CVE-2026-123204

    Dashboard / Vulnerabilities / CVE-2026-123204

    CVE-2026-123204

    Published: 5 Nov 2026Last Modified: 7 Nov 2026

    Summary: Posta before v0.18.0 SSRF via Webhook URL

    Details: 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.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/123xxx/CVE-2026-123204.json, https://github.com/goposta/posta/releases/tag/v0.18.0, https://nvd.nist.gov/vuln/detail/CVE-2026-123204, https://www.vulncheck.com/advisories/posta-before-0.18.0-ssrf-via-webhook-url, https://github.com/goposta/posta/issues/282, https://github.com/goposta/posta/commit/6bb376b55dcfdcb979040ed42c4bf57b99e4f46a, https://github.com/goposta/posta/pull/315, https://github.com/goposta/posta, https://github.com/goposta/posta/blob/8c3cb6f89c8a992329fac21491c38aed70d05c73/internal/services/webhook/dispatcher.go#L321-L338

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -a10e925b5c5b3be1eafe83bab666240f26173cc6

    Affected versions

    v0.18.0-rc.3
    v0.18.0-rc.2
    v0.18.0-rc.1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-123204 | CVE-DB