{"id":"CVE-2026-34590","summary":"Postiz: SSRF via Webhook Creation Endpoint Missing URL Safety Validation","details":"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.","aliases":["GHSA-wc9c-7cv8-m225"],"modified":"2026-07-08T08:12:51.170410133Z","published":"2026-04-02T17:26:58.902Z","database_specific":{"cwe_ids":["CWE-918"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34590.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34590.json"},{"type":"ADVISORY","url":"https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-wc9c-7cv8-m225"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34590"},{"type":"FIX","url":"https://github.com/gitroomhq/postiz-app/commit/5ae4c950db6aa516a31454b7a45b9480bca40a11"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/gitroomhq/postiz-app","events":[{"introduced":"0"},{"fixed":"5ae4c950db6aa516a31454b7a45b9480bca40a11"}],"database_specific":{"cpe":"cpe:2.3:a:gitroom:postiz:*:*:*:*:*:*:*:*","source":["AFFECTED_FIELD","CPE_RANGE","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"2.21.4"}]}}],"versions":["v2.21.3","v2.21.2","v2.21.1","v2.21.0","v2.20.2","v2.20.1","v2.20.0","v2.19.0","v2.18.0","v2.17.0","v2.16.0","v2.15.1","v2.15.0","v2.14.0","v2.13.0","v2.12.1","v2.12.0","v2.11.3","v2.11.1","v2.11.0","v2.10.1","v2.10.0","v2.9.0","v2.8.3","v2.8.2","v2.8.1","v2.8.0","v2.7.0","v2.6.4","v2.6.3","v2.6.2","v2.6.1","v2.5.4","v2.5.3","v2.4.3","v2.5.2","v2.5.1","v2.5.0","v2.4.2","v2.4.1","v2.4.0","v2.3.1","v2.3.0","v2.2.5","v2.2.4","v2.2.3","v2.2.1","v2.2.0","v2.1.2","v2.1.1","v2.0.8","v2.0.7","v2.0.6","v2.0.5","v2.0.4","v2.0.3","v2.0.2","v2.0.1","v1.65.7","v1.65.6","v1.65.5","v1.65.4","v1.65.3","v1.65.2","v1.65.1","v1.65.0","v1.64.1","v1.64.0","v1.63.0","v1.62.3","v1.62.2","v1.62.1","v1.62.0","v1.61.2","v1.61.0","v1.60.1","v1.60.0","v1.59.0","v1.58.0","v1.57.0","v1.56.0","v1.55.5","v1.54.0","v1.55.4","v1.55.3","v1.55.2","v1.55.1","v1.55.0","v1.54.1","v1.53.0","v1.52.2","v1.52.1","v1.52.0","v1.51.0","v1.50.0","v1.49.1","v1.49.0","v1.48.4","v1.48.3","v1.48.2","v1.48.1","v1.47.0","v1.45.1","v1.44.2","v1.44.1","v1.43.5","v1.43.4","v1.43.3","v1.43.2","v1.43.1","v1.43.0","v1.41.1","v1.41.0","v1.40.1","v1.40.0","v1.39.3","v1.39.2","v1.38.2","v1.38.1","v1.37.4","v1.37.3","v1.37.2","v1.37.1","v1.36.1","v1.35.1","v1.34.1","v1.33.2","v1.33.1","v1.32.1","v1.31.1","v1.30.1","v1.29.1","v1.28.1","v1.27.2","v1.26.1","v1.24.1","v1.23.2","v1.23.1","v1.22.1","v1.10.1","v1.10.0","v1.8.1","v1.7.12","v1.6.12","v1.6.9","v1.6.4","v1.6.2","v1.6.1","1.6.0","v1.5.0","v1.4.0","v1.3.0","v1.2.0","v1.1.0","v1.0.0","v0.0.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34590.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N"}]}