CVE-2025-66303— Grav is vulnerable to a DOS on the admin panel
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I. Basic Information for CVE-2025-66303
Vulnerability Information
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Vulnerability Title
Grav is vulnerable to a DOS on the admin panel
Source: NVD (National Vulnerability Database)
Vulnerability Description
Grav is a file-based Web platform. Prior to 1.8.0-beta.27, A Denial of Service (DoS) vulnerability has been identified in Grav related to the handling of scheduled_at parameters. Specifically, the application fails to properly sanitize input for cron expressions. By manipulating the scheduled_at parameter with a malicious input, such as a single quote, the application admin panel becomes non-functional, causing significant disruptions to administrative operations. The only way to recover from this issue is to manually access the host server and modify the backup.yaml file to correct the corrupted cron expression. This vulnerability is fixed in 1.8.0-beta.27.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Grav 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Grav是Grav开源的一套可扩展的用于个人博客、小型内容发布平台和单页产品展示的CMS（内容管理系统）。 Grav 1.8.0-beta.27之前版本存在资源管理错误漏洞，该漏洞源于输入清理不足，可能导致拒绝服务。
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
II. Public POCs for CVE-2025-66303
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- DOS on the admin panel · Advisory · getgrav/grav · GitHubx_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2025-66303
Same Patch Batch · getgrav · 2025-12-01 · 19 CVEs total
| CVE-2025-66299 | 8.8 HIGH | Security Sandbox Bypass with SSTI (Server Side Template Injection) in the Grav CMS |
| CVE-2025-66295 | 8.8 HIGH | Grav vulnerable to Path traversal / arbitrary YAML write via user creation leading to Acco |
| CVE-2025-66296 | 8.8 HIGH | Grav vulnerable to Privilege Escalation in Grav Admin: Missing Username Uniqueness Check A |
| CVE-2025-66300 | 8.5 HIGH | Grav is vulnerable to Arbitrary File Read |
| CVE-2025-66302 | 6.8 MEDIUM | Grav vulnerable to Path Traversal allowing server files backup |
| CVE-2025-66307 | 6.5 MEDIUM | Grav Admin Plugin vulnerable to User Enumeration & Email Disclosure |
| CVE-2025-66304 | 6.2 MEDIUM | Grav Exposes Password Hashes Leading to privilege escalation |
| CVE-2025-66306 | 4.3 MEDIUM | Grav vulnerable to Information Disclosure via IDOR in Grav Admin Panel |
| CVE-2025-66305 | Grav vulnerable to Denial of Service via Improper Input Handling in 'Supported' Parameter | |
| CVE-2025-66294 | Grav is vulnerable to RCE via SSTI through Twig Sandbox Bypass | |
| CVE-2025-66297 | Grav vulnerable to Privilege Escalation and Authenticated Remote Code Execution via Twig I | |
| CVE-2025-66311 | Grav vulnerable to Cross-Site Scripting (XSS) Stored endpoint `/admin/pages/[page]` in Mul | |
| CVE-2025-66309 | Grav vulnerable to Cross-Site Scripting (XSS) Reflected endpoint /admin/pages/[page], para | |
| CVE-2025-66301 | Grav ihas Broken Access Control which allows an Editor to modify the page's YAML Frontmatt | |
| CVE-2025-66308 | Grav Admin Plugin vulnerable to Cross-Site Scripting (XSS) Stored endpoint `/admin/config/ | |
| CVE-2025-66298 | Grav is vulnerable to Server-Side Template Injection (SSTI) via Forms | |
| CVE-2025-66312 | Grav Admin Plugin vulnerable to Cross-Site Scripting (XSS) Stored endpoint `/admin/account | |
| CVE-2025-66310 | Grav vulnerable to Cross-Site Scripting (XSS) Stored endpoint `/admin/pages/[page]` parame |
IV. Related Vulnerabilities
Same product: grav
- CVE-2025-66312
Grav Admin Plugin vulnerable to Cross-Site Scripting (XSS) S - CVE-2025-66311
Grav vulnerable to Cross-Site Scripting (XSS) Stored endpoin - CVE-2025-66310
Grav vulnerable to Cross-Site Scripting (XSS) Stored endpoin - CVE-2025-66309
Grav vulnerable to Cross-Site Scripting (XSS) Reflected endp - CVE-2025-66308
Grav Admin Plugin vulnerable to Cross-Site Scripting (XSS) S
Same vendor: getgrav
- CVE-2020-36955
Grav CMS 1.6.30 Admin Plugin 1.9.18 - 'Page Title' Persisten - CVE-2021-47812
GravCMS 1.10.7 - Arbitrary YAML Write/Update (Unauthenticate - CVE-2025-66312
Grav Admin Plugin vulnerable to Cross-Site Scripting (XSS) S - CVE-2025-66311
Grav vulnerable to Cross-Site Scripting (XSS) Stored endpoin - CVE-2025-66310
Grav vulnerable to Cross-Site Scripting (XSS) Stored endpoin
Same weakness: CWE-400
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Open5GS UPF gtp-path.c _gtpv1_u_recv_cb resource consumption - CVE-2026-42343
FastGPT: Uncontrolled Resource Consumption leading to Sandbo - CVE-2026-42212
SolidCAM-GPPL-IDE: XML External Entity (XXE) and billion-lau - CVE-2026-32686
Unbounded exponent in decimal enables unauthenticated DoS - CVE-2026-20188
Cisco Crosswork Network Controller and Cisco Network Service
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