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CVE-2021-29484— DOM XSS in Theme Preview

Quick assessment

Affected
TryGhost Ghost
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Ghost CMS是新加坡Ghost基金会的一套使用JavaScript编写的开源无头内容管理系统（CMS）。 Ghost CMS 存在跨站脚本漏洞，攻击者可利用该漏洞可以通过让登录用户点击包含恶意代码的链接来获得访问权限，用户不需要输入凭证。

CVSS 6.8 · Medium EPSS 7.94% · P95

Public Exploits 1

Nuclei · 1 CVE-2021-29484.yaml [template]

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise
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I. Basic Information for CVE-2021-29484

Vulnerability Information
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Vulnerability Title
DOM XSS in Theme Preview
Source: CVE Program / CVE List V5
Vulnerability Description
Ghost is a Node.js CMS. An unused endpoint added during the development of 4.0.0 has left sites vulnerable to untrusted users gaining access to Ghost Admin. Attackers can gain access by getting logged in users to click a link containing malicious code. Users do not need to enter credentials and may not know they've visited a malicious site. Ghost(Pro) has already been patched. We can find no evidence that the issue was exploited on Ghost(Pro) prior to the patch being added. Self-hosters are impacted if running Ghost a version between 4.0.0 and 4.3.2. Immediate action should be taken to secure your site. The issue has been fixed in 4.3.3, all 4.x sites should upgrade as soon as possible. As the endpoint is unused, the patch simply removes it. As a workaround blocking access to /ghost/preview can also mitigate the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/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
Vulnerability Title
Ghost CMS 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Ghost CMS是新加坡Ghost基金会的一套使用JavaScript编写的开源无头内容管理系统（CMS）。 Ghost CMS 存在跨站脚本漏洞，攻击者可利用该漏洞可以通过让登录用户点击包含恶意代码的链接来获得访问权限，用户不需要输入凭证。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
TryGhost Ghost >= 4.0.0, < 4.3.3 -

II. Public POCs for CVE-2021-29484

# POC Description Source Link Shenlong Link
1 Ghost CMS 4.0.0 to 4.3.2 contains a DOM cross-site scripting vulnerability. An unused endpoint added during the development of 4.0.0 allows attackers to gain access by getting logged-in users to click a link containing malicious code. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-29484.yaml POC Details
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III. Intelligence Information for CVE-2021-29484

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Vendor Advisories for CVE-2021-29484 (1)

Security Blog Posts for CVE-2021-29484 (1)

Other References for CVE-2021-29484 (2)

IV. Related Vulnerabilities

Same product: Ghost
Same vendor: TryGhost
Same weakness: CWE-79

V. Comments for CVE-2021-29484

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