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.
Published: 2026-11-05
Score: 5.3 Medium
EPSS: n/a
KEV: No
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Remediation

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Advisories

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History

Thu, 05 Nov 2026 18:30:00 +0000

Type Values Removed Values Added
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.
Title Posta before v0.18.0 SSRF via Webhook URL
Weaknesses CWE-918
References
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N'}

cvssV4_0

{'score': 5.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N'}


Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-11-05T18:16:39.804Z

Reserved: 2026-11-05T17:58:51.242Z

Link: CVE-2026-123204

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-11-05T19:17:19.693

Modified: 2026-11-05T19:17:19.693

Link: CVE-2026-123204

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-11-05T20:00:09Z

Weaknesses