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CVE-2026-55890— Grav: Stored CSS injection via Markdown image ?style=… reaches MediaObjectTrait::style()

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.

getgrav Grav是getgrav个人开发者开源的一套可扩展的内容管理系统。 getgrav Grav 2.0.0-rc.9之前版本存在跨站脚本漏洞，该漏洞源于对Markdown MediaObjectTrait::style方法缺少清理，允许编辑器保存未清理的Markdown图像样式参数，导致存储型跨站脚本攻击。

CVSS 4.8 · Medium EPSS 0.31% · P21

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
getgrav grav < 2.0.0-rc.9 affected
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I. Basic Information for CVE-2026-55890

Vulnerability Information
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Vulnerability Title
Grav: Stored CSS injection via Markdown image ?style=… reaches MediaObjectTrait::style()
Source: CVE Program / CVE List V5
Vulnerability Description
Grav is a file-based Web platform. Prior to 2.0.0-rc.9, Grav's incomplete fix for stored XSS through the Markdown media attribute action (CVE-2026-42841) leaves the sibling MediaObjectTrait::style method reachable through the same Markdown excerpt-action pipeline, allowing an editor to save Markdown image style parameters that are written into the rendered img style attribute without sanitization. This issue is fixed in version 2.0.0-rc.9.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/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
getgrav Grav 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
getgrav Grav是getgrav个人开发者开源的一套可扩展的内容管理系统。 getgrav Grav 2.0.0-rc.9之前版本存在跨站脚本漏洞，该漏洞源于对Markdown MediaObjectTrait::style方法缺少清理，允许编辑器保存未清理的Markdown图像样式参数，导致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 < 2.0.0-rc.9 -

II. Public POCs for CVE-2026-55890

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III. Intelligence Information for CVE-2026-55890

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Patches & Fixes for CVE-2026-55890 (1)

Vendor Advisories for CVE-2026-55890 (1)

Same Patch Batch · getgrav · 2026-07-10 · 10 CVEs total

CVE-2026-55885 6.8 MEDIUM Grav: Admin Backup Zip File Exposes Account Credentials and Configuration Secrets
CVE-2026-61450 6.5 MEDIUM Grav before 2.0.2 Config Exfiltration via offsetGet Filter
CVE-2026-61455 6.5 MEDIUM Grav before 2.0.1 Decompression Bomb via ZipArchiver
CVE-2026-61456 4.6 MEDIUM Grav before 1.0.3 Stored XSS via SVG Upload API
CVE-2026-53653 Grav: Unauthenticated denial of service via unbounded image derivative dimensions
CVE-2026-58493 grav-plugin-database: DSN Parameter Injection via Unsanitized Configuration Values in Conn
CVE-2026-58492 grav-plugin-database: SQL Injection in PDO::tableExists() due to Unsanitized Table Name In
CVE-2026-59193 Grav CMS — Improper Handling of Highly Compressed Data in Installer::unZip()
CVE-2026-59190 Grav Admin Plugin — IDOR Privilege Escalation via saveUser()

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-55890

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