---
id: CVE-2026-56708
title: >-
  Grav API plugin before 1.0.16 contains a server-side request forgery
  vulnerability in webhook delivery that allows attackers to bypass hostname
  validation by DNS rebinding
summary: >-
  Grav API plugin before 1.0.16 contains a server-side request forgery
  vulnerability in webhook delivery that allows attackers to bypass hostname
  validation by DNS rebinding. Attackers controlling authoritative DNS for a
  configured webhook…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N'
cwe:
  - CWE-367
published: '2026-08-25'
updated: '2026-10-12'
sourceUpdated: '2026-10-12T15:10:00.207'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-56708'
references:
  - url: 'https://github.com/getgrav/grav/security/advisories/GHSA-hq2v-cgw4-fw2w'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/grav-api-plugin-before-ssrf-via-dns-rebinding
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00282
epssPercentile: 0.19068
ingestedAt: '2026-10-12T15:55:08.146Z'
---

## Overview

Grav API plugin before 1.0.16 contains a server-side request forgery vulnerability in webhook delivery that allows attackers to bypass hostname validation by DNS rebinding. Attackers controlling authoritative DNS for a configured webhook hostname can answer validation lookups with public addresses and delivery lookups with private addresses to reach internal network resources.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.