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CVE-2026-57852— Authentication Bypass via Null Short-Circuit in Grav CMS Scheduler Webhook Token Check

Quick assessment

Affected
Trilby Media Grav CMS scheduler-webhook plugin
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Grav Grav是Grav组织开源的一个基于文件系统的无数据库内容管理系统。 Grav 1.1.3及之前版本和2.0.8及之前版本存在授权问题漏洞，该漏洞源于webhook令牌验证中的短路逻辑缺陷，可能导致未经身份验证的远程攻击者通过发送单个未经身份验证的POST请求到调度器webhook端点来触发所有已配置的计划任务或特定任务，导致在web服务器进程用户下意外执行操作员定义的命令。

CVSS 5.6 · Medium EPSS 0.69% · P53

Affected Version Matrix 2

VendorProduct Version RangeStatus
Trilby Media Grav CMS scheduler-webhook plugin ≤ 1.1.3 affected
≤ 2.0.8 affected
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I. Basic Information for CVE-2026-57852

Vulnerability Information
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Vulnerability Title
Authentication Bypass via Null Short-Circuit in Grav CMS Scheduler Webhook Token Check
Source: CVE Program / CVE List V5
Vulnerability Description
Grav CMS scheduler-webhook plugin contains an authentication bypass vulnerability that allows unauthenticated remote attackers to trigger configured scheduled jobs by exploiting a short-circuit logic flaw in the webhook token validation. Attackers can send a single unauthenticated POST request to the scheduler webhook endpoint to execute all configured scheduled jobs or target a specific job, causing unintended execution of operator-defined commands under the web server process user.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
认证算法的不正确实现
Source: CVE Program / CVE List V5
Vulnerability Title
Grav 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Grav Grav是Grav组织开源的一个基于文件系统的无数据库内容管理系统。 Grav 1.1.3及之前版本和2.0.8及之前版本存在授权问题漏洞，该漏洞源于webhook令牌验证中的短路逻辑缺陷，可能导致未经身份验证的远程攻击者通过发送单个未经身份验证的POST请求到调度器webhook端点来触发所有已配置的计划任务或特定任务，导致在web服务器进程用户下意外执行操作员定义的命令。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Trilby Media Grav CMS scheduler-webhook plugin 0 ~ 1.1.3 -

II. Public POCs for CVE-2026-57852

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III. Intelligence Information for CVE-2026-57852

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Vendor Advisories for CVE-2026-57852 (2)

IV. Related Vulnerabilities

Same vendor: Trilby Media
Same weakness: CWE-303