Medium 6.1Published Aug 13, 2026

CVE-2026-73038NodeBB < 4.15.0 Stored XSS via ActivityPub emoji tag.icon.url and tag.name

Updated under an hour ago (2026-10-19 06:10 UTC)

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It affects NodeBB. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for NodeBB

Exploited in the last 30 days

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.

CVSS: 6.1 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Aug 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

NodeBB NodeBB nodebb:nodebb (from the name)	before 4.15.0	CNA record

References

https://github.com/NodeBB/NodeBB/issues/14601technical-description, issue-tracking
https://github.com/NodeBB/NodeBB/releases/tag/v4.15.0release-notes
https://github.com/NodeBB/NodeBB/commit/c0d94a217edcafcdb9b3920a6e80935194bcb19epatch
https://www.vulncheck.com/advisories/nodebb-stored-xss-via-activitypub-emoji-tag-icon-url-and-tag-namethird-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.