CVE-2026-56708

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.

CVSS 4.0

6.9CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L

CVSS 3.1

5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS

0.3% chance of exploitation in the next 30 days; higher than 20% of CVEs (scores of 2026-10-25)

CWE

CWE-367

Published

2026-08-25

Modified

2026-10-12

Record from

the NVD, synced 2026-10-19

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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