{"cve":{"cve_id":"CVE-2023-3545","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.01963,"epss_percentile":0.77756,"epss_as_of":"2026-06-23","description":"Improper sanitisation in `main/inc/lib/fileUpload.lib.php` in Chamilo LMS <= v1.11.20 on Windows and Apache installations allows unauthenticated attackers to bypass file upload security protections and obtain remote code execution via uploading of `.htaccess` file. This vulnerability may be exploited by privileged attackers or chained with unauthenticated arbitrary file write vulnerabilities, such as CVE-2023-3533, to achieve remote code execution.","published_at":"2023-11-28T07:07:27.183000Z","last_modified_at":null,"cvss_v3_score":9.8,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvss_v3_severity":"CRITICAL","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-178"],"nvd_references":["https://support.chamilo.org/projects/chamilo-18/wiki/security_issues#Issue-125-2023-07-13-Critical-impact-Moderate-risk-Htaccess-File-Upload-Security-Bypass-on-Windows-CVE-2023-3545","https://starlabs.sg/advisories/23/23-3545/","https://github.com/chamilo/chamilo-lms/commit/dc7bfce429fbd843a95a57c184b6992c4d709549"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-06-28T23:20:12.632148Z"},"effective_severity":"CRITICAL","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"chamilo","vendor_name":"chamilo","product_slug":"chamilo","product_name":"Chamilo","version_start":"0","version_start_inclusive":true,"version_end":"1.11.20","version_end_inclusive":true,"cpe23_uri":"cve5:chamilo:chamilo:0:1.11.20"}],"exploit_refs":[],"news":[],"references":[{"url":"https://support.chamilo.org/projects/chamilo-18/wiki/security_issues#Issue-125-2023-07-13-Critical-impact-Moderate-risk-Htaccess-File-Upload-Security-Bypass-on-Windows-CVE-2023-3545","source_type":"MISC","tags":[]},{"url":"https://starlabs.sg/advisories/23/23-3545/","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://github.com/chamilo/chamilo-lms/commit/dc7bfce429fbd843a95a57c184b6992c4d709549","source_type":"PATCH","tags":["patch"]}],"timeline":[{"type":"published","at":"2023-11-28T07:07:27.183000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:29:32.763511Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:29:32.763511Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:29:32.763511Z","label":"CVSS score revised","source":"cvelistv5"}]}