PowerCMS: Unrestricted Upload of File with Dangerous Type
CVE-2025-54757 is a high-severity unrestricted upload of file with dangerous type vulnerability in PowerCMS from Alfasado, with a CVSS 3.1 base score of 8.0 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, but only if a user takes part, for example by opening a link or file. Affected PowerCMS versions: 6.7 and earlier (PowerCMS 6.x series); 5.3 and earlier (PowerCMS 5.x series); 4.6 and earlier (PowerCMS 4.x series). The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.25% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of PowerCMS you run against the affected versions below, and install the vendor's latest release.
- Read the advisory on powercms.jp for workarounds and exact fixed builds.
- Because the attack needs a user to take part, warn users about unexpected links and files related to this product until it is patched.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Alfasado | PowerCMS | 6.7 and earlier (PowerCMS 6.x series); 5.3 and earlier (PowerCMS 5.x series); 4.6 and earlier (PowerCMS 4.x series) | 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
- LowA basic user account is enough.
- User interaction
- RequiredA user must take an action such as opening a file or link.
- 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:L/UI:R/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 5.1 | Medium | CNA (jpcert.or.jp) |
| CVSS 3.1 | 6.5 | Medium | CNA (jpcert.or.jp) |
| CVSS 3.1 | 8.0 | High | NVD |
Official description
Multiple versions of PowerCMS allow unrestricted upload of dangerous files. If a product administrator accesses a malicious file uploaded by a product user, an arbitrary script may be executed on the browser.
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: none, automatable: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Third-party and government advisories
- jvn.jp/en/vu/JVNVU93412964/Third Party Advisory
Other vulnerabilities in PowerCMS
- 8.0 High severity
- 7.2 High severity
- 9.8 Critical severity
Recent Unrestricted Upload of File with Dangerous Type vulnerabilities
- 8.8 High severity
- 8.8 High severity
- 9.8 Critical severity
- 9.8 Critical severity
- 8.5 High severity
- 8.8 High severity
Spotted an error? Tell us.