{"id":"CVE-2026-25923","summary":"Phar Deserialization leading to Arbitrary File Deletion in my little forum","details":"my little forum is a PHP and MySQL based internet forum that displays the messages in classical threaded view. Prior to 20260208.1, the application fails to filter the phar:// protocol in URL validation, allowing attackers to upload a malicious Phar Polyglot file (disguised as JPEG) via the image upload feature, trigger Phar deserialization through BBCode [img] tag processing, and exploit Smarty 4.1.0 POP chain to achieve arbitrary file deletion. This vulnerability is fixed in 20260208.1.","aliases":["GHSA-wr9p-3c3g-78fw"],"modified":"2026-08-27T03:31:04.566657037Z","published":"2026-02-09T21:56:02.862Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-434","CWE-502"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25923.json"},"references":[{"type":"WEB","url":"https://github.com/My-Little-Forum/mylittleforum/releases/tag/20260208.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25923.json"},{"type":"ADVISORY","url":"https://github.com/My-Little-Forum/mylittleforum/security/advisories/GHSA-wr9p-3c3g-78fw"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-25923"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/my-little-forum/mylittleforum","events":[{"introduced":"0"},{"fixed":"a8fc667ece9301506a739fd62dc2b444e8485a22"}],"database_specific":{"cpe":"cpe:2.3:a:mylittleforum:my_little_forum:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"20260208.1"}],"source":["AFFECTED_FIELD","CPE_RANGE","REFERENCES"]}}],"versions":["20251129.1","20251021.1","20251010.1","20250921.1","20250422.1","20250323.1","20241215.1","20240827.1","20240729.1","20220803.1","20220529.1","20220517.1","20220509.1","20220508.1","2.4.99.3","2.4.99.1","2.4.8","2.4.7","2.4.6","2.4.5","2.4.4","2.4.3","2.4.2","2.4.1","v2.4","2.4","v2.3.99.3","2.3.99.3","v2.3.99.2","v2.3.7","v2.3.7beta2","v2.3.7beta","v2.3.6.1","v2.3.6","v2.3.5","v2.3.4","v2.3.3","v2.3.2","v2.3","v2.2.8","v2.2.7","v2.2.6","v2.2.5","v2.2.4","v2.2.3","v2.2.2","v2.2.1","v2.2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-25923.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}