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

Quick assessment

Affected
NodeBB NodeBB
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 NodeBB 4.15.0 之前的版本中，renderEmoji 函数存在一个存储型跨站脚本（Stored XSS）漏洞，该函数未能正确转义 tag.icon.url 和 tag.name 属性。攻击者可以通过构造包含恶意 emoji 标签的 ActivityPub Create/Note 对象，将任意 HTML 和 JavaScript 代码注入到已存储的帖子内容中，从而在查看所有帖子的用户浏览器中执行恶意代码。

CVSS 6.1 · Medium EPSS 0.25% · P15

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
NodeBB NodeBB < 4.15.0 affected
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I. Basic Information for CVE-2026-73038

Vulnerability Information
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Vulnerability Title
NodeBB < 4.15.0 Stored XSS via ActivityPub emoji tag.icon.url and tag.name
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
NodeBB NodeBB 0 ~ 4.15.0 -

II. Public POCs for CVE-2026-73038

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III. Intelligence Information for CVE-2026-73038

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Patches & Fixes for CVE-2026-73038 (2)

Proof of Concept for CVE-2026-73038 (1)

News Coverage for CVE-2026-73038 (1)

IV. Related Vulnerabilities

Same product: NodeBB
Same vendor: NodeBB
Same weakness: CWE-79

V. Comments for CVE-2026-73038

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