EUVD-2026-58646
GHSA-cgvr-f65r-pjv3
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
Page-editor account required (PR:L); victim must view the page (UI:R); stored XSS crosses security boundary to victim browser scope (S:C); no server confidentiality or availability impact.
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 versions from 1.5.2 through 2.0.12 contain a stored cross-site scripting vulnerability in the Security::detectXss() function (system/src/Grav/Common/Security.php). The event-handler scan is anchored at < and uses [^>]*?, which cannot cross the first literal >; when a > appears inside a quoted attribute value the browser keeps the tag open and parses a subsequent event handler (e.g. onerror), so the detector and browser disagree. A page editor without admin.super privileges can save page content such as <img src=x title=">" onerror=alert(document.domain)>, which is accepted, stored, and executed in the site origin when any visitor (including unauthenticated users) views the page. Fixed in 2.0.13.
AnalysisAI
Stored cross-site scripting in Grav CMS versions 1.5.2 through 2.0.12 allows authenticated page editors lacking admin.super privileges to bypass the built-in XSS filter by embedding a literal > character inside a quoted HTML attribute value, exploiting a regex blind spot in Security::detectXss() that causes the detector to consider the tag closed while browsers continue parsing it and execute a trailing event handler such as onerror. The crafted payload is accepted, persisted server-side, and executes in the site origin every time any visitor - including unauthenticated users - views the affected page. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an account with Grav page-editor privileges; the account must NOT hold `admin.super` (full administrator) rights, making this accessible to broadly-delegated editor roles. … 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, score 5.1) accurately captures the principal limiting factors: the attacker must hold a page-editor credential (PR:L) and a victim must view the page (UI:P). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who holds a Grav page-editor account (without admin.super) edits a publicly accessible page and saves content containing `<img src=x title=">" onerror=alert(document.domain)>`. The flawed regex in `Security::detectXss()` encounters the `>` inside the title attribute and incorrectly treats the tag as closed, passing the payload as safe and storing it in the CMS. … |
| Remediation | Upgrade Grav CMS to version 2.0.13, which resolves the regex defect in `Security::detectXss()`. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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