CVE-2026-73038

Medium

Description

NodeBB before 4.15.0 contains a stored cross-site scripting vulnerability in the renderEmoji function that fails to escape tag.icon.url and tag.name attributes. Attackers can deliver malicious ActivityPub Create/Note objects with crafted emoji tags to inject arbitrary HTML and JavaScript into stored post content, executing code in all viewers' browsers.

SeverityMedium

CVSS6.1

Exploit probability—

Product

NodeBB

PublishedAug 13, 2026

First seenAug 13, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Update

NodeBB NodeBB4.15.0 or later

Patches

github.com/NodeBB/NodeBB/commit/c0d94a217edcafcdb9b3920a6e80935194bcb19e

Vendor advisories

github.com/NodeBB/NodeBB/releases/tag/v4.15.0

Affected products

Product	Affected versions	Fixed in
NodeBB NodeBB	v < 4.15.0	4.15.0

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