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

Quick assessment

Affected
getgrav grav-plugin-admin2
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-plugin-admin2是Grav组织开源的一个现代化的、重新设计的Grav CMS管理面板。 grav-plugin-admin2 2.0.19及之前版本存在跨站脚本漏洞，该漏洞源于tHtml()函数将不受信任的用户名参数替换到翻译模板后解析为markdown，且服务端用户名验证未阻止HTML特殊字符，可能导致攻击者注册包含HTML有效载荷的用户名，当管理员查看相关界面时触发存储型跨站脚本攻击。

CVSS 5.4 · Medium EPSS 0.24% · P14

Possible ATT&CK Techniques 1 AI

T1046 · Network Service Discovery

Affected Version Matrix 2

VendorProduct Version RangeStatus
getgrav grav-plugin-admin2 ≤ 2.0.19 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
Vulnerability Title
grav-plugin-admin2 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
grav-plugin-admin2是Grav组织开源的一个现代化的、重新设计的Grav CMS管理面板。 grav-plugin-admin2 2.0.19及之前版本存在跨站脚本漏洞，该漏洞源于tHtml()函数将不受信任的用户名参数替换到翻译模板后解析为markdown，且服务端用户名验证未阻止HTML特殊字符，可能导致攻击者注册包含HTML有效载荷的用户名，当管理员查看相关界面时触发存储型跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
getgrav grav-plugin-admin2 0 ~ 2.0.19 -

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 2.0.18 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 vendor: getgrav
Same weakness: CWE-79

V. Comments for CVE-2026-85600

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