CVE-2026-73038
MediumCVSS 6.1Exploitation Probability (EPSS)
Low risk14th percentile - higher than 14% of all known CVEs
Summary
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.
Risk Assessment
An attacker could steal session data, take over user accounts, or spread malicious content within the community, potentially compromising trust and security.
Recommendation
Update NodeBB to version 4.15.0 or later and consider strengthening Content Security Policy (CSP).
Other vulnerabilities in NodeBB
See all- CVE-2025-29513Medium
Cross-Site Scripting (XSS) vulnerability in NodeBB v4.0.4 and before allows remote attackers to store arbitrary code in the admin API Access token generator.
- CVE-2024-57041Medium
A persistent cross-site scripting (XSS) vulnerability was found in NodeBB v3.11.0. An attacker can store arbitrary JavaScript code in the 'About Me' section of their profile.
- CVE-2026-58593High
A vulnerability in NodeBB allows a remote attacker to impersonate any local user, including the administrator, by forging posts and private messages via the ActivityPub protocol. The issue stems from missing validation that the authenticated remote actor is the actual author of the ActivityPub object.
- CVE-2025-29512Medium
A Cross-Site Scripting (XSS) vulnerability in NodeBB v4.0.4 and earlier allows remote attackers to store arbitrary JavaScript code, potentially rendering the IP blacklist functionality unusable until the malicious content is removed from the database.
Original NVD description (English source)
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 data from NVD (NIST) · CISA KEV · EPSS