CVE-2025-8344
Published: 31 July 2025
Summary
CVE-2025-8344 is a low-severity Improper Access Control (CWE-284) vulnerability in Viglet Shio. Its CVSS base score is 2.1 (Low).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 23.7th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified are NIST 800-53 AC-3 (Access Enforcement) and SI-10 (Information Input Validation).
Deeper analysis
CVE-2025-8344 is a critical vulnerability in openviglet shio versions up to 0.3.8, affecting the shStaticFileUpload function in the file shio-app/src/main/java/com/viglet/shio/api/staticfile/ShStaticFileAPI.java. The issue arises from manipulation of the filename argument, enabling unrestricted file upload. It is remotely exploitable and has been assigned a CVSS v3.1 base score of 6.3 (AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L), with associated CWEs CWE-284 (Improper Access Control) and CWE-434 (Unrestricted Upload of File with Dangerous Type). The vulnerability was published on 2025-07-31.
An attacker with low-privilege remote access (PR:L) can exploit this vulnerability without user interaction by manipulating the filename parameter during file upload operations. Successful exploitation allows limited impact across confidentiality, integrity, and availability (C:L/I:L/A:L), potentially enabling the upload of malicious files that could lead to further compromise depending on server configuration and application context.
Advisories and details are documented in GitHub issues at https://github.com/openviglet/shio/issues/1029 and https://github.com/openviglet/shio/issues/1029#issue-3239422554, as well as VulDB entries at https://vuldb.com/?ctiid.318294, https://vuldb.com/?id.318294, and https://vuldb.com/?submit.617680. The exploit has been publicly disclosed and may be used by attackers.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-23222
Vulnerability details
A vulnerability classified as critical has been found in openviglet shio up to 0.3.8. Affected is the function shStaticFileUpload of the file shio-app/src/main/java/com/viglet/shio/api/staticfile/ShStaticFileAPI.java. The manipulation of the argument filename leads to unrestricted upload. It is possible to launch the attack…
more
remotely. The exploit has been disclosed to the public and may be used.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Unrestricted file upload (CWE-434) in a public-facing web app directly enables remote exploitation (T1190) and deployment of web shells (T1100) via malicious filename manipulation.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires validation of filename and file-type inputs to the shStaticFileUpload function, blocking unrestricted dangerous uploads.
Enforces access-control policy on the upload endpoint so only permitted file types and users can succeed, addressing the CWE-284 improper access control root cause.
Malicious-code scanning at the upload boundary can detect and block dangerous file types even when filename validation is absent.