EUVD-2026-62548Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/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
Network delivery, low complexity; admin.pages permission required (PR:L); stored XSS changes scope to victim browsers (S:C) enabling full session hijack (C:H/I:H).
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
4DescriptionCVE.org
Grav Shortcode Core Plugin allows for the development shortcode plugins that utilize the common format utilized by WordPress and BBCode. Prior to 6.2.2, Grav Shortcode Core passes shortcode syntax through Security::detectXss() because it contains no literal less-than character, then ColorShortcode.php and related attribute handlers concatenate an attacker-controlled parameter into HTML without encoding. An account with admin.pages permission can close the generated attribute and add an event handler, creating stored cross-site scripting that executes for visitors or administrators who view the page. This issue is fixed in version 6.2.2.
AnalysisAI
Stored XSS in Grav Shortcode Core Plugin (prior to 6.2.2) allows an authenticated user with admin.pages permission to inject arbitrary JavaScript into page content by supplying a crafted shortcode attribute value that breaks out of an HTML attribute context. The plugin's shortcode syntax bypasses Grav's save-time XSS filter because shortcode notation never contains a literal less-than character, and multiple attribute handlers (ColorShortcode, DivShortcode, ColumnsShortcode, and others) then concatenate the raw parameter directly into rendered HTML. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an account with the admin.pages permission in Grav - this is not a default anonymous or subscriber-level role and must be explicitly granted by a Grav administrator. … 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/VC:H/VI:H/VA:N) scores 8.5, reflecting low-complexity network exploitation requiring low privileges and passive victim interaction. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade grav-plugin-shortcode-core to version 6.2.2 or later using the Grav package manager or by downloading the release directly from https://github.com/getgrav/grav-plugin-shortcode-core/releases/tag/6.2.2. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Grav instances running Shortcode Core Plugin and inventory their versions to determine exposure scope. …
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External POC / Exploit Code
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