-beta can resolve this issue. The name of the patch is aefaabfd7527188bfba3c8c9eee17c316d094802. Upgrading the affected component is recommended. The project was informed beforehand and acted very professional: "We have introduced a whitelist restriction on the /api/admin/sys-file/upload endpoint via the oss.allowedExts and oss.allowedMimeTypes configuration options, allowing the specification of permitted file extensions and MIME types for uploads."
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Unrestricted Upload of File with Dangerous Type
The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.
How developers prevent this class of flaw
- Generate a new, unique filename for an uploaded file instead of using the user-supplied filename, so that no external input is used at all.
- When the set of acceptable objects, such as filenames or URLs, is limited or known, create a mapping from a set of fixed input values (such as numeric IDs) to the actual filenames or URLs, and reject all other inputs.
- Consider storing the uploaded files outside of the web document root entirely. Then, use other mechanisms to deliver the files dynamically.
More Unrestricted Upload of File with Dangerous Type vulnerabilities (CWE-434)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: poc, automatable: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
Third-party and government advisories
- vuldb.com/?id.347745Third Party Advisory, VDB Entry
- vuldb.com/?submit.754038Third Party Advisory, VDB Entry
Technical write-ups (may include proof of concept)
- github.com/yuccun/CVE/blob/main/sz-boot-parent-Arbitrary_File_Upload.mdExploit, Third Party Advisory
Other references
- github.com/feiyuchuixue/sz-boot-parent/Product
- vuldb.com/?ctiid.347745Permissions Required, VDB Entry
Recent Unrestricted Upload of File with Dangerous Type vulnerabilities
- 9.6 Critical severity
- 8.8 High severity
- 7.2 High severity
- 9.8 Critical severity
- 8.8 High severity
- 9.9 Critical severity
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