{"cve":{"cve_id":"CVE-2026-23845","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":0.00396,"epss_percentile":0.31264,"epss_as_of":"2026-06-23","description":"Mailpit is an email testing tool and API for developers. Versions prior to 1.28.3 are vulnerable to Server-Side Request Forgery (SSRF) via HTML Check CSS Download. The HTML Check feature (`/api/v1/message/{ID}/html-check`) is designed to analyze HTML emails for compatibility. During this process, the `inlineRemoteCSS()` function automatically downloads CSS files from external `<link rel=\"stylesheet\" href=\"...\">` tags to inline them for testing. Version 1.28.3 fixes the issue.","published_at":"2026-01-19T19:01:38.163000Z","last_modified_at":null,"cvss_v3_score":5.8,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N","cvss_v3_severity":"MEDIUM","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-918"],"nvd_references":["https://github.com/axllent/mailpit/security/advisories/GHSA-6jxm-fv7w-rw5j","https://github.com/axllent/mailpit/commit/1679a0aba592ebc8487a996d37fea8318c984dfe","https://github.com/axllent/mailpit/releases/tag/v1.28.3"],"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":"2026-06-28T23:29:18.510865Z"},"effective_severity":"MEDIUM","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":"C","value_label":"Changed"},{"metric":"C","name":"Confidentiality","value":"L","value_label":"Low"},{"metric":"I","name":"Integrity","value":"N","value_label":"None"},{"metric":"A","name":"Availability","value":"N","value_label":"None"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"axllent","vendor_name":"axllent","product_slug":"mailpit","product_name":"mailpit","version_start":"< 1.28.3","version_start_inclusive":true,"version_end":"< 1.28.3","version_end_inclusive":true,"cpe23_uri":"cve5:axllent:mailpit:< 1.28.3:< 1.28.3"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/axllent/mailpit/security/advisories/GHSA-6jxm-fv7w-rw5j","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://github.com/axllent/mailpit/commit/1679a0aba592ebc8487a996d37fea8318c984dfe","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/axllent/mailpit/releases/tag/v1.28.3","source_type":"PATCH","tags":["patch"]}],"timeline":[{"type":"published","at":"2026-01-19T19:01:38.163000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:51:54.153642Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:51:54.153642Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:51:54.153642Z","label":"CVSS score revised","source":"cvelistv5"}]}