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Grav API Plugin CVE-2026-56708

| EUVDEUVD-2026-65206 MEDIUM
Time-of-check Time-of-use (TOCTOU) Race Condition (CWE-367)
2026-08-25 VulnCheck GHSA-h2w4-jr6m-7c52
SSRF Grav Getgrav
6.9
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
6.9 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
5.4 MEDIUM

DNS rebinding requires attacker-controlled authoritative DNS for a preconfigured webhook host and precise TTL timing (AC:H); scope changes as SSRF reaches internal network systems beyond the Grav server.

3.1 AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
4.0 AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Patch available
Aug 25, 2026 - 03:16 EUVD
Analysis Generated
Aug 25, 2026 - 02:37 vuln.today

DescriptionCVE.org

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.

AnalysisAI

Server-side request forgery in the Grav API plugin before version 1.0.16 allows an attacker who controls authoritative DNS for a configured webhook hostname to reach private internal network resources from the Grav server. The flaw exploits a TOCTOU race (CWE-367) between hostname validation and HTTP delivery: validation resolves the hostname to a legitimate public address, but a DNS rebind before delivery redirects the actual request to an RFC1918 address. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires two simultaneous conditions to hold. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 base score of 6.9 (Medium) reflects network-reachable SSRF with no direct impact on the Grav server itself (VC/VI/VA all N) and only limited impact on subsequently reachable internal systems (SC:L/SI:L/SA:L). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade the Grav API plugin to version 1.0.16 or later, as documented in GitHub Security Advisory GHSA-hq2v-cgw4-fw2w (https://github.com/getgrav/grav/security/advisories/GHSA-hq2v-cgw4-fw2w). … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-56708 vulnerability details – vuln.today
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