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CVE-2026-85600— Grav Admin before 2.0.21 Stored XSS via username

Quick assessment

Affected
getgrav grav
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Grav Admin（getgrav/grav-plugin-admin2）版本 2.0.19 及更早版本中存在一个存储型跨站脚本（Stored XSS）漏洞，该漏洞位于 函数中（文件路径： ）。该函数会将不可信参数（如用户名）代入翻译模板，并将结果作为 Markdown 进行解析。Grav 的服务端用户名校验逻辑（ ）虽然阻止了对文件系统有危险性的字符，但并未拦截 、 、 或 等 HTML 相关字符。这使得攻击者可以注册一个包含 HTML 载荷的用户名。当管理员访问任何通过 渲染用户名的用户界面（例如“强制禁用双

CVSS 5.4 · Medium

Possible ATT&CK Techniques 1 AI

T1046 · Network Service Discovery

Affected Version Matrix 2

VendorProduct Version RangeStatus
getgrav grav < 2.0.21 affected
2.0.21 unaffected
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I. Basic Information for CVE-2026-85600

Vulnerability Information
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Vulnerability Title
Grav Admin before 2.0.21 Stored XSS via username
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
getgrav grav 0 ~ 2.0.21 -

II. Public POCs for CVE-2026-85600

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III. Intelligence Information for CVE-2026-85600

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Vendor Advisories for CVE-2026-85600 (2)

Same Patch Batch · getgrav · 2026-09-04 · 7 CVEs total

CVE-2026-85604 8.8 HIGH Grav before 2.0.19 Remote Code Execution via sort filter
CVE-2026-85599 7.2 HIGH Grav Shortcode Core before 6.2.5 Stored XSS via unescaped parameters
CVE-2026-85603 6.5 MEDIUM Grav Admin Plugin Path Traversal via Save As Language Code
CVE-2026-85598 6.4 MEDIUM Grav 2.0.0 through 2.0.17 Stored XSS via Modular Pages
CVE-2026-85601 5.4 MEDIUM Grav Admin before 2.0.20 Cross-Site Scripting via marked.js
CVE-2026-85602 5.3 MEDIUM Grav Form Plugin before 9.1.20 reCAPTCHA v3 Authentication Bypass

IV. Related Vulnerabilities

Same product: grav
Same vendor: getgrav
Same weakness: CWE-79

V. Comments for CVE-2026-85600

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