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  4. CVE 2026 123204 posta before v0180 ssrf via webhook url
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Back to active CVEs
Medium · CVSS 5.3CVE-2026-123204

Posta before v0.18.0 SSRF via Webhook URLCVE-2026-123204

Answer in brief

CVE-2026-123204 records a Medium severity (CVSS 5.3) vulnerability in Posta before v0.18.0 SSRF via Webhook URL. The current sources do not mark it as known exploited. The current feed maps goposta/posta (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 5, 2026Updated Nov 5, 2026Source checked Nov 5, 2026First seen by HOL Nov 5, 2026Material review Nov 5, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 5.3
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps goposta/posta (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
goposta/postageneric>=0 <v0.18.0v0.18.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for goposta/posta.
  2. 2Review the reported fix. Update goposta/posta to v0.18.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 5, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 5, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 5, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referencevulncheck.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • buku through 5.1.1 SSRF via bukuserver fetch_data and network_handle APIAlso CWE-918
  • SuiteCRM: isSelfRequest() bypass via substring match allows SSRF to internal servicesAlso CWE-918
  • SuiteCRM: Non-admin user creates SchedulersJob: SSRF via cronAlso CWE-918
  • SuiteCRM: Authenticated SSRF in CalendarAccount testConnection Allows Internal Network Access and Response DisclosureAlso CWE-918

Record context

Vulnerability class
SSRF
EPSS
Not reported
CWE IDs
CWE-918
Source
CVE List V5
Source checked
Nov 5, 2026
References
6 linked sources
Open source record