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CVE-2026-61456— Grav before 1.0.3 Stored XSS via SVG Upload API

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 1.0.3之前版本存在跨站脚本漏洞，该漏洞源于未能对通过POST /api/v1/media端点上传的SVG文件进行清理，可能导致经过身份验证的攻击者上传包含任意JavaScript的SVG文件，当管理员在浏览器中打开该文件时，嵌入的脚本会在其会话环境中执行，导致Cookie窃取和会话劫持。

CVSS 4.6 · Medium EPSS 0.24% · P13

Affected Version Matrix 2

VendorProduct Version RangeStatus
getgrav grav < 1.0.3 affected
1.0.3 unaffected
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I. Basic Information for CVE-2026-61456

Vulnerability Information
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Vulnerability Title
Grav before 1.0.3 Stored XSS via SVG Upload API
Source: CVE Program / CVE List V5
Vulnerability Description
The Grav API plugin (getgrav/grav-plugin-api) before 1.0.3 fails to sanitize SVG files uploaded through the POST /api/v1/media endpoint. The HandlesMediaUploads::processUploadedFile() method validates only the file extension and never invokes Security::sanitizeSVG(), so an authenticated attacker with the api.media.write permission can upload an SVG containing arbitrary JavaScript. The file is stored unmodified and served with Content-Type: image/svg+xml; when an administrator opens it in a browser (directly or via <object>/<iframe>), the embedded script executes in their session context, enabling cookie theft and session hijacking.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/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 1.0.3之前版本存在跨站脚本漏洞，该漏洞源于未能对通过POST /api/v1/media端点上传的SVG文件进行清理，可能导致经过身份验证的攻击者上传包含任意JavaScript的SVG文件，当管理员在浏览器中打开该文件时，嵌入的脚本会在其会话环境中执行，导致Cookie窃取和会话劫持。
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 0 ~ 1.0.3 -

II. Public POCs for CVE-2026-61456

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III. Intelligence Information for CVE-2026-61456

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Vendor Advisories for CVE-2026-61456 (2)

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-2026-55890 4.8 MEDIUM Grav: Stored CSS injection via Markdown image ?style=… reaches MediaObjectTrait::style()
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-2026-61456

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