CVE-2026-126569 · Package
NO FIX YET · SEE WHAT TO DO
Mbin, a Markdown-based federated forum, renders nested Markdown image alt text and URLs without HTML escaping. An authenticated user can embed HTML in an image alt text inside a link in entries, comments, posts, messages or bios, so the script runs in other users' browsers.
first public Nov 10, 2026 · 1 source
Could this affect your app?
Free first check from your website. Connect your repo for the full answer.
Sites running Mbin from 1.2.1 before 1.11.1 where logged-in users can post entries, comments, posts, messages or bios. The flaw needs an account, so sites with closed registration and no untrusted users carry less exposure. Sites already on 1.11.1 or later are not affected.
Not affected if no-user-generated-content, version-1.11.1-or-later
Who cares federated-forum, mbin, self-hosted
1.11.1 are listed as affected.1.11.1 or later.Mbin 1.2.1 before 1.11.1 contains a stored cross-site scripting vulnerability in EmbedElement::buildDestructed() that renders nested Markdown image alt text and URL without HTML escaping. Authenticated users can embed HTML in the alt text of an image inside a link in entries, comments, posts, messages, or bios to run script in viewers' browsers.
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This page as .md · .json · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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