CVE-2026-58657

Sažetak

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.

Reference

CVSS

Base:	4.8
Impact:	2.7
Exploitability:	1.7

Pristup

Vektor	Složenost	Autentikacija
NETWORK	LOW	HIGH

Impact

Povjerljivost	Cjelovitost	Dostupnost
LOW	LOW	NONE

CVSS vektor

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Zadnje važnije ažuriranje

08-07-2026 - 15:28

Objavljeno

08-07-2026 - 14:17