CVE-2025-31103
Published: 31 March 2025
Summary
CVE-2025-31103 is a high-severity Deserialization of Untrusted Data (CWE-502) vulnerability in Appleple A-Blog Cms. Its CVSS base score is 7.5 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 27.3% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).
Deeper analysis
CVE-2025-31103, published on 2025-03-31, is an untrusted data deserialization vulnerability in a-blog CMS, classified under CWE-502. The flaw allows processing of a specially crafted request to store arbitrary files on the server where the product is running. This can be leveraged to execute arbitrary scripts on the server, earning a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N).
Unauthenticated attackers can exploit the vulnerability remotely over the network with low attack complexity and no user interaction required. Successful exploitation enables arbitrary file storage and subsequent script execution on the server, resulting in high integrity impact without affecting confidentiality or availability.
Vendor advisories at https://developer.a-blogcms.jp/blog/news/entry-4197.html and https://developer.a-blogcms.jp/blog/news/security-update202503.html, along with JVN details at https://jvn.jp/en/jp/JVN66982699/, provide information on security updates and mitigation steps.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-14787
Vulnerability details
Untrusted data deserialization vulnerability exists in a-blog cms. Processing a specially crafted request may store arbitrary files on the server where the product is running. This can be leveraged to execute an arbitrary script on the server.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
The unauthenticated remote deserialization flaw in public-facing a-blog CMS directly enables exploitation of the web application (T1190) and deployment of arbitrary scripts/files for server-side execution (T1505.003).
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Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly remediates the untrusted data deserialization vulnerability by applying vendor security updates that patch the flaw in a-blog CMS.
Validates specially crafted requests containing malicious deserialization payloads before processing to prevent arbitrary file storage.
Performs integrity checks on software and files to detect unauthorized arbitrary file storage and subsequent script execution resulting from the deserialization flaw.