---
cve: "CVE-2026-73038"
severity: "MEDIUM"
cvss: 5.3
epss: "0.2%"
vendor: "NodeBB"
kev: false
exploited: false
published: "2026-08-13 19:17:34"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-27T12:41:18+02:00"
---

# CVE-2026-73038

> 5.3 MEDIUM · 🧪 PoC

## Beschreibung

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.

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **poc**
  - Automatable: **no**
  - Technical Impact: **partial**

## CVSS-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |

## Patch verfügbar (OSV)

- fbdbb00d01e01a92baf64534a05fd13685cf3d88 (Commit)
- c0d94a217edcafcdb9b3920a6e80935194bcb19e (Commit)

## Referenzen

- <https://github.com/NodeBB/NodeBB/issues/14601>
- <https://github.com/NodeBB/NodeBB/releases/tag/v4.15.0>
- <https://github.com/NodeBB/NodeBB/commit/c0d94a217edcafcdb9b3920a6e80935194bcb19e>
- <https://www.vulncheck.com/advisories/nodebb-stored-xss-via-activitypub-emoji-tag-icon-url-and-tag-name>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-73038) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_