Medium severity4.3NVD Advisory· Published Nov 5, 2026
CVE-2026-123204
CVE-2026-123204
Description
Posta before v0.18.0 contains a server-side request forgery vulnerability that allows authenticated users with edit rights to make the backend send POST requests to internal destinations by creating webhooks with arbitrary URLs. Attackers can target loopback, private-network or cloud metadata addresses and read delivery status codes and error strings to probe internal hosts and ports.
Affected products
1Patches
Vulnerability mechanics
References
6- github.com/goposta/posta/blob/8c3cb6f89c8a992329fac21491c38aed70d05c73/internal/services/webhook/dispatcher.gonvd
- github.com/goposta/posta/commit/6bb376b55dcfdcb979040ed42c4bf57b99e4f46anvd
- github.com/goposta/posta/issues/282nvd
- github.com/goposta/posta/pull/315nvd
- github.com/goposta/posta/releases/tag/v0.18.0nvd
- www.vulncheck.com/advisories/posta-before-0.18.0-ssrf-via-webhook-urlnvd
News mentions
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