EUVD-2026-71023
GHSA-7wfh-5xcc-cx4q
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/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
PR:L for required account registration, UI:R for mandatory admin interaction, S:C for cross-session payload execution, C:L/I:L for limited but real admin session compromise.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
2DescriptionCVE.org
Grav Admin (getgrav/grav-plugin-admin2) versions <= 2.0.19 contain a stored cross-site scripting vulnerability in the tHtml() function (src/lib/stores/i18n.svelte.ts), which substitutes untrusted parameters such as usernames into translation templates before parsing the result as markdown. Grav's server-side username validation (DataUser::isValidUsername) blocks filesystem-dangerous characters but not <, >, ", or ', allowing an attacker to register a username containing an HTML payload. When an administrator views a UI surface that renders the username through tHtml()-such as the two-factor force-disable confirmation prompt or the 'page is locked' editor notice-the payload executes in their authenticated session. Fixed in 2.0.21.
AnalysisAI
Stored cross-site scripting in Grav Admin plugin (getgrav/grav-plugin-admin2) versions <= 2.0.19 allows a low-privileged attacker to inject HTML/JavaScript payloads via a crafted username that bypasses server-side validation, executing in an administrator's browser session when specific UI surfaces render the stored username. The root cause is the tHtml() internationalisation function in src/lib/stores/i18n.svelte.ts, which inserts unescaped user-supplied parameters into locale template strings before markdown parsing - a classic stored XSS pattern. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires two concurrent conditions: (1) the attacker must be able to register a Grav account with a fully attacker-controlled username - this is only possible if public user self-registration is enabled, or an alternative account-creation path exists such as an invitation link or a separate registration vulnerability; (2) a Grav administrator must navigate to a UI surface that renders the stored username through the vulnerable `tHtml()` code path, specifically identified as the two-factor authentication force-disable confirmation prompt or the 'page is locked' editor notice. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 5.1 (PR:L/UI:P/SC:L/SI:L) accurately reflects realistic exploitation constraints: the attacker needs a registered account and must induce or wait for an administrator to visit a specific UI surface. … 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 the Grav Admin plugin to version 2.0.21 or later, which contains the vendor-confirmed fix documented in GHSA-96xm-c5hr-59rx (https://github.com/getgrav/grav/security/advisories/GHSA-96xm-c5hr-59rx). … 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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