CVE-2026-73038CWE-79cross-site-scripting

CVE-2026-73038

Medium · published August 13, 2026

CVSS v3.1
6.1
EPSS
0%
Percentile
15.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.1 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00246 · 15.0th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-08-13T23:17Z
References (5)
https://github.com/NodeBB/NodeBB/commit/c0d94a217edcafcdb9b3920a6e80935194bcb19e · [email protected]https://github.com/NodeBB/NodeBB/issues/14601 · [email protected]https://github.com/NodeBB/NodeBB/releases/tag/v4.15.0 · [email protected]https://www.vulncheck.com/advisories/nodebb-stored-xss-via-activitypub-emoji-tag-icon-url-and-tag-name · [email protected]https://github.com/NodeBB/NodeBB/issues/14601 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 13 AUG 18:41Z
    NodeBB < 4.15.0 Stored XSS via ActivityPub emoji tag.icon.url and tag.name
    cvelistv5