CVE-2026-85600

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    CVE-2026-85600

    Published: 4 Sept 2026Last Modified: 10 Sept 2026

    Summary: Grav Admin before 2.0.21 Stored XSS via username

    Details: 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.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85600.json, https://github.com/getgrav/grav/security/advisories/GHSA-96xm-c5hr-59rx, https://nvd.nist.gov/vuln/detail/CVE-2026-85600, https://www.vulncheck.com/advisories/grav-admin-before-2.0.21-stored-xss-via-username

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    2.0.19
    2.0.18
    2.0.17
    2.0.16
    2.0.15
    2.0.14
    2.0.13
    2.0.12
    2.0.11
    2.0.10
    2.0.9
    2.0.8
    2.0.7
    2.0.6
    2.0.5
    2.0.4
    2.0.3
    2.0.2
    2.0.1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-85600 | CVE-DB