EUVD-2026-37916
GHSA-pfvx-ccc8-f3hr
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
Editor-level authentication required (PR:L), victim must load page (UI:R), stored payload persists across sessions with scope change (S:C), no availability impact.
Primary rating from Vendor (Fluid Attacks).
CVSS VectorVendor: Fluid Attacks
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 2.0.0-rc.9 with Admin2 2.0.0-rc.14 contains a stored cross-site scripting (XSS) vulnerability in the Admin2 Pages API save flow.
AnalysisAI
Stored XSS in Grav CMS's grav-plugin-api (Admin2) allows a low-privileged editor to persist malicious JavaScript in page content via the PATCH /pages API endpoint, which then executes in any administrator's or visitor's browser when the affected page is loaded. The root cause is that the API's partial-field validation path (validateChangedFields()) ran only type and required-field checks but omitted the XSS safety gate (Validation::checkSafety()), a check the classic Admin interface correctly enforced - creating a trust-boundary bypass exclusive to the REST API path. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated session with at least editor-level (non-superadmin) privileges on the target Grav installation - unauthenticated access is not sufficient per the PR:L CVSS metric. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:P) scores this at 5.1 (Medium), accurately reflecting two key mitigating factors: exploitation requires a valid low-privileged editor account (PR:L) and a victim must passively load the poisoned page (UI:P). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with a valid editor-level account authenticates to the Grav REST API and issues a PATCH /pages request with a Markdown content body containing a payload such as <img src=x onerror=alert(document.cookie)>; because validateChangedFields() omits the checkSafety() call, the payload is written to the flat-file store without sanitization. When an administrator or site visitor subsequently loads the affected page, the injected handler fires in their browser session, enabling session cookie exfiltration, admin credential theft, or further payload staging. … |
| Remediation | Upstream fix available (PR/commit); released patched version not independently confirmed. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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