{"cve":{"cve_id":"CVE-2026-42556","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":0.00258,"epss_percentile":0.16919,"epss_as_of":"2026-06-23","description":"Postiz is an AI social media scheduling tool. From version 2.21.6 to before version 2.21.7, any authenticated user who can create a post can store arbitrary HTML in post content by tampering their own save request and send the public preview link /p/<postId>?share=true to another user. The preview page renders that stored HTML with dangerouslySetInnerHTML on the main application origin. This issue has been patched in version 2.21.7.","published_at":"2026-05-08T22:28:33.086000Z","last_modified_at":null,"cvss_v3_score":8.9,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L","cvss_v3_severity":"HIGH","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-79"],"nvd_references":["https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-hhxq-3wg7-4rj8","https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.7"],"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":"2026-06-28T23:30:20.145142Z"},"effective_severity":"HIGH","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":"L","value_label":"Low"},{"metric":"UI","name":"User Interaction","value":"R","value_label":"Required"},{"metric":"S","name":"Scope","value":"C","value_label":"Changed"},{"metric":"C","name":"Confidentiality","value":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"L","value_label":"Low"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"gitroomhq","vendor_name":"gitroomhq","product_slug":"postiz-app","product_name":"postiz-app","version_start":">= 2.21.6, < 2.21.7","version_start_inclusive":true,"version_end":">= 2.21.6, < 2.21.7","version_end_inclusive":true,"cpe23_uri":"cve5:gitroomhq:postiz-app:>= 2.21.6, < 2.21.7:>= 2.21.6, < 2.21.7"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-hhxq-3wg7-4rj8","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.7","source_type":"PATCH","tags":["patch"]}],"timeline":[{"type":"published","at":"2026-05-08T22:28:33.086000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:54:12.493575Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:54:12.493575Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:54:12.493575Z","label":"CVSS score revised","source":"cvelistv5"}]}