CVE-2026-56708: Grav API Plugin before 1.0.16 SSRF via DNS Rebinding

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-25 · updated 2026-10-12
Weakness: CWE-367

Description

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.

Affected products

getgrav grav: before 1.0.16 — fixed in 1.0.16

How to fix

Upgrade to a fixed version: getgrav grav 1.0.16. Check the vendor advisory for mitigations.

References

https://github.com/getgrav/grav/security/advisories/GHSA-hq2v-cgw4-fw2w
https://www.vulncheck.com/advisories/grav-api-plugin-before-ssrf-via-dns-rebinding

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