Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-58657— Grav - Stored CSS Injection via Markdown Image resize() Action

CVSS 4.8 · Medium
Get alerts for future matching vulnerabilitiesLog in to subscribe

I. Basic Information for CVE-2026-58657

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Grav - Stored CSS Injection via Markdown Image resize() Action
Source: NVD (National Vulnerability Database)
Vulnerability Description
Grav before 2.0.0 (affected through 2.0.0-rc.9 and the 2.0 branch) contains a stored CSS injection vulnerability in the Markdown image resize() media action. Prior media hardening rejects direct ?style= payloads and unsafe attribute() fallbacks, but the resize() action in Excerpts::processMediaActions() writes caller-controlled values directly into the image's styleAttributes. A lower-privileged content editor who can edit page Markdown can store a crafted image URL with semicolon-delimited CSS declarations in the resize parameters, which are rendered into the final <img style=...> attribute when a higher-privileged reviewer/admin views the page or preview. This does not require JavaScript execution but enables UI redress/overlay and content-manipulation attacks (e.g., a full-viewport fixed overlay). Fixed in 2.0.0.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
GravGrav 2.0.0-rc.9 ~ 2.0.0 -

II. Public POCs for CVE-2026-58657

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-58657

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-58657 (2)

Vendor Advisories for CVE-2026-58657 (1)

News Coverage for CVE-2026-58657 (1)

IV. Related Vulnerabilities

Same product: Grav
Same vendor: Grav
Same weakness: CWE-79

V. Comments for CVE-2026-58657

No comments yet

Leave a comment