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Grav CMS EUVDEUVD-2026-60592

| CVE-2026-75828 CRITICAL
Cross-site Scripting (XSS) (CWE-79)
2026-08-18 VulnCheck GHSA-9pr6-8r9w-wvmj
XSS Grav
9.3
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
9.3 CRITICAL
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/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
vuln.today AI
8.7 HIGH

Network-reachable stored XSS needing a low-privileged editor account (PR:L) and a victim viewing the page (UI:R); execution in the visitor's browser crosses a trust boundary (S:C) with high confidentiality/integrity impact and no availability effect.

3.1 AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
P
Scope
X

Lifecycle Timeline

3
Patch available
Aug 18, 2026 - 12:02 EUVD
Analysis Generated
Aug 18, 2026 - 11:49 vuln.today
CVE Published
Aug 18, 2026 - 11:19 cve.org
CRITICAL 9.3

DescriptionCVE.org

Grav before 2.0.15 contains a stored cross-site scripting vulnerability in the detectXss() function where unpaired quotes in unquoted attribute values bypass event-handler detection. Authenticated editors can inject event handlers like onerror= that pass validation and execute in visitor browsers when page content is rendered.

AnalysisAI

Stored cross-site scripting in Grav CMS before 2.0.15 lets authenticated editors smuggle JavaScript event handlers past the detectXss() sanitizer, which fails to flag event handlers (e.g. onerror=) placed in unquoted HTML attribute values containing unpaired quotes. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
Obtain editor-level Grav account
Delivery
Craft unquoted attribute with unpaired quote hiding onerror=
Exploit
Save page, bypassing detectXss() validation
Install
Payload stored in page content
C2
Victim renders page in browser
Execute
Event handler executes in victim session
Impact
Session hijack or admin takeover
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Vulnerability AssessmentAI

Exploitation Requires an authenticated Grav account with page-editing (editor/author) privileges - this is the core limiting factor (PR:L); anonymous internet users cannot exploit it directly. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The signals are mostly consistent and point to a genuine high priority within the population that runs Grav. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with (or who has phished/compromised) a low-privileged Grav editor account edits a page and inserts an HTML tag whose unquoted attribute value uses an unpaired quote to hide an onerror= handler, which passes detectXss() and is saved. When a normal site visitor or an administrator later views the page, the handler executes in their browser, allowing session-cookie theft, actions performed as the victim, or admin-account takeover. …
Remediation Vendor-released patch: upgrade to Grav 2.0.15 or later, which corrects the detectXss() attribute-parsing logic; this is the primary and recommended fix (see advisory GHSA-vfmf-q6x9-cw96 at https://github.com/getgrav/grav/security/advisories/GHSA-vfmf-q6x9-cw96). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Audit all Grav CMS instances to identify version and assess whether they are running before 2.0.15; restrict editor permissions to only trusted personnel and review recent page modifications for suspicious JavaScript. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-60592 vulnerability details – vuln.today
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