CVE-2026-56708: Time-of-check Time-of-use (TOCTOU) Race Condition in getgrav grav
CVE-2026-56708 is a medium severity vulnerability in the Grav API plugin before version 1.0.16. It involves a server-side request forgery (SSRF) issue in webhook delivery, where attackers can bypass hostname validation using DNS rebinding. This allows attackers controlling the DNS for a webhook hostname to manipulate validation and delivery lookups to access internal network resources.
AI Analysis
Technical Summary
The Grav API plugin prior to version 1.0.16 contains a TOCTOU race condition leading to a server-side request forgery vulnerability in webhook delivery. Attackers who control the authoritative DNS for a configured webhook hostname can exploit DNS rebinding to bypass hostname validation. They respond to validation DNS lookups with public IP addresses and to delivery DNS lookups with private IP addresses, enabling them to reach internal network resources that should be protected.
Potential Impact
An attacker can bypass hostname validation in webhook delivery, potentially allowing unauthorized access to internal network resources via SSRF. This could lead to information disclosure or further internal network attacks. The vulnerability does not require privileges or user interaction and has a medium severity rating with a CVSS 4.0 score of 6.9.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch information is provided in the available data. Until a fix is available, organizations should consider restricting DNS control for webhook hostnames and monitoring webhook configurations for suspicious activity.
CVE-2026-56708: Time-of-check Time-of-use (TOCTOU) Race Condition in getgrav grav
Description
CVE-2026-56708 is a medium severity vulnerability in the Grav API plugin before version 1.0.16. It involves a server-side request forgery (SSRF) issue in webhook delivery, where attackers can bypass hostname validation using DNS rebinding. This allows attackers controlling the DNS for a webhook hostname to manipulate validation and delivery lookups to access internal network resources.
CVSS v4.0
Score 6.9medium
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Grav API plugin prior to version 1.0.16 contains a TOCTOU race condition leading to a server-side request forgery vulnerability in webhook delivery. Attackers who control the authoritative DNS for a configured webhook hostname can exploit DNS rebinding to bypass hostname validation. They respond to validation DNS lookups with public IP addresses and to delivery DNS lookups with private IP addresses, enabling them to reach internal network resources that should be protected.
Potential Impact
An attacker can bypass hostname validation in webhook delivery, potentially allowing unauthorized access to internal network resources via SSRF. This could lead to information disclosure or further internal network attacks. The vulnerability does not require privileges or user interaction and has a medium severity rating with a CVSS 4.0 score of 6.9.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch information is provided in the available data. Until a fix is available, organizations should consider restricting DNS control for webhook hostnames and monitoring webhook configurations for suspicious activity.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-06-22T18:48:27.060Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a8cf57aacd9273b49842871
Added to database: 08/25/2026, 01:52:58 UTC
Last enriched: 08/25/2026, 02:09:21 UTC
Last updated: 08/25/2026, 03:04:56 UTC
Views: 5
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