CVE-2026-73038
NodeBB < 4.15.0 Stored XSS via ActivityPub emoji tag.icon.url and tag.name
- State
- Published
- Severity
- 5.3 Medium
- Published
- Aug 13, 2026
- Updated
- Aug 14, 2026
- Reserved
- Aug 10, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.3 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N | VulnCheck |
| 3.1 | 6.1 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N | VulnCheck |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
NodeBBNodeBB |
|
References
- Researcher Disclosuretechnical-descriptionissue-tracking
- NodeBB 4.15.0 Release Notesrelease-notes
- Patch Commitpatch
- https://www.vulncheck.com/advisories/nodebb-stored-xss-via-activitypub-emoji-tag-icon-url-and-tag-namethird-party-advisory
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