CVE-2026-42608— Grav: Unauthenticated Path Traversal & Arbitrary File Write in FormFlash component.
Possible ATT&CK Techniques 3AI
T1059 · Command and Scripting Interpreter T1496 · Resource Hijacking T1190 · Exploit Public-Facing ApplicationGet alerts for future matching vulnerabilitiesLog in to subscribe
I. Basic Information for CVE-2026-42608
Vulnerability Information
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Vulnerability Title
Grav: Unauthenticated Path Traversal & Arbitrary File Write in FormFlash component.
Source: NVD (National Vulnerability Database)
Vulnerability Description
Grav is a file-based Web platform. Prior to 2.0.0-beta.2, there is a Path Traversal vulnerability within the FormFlash core component. By manipulating the session_id (passed as __form-flash-id in POST requests), an unauthenticated attacker can traverse the filesystem to create arbitrary directories and write an index.yaml file containing attacker-controlled data. This vulnerability can lead to unauthorized modification of application behavior, potential data integrity issues, and service disruption in production environments. This vulnerability is fixed in 2.0.0-beta.2.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Grav 路径遍历漏洞
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 2.0.0-beta.2之前版本存在路径遍历漏洞，该漏洞源于FormFlash核心组件中的路径遍历，可能导致未经身份验证的攻击者通过操纵session_id遍历文件系统创建任意目录并写入包含攻击者控制数据的index.yaml文件。
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-2026-42608
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- https://github.com/getgrav/grav/security/advisories/GHSA-hmcx-ch82-3fv2x_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2026-42608
Same Patch Batch · getgrav · 2026-05-11 · 13 CVEs total
| CVE-2026-42613 | 9.4 CRITICAL | Grav: Privilege Escalation via Missing Server-Side Validation of groups/access |
| CVE-2026-42607 | 9.1 CRITICAL | Grav: Remote Code Execution (RCE) via Malicious Plugin ZIP Upload in Direct Install Featur |
| CVE-2026-42611 | 8.9 HIGH | Grav: Stored XSS via Tag Injection |
| CVE-2026-42843 | 8.8 HIGH | grav-plugin-api: Grav API Privilege Escalation to Super Admin |
| CVE-2026-42612 | 8.5 HIGH | Grav: Publisher-Level Stored XSS via Unquoted Event Attributes |
| CVE-2026-42609 | 8.1 HIGH | Grav: Administrative Account Disruption and Privilege De-escalation via User Overwrite Log |
| CVE-2026-44738 | 7.7 HIGH | Grav: Twig sandbox allows editor-role users to exfiltrate all plugin secrets via Config::t |
| CVE-2026-42610 | 6.5 MEDIUM | Grav: Sensitive Information Disclosure via Accounts Service Bypass |
| CVE-2026-42842 | 5.4 MEDIUM | grav-plugin-form: XSS via Taxonomy Field Values in Admin Panel |
| CVE-2026-42845 | Grav: Anonymous Page Content Overwrite via Form File Upload filename Override | |
| CVE-2026-42841 | Grav: Stored XSS via Markdown media attribute() action in Grav CMS | |
| CVE-2026-44737 | grav-plugin-admin: Stored Cross-Site Scripting (XSS) Reflected endpoint /admin/pages/[page |
IV. Related Vulnerabilities
Same product: grav
- CVE-2026-42844
Grav: Low-privileged API users can create super-admin accoun - CVE-2026-44738
Grav: Twig sandbox allows editor-role users to exfiltrate al - CVE-2026-42842
grav-plugin-form: XSS via Taxonomy Field Values in Admin Pan - CVE-2026-42613
Grav: Privilege Escalation via Missing Server-Side Validatio - CVE-2026-42612
Grav: Publisher-Level Stored XSS via Unquoted Event Attribut
Same vendor: getgrav
- CVE-2026-42844
Grav: Low-privileged API users can create super-admin accoun - CVE-2026-42843
grav-plugin-api: Grav API Privilege Escalation to Super Admi - CVE-2026-44737
grav-plugin-admin: Stored Cross-Site Scripting (XSS) Reflect - CVE-2026-44738
Grav: Twig sandbox allows editor-role users to exfiltrate al - CVE-2026-42845
Grav: Anonymous Page Content Overwrite via Form File Upload
Same weakness: CWE-22
- CVE-2026-8757
adenhq hive Delete Request routes_sessions.py _read_events_t - CVE-2026-8756
fishaudio Bert-VITS2 Gradio webui_preprocess.py generate_con - CVE-2026-8755
fishaudio Bert-VITS2 Model hiyoriUI.py _get_all_models path - CVE-2026-8754
AstrBotDevs AstrBot File Upload chat.py post_file path trave - CVE-2018-25325
Woocommerce CSV Importer 3.3.6 Path Traversal File Deletion
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