{"cve":{"cve_id":"CVE-2026-34590","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":0.00226,"epss_percentile":0.13012,"epss_as_of":"2026-06-23","description":"Postiz is an AI social media scheduling tool. Prior to version 2.21.4, the POST /webhooks/ endpoint for creating webhooks uses WebhooksDto which validates the url field with only @IsUrl() (format check), missing the @IsSafeWebhookUrl validator that blocks internal/private network addresses. The update (PUT /webhooks/) and test (POST /webhooks/send) endpoints correctly apply @IsSafeWebhookUrl. When a post is published, the orchestrator fetches the stored webhook URL without runtime validation, enabling blind SSRF against internal services. This issue has been patched in version 2.21.4.","published_at":"2026-04-02T17:26:58.902000Z","last_modified_at":null,"cvss_v3_score":5.4,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/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/gitroomhq/postiz-app/security/advisories/GHSA-wc9c-7cv8-m225","https://github.com/gitroomhq/postiz-app/commit/5ae4c950db6aa516a31454b7a45b9480bca40a11","https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.4"],"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":"2026-06-28T23:29:59.294327Z"},"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":"L","value_label":"Low"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"L","value_label":"Low"},{"metric":"I","name":"Integrity","value":"L","value_label":"Low"},{"metric":"A","name":"Availability","value":"N","value_label":"None"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"gitroomhq","vendor_name":"gitroomhq","product_slug":"postiz-app","product_name":"postiz-app","version_start":"< 2.21.4","version_start_inclusive":true,"version_end":"< 2.21.4","version_end_inclusive":true,"cpe23_uri":"cve5:gitroomhq:postiz-app:< 2.21.4:< 2.21.4"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-wc9c-7cv8-m225","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://github.com/gitroomhq/postiz-app/commit/5ae4c950db6aa516a31454b7a45b9480bca40a11","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.4","source_type":"PATCH","tags":["patch"]}],"timeline":[{"type":"published","at":"2026-04-02T17:26:58.902000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:53:26.161903Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:53:26.161903Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:53:26.161903Z","label":"CVSS score revised","source":"cvelistv5"}]}