What is CVE-2026-73038?

CVE-2026-73038 is a medium-severity vulnerability in Nodebb, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-08-13.

How severe is CVE-2026-73038?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Nodebb

CVE-2026-73038

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.

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Nodebb — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

disclosure@vulncheck.com (technical-description)
disclosure@vulncheck.com (release-notes)
disclosure@vulncheck.com (patch)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-73038?: CVE-2026-73038 is a medium-severity vulnerability in Nodebb, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-08-13.
How severe is CVE-2026-73038?: Medium severity. CVSS v3 base score is 6.1 out of 10.