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CVE-2026-53758— Emlog: Stored XSS via Parsedown Markdown Processing - Raw HTML Not Sanitized

Quick assessment

Affected
emlog emlog
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.

emlog是emlog团队开源的一款轻量级博客内容管理系统。 emlog 2.6.29及之前版本存在跨站脚本漏洞，该漏洞源于Parsedown处理文章内容时未启用安全模式，导致嵌入Markdown中的原始HTML包括script标签未转义通过且输出未经额外清理，可能导致存储型跨站脚本攻击。

CVSS 8.7 · High EPSS 0.44% · P37

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
emlog emlog <= 2.6.29 affected
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I. Basic Information for CVE-2026-53758

Vulnerability Information
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Vulnerability Title
Emlog: Stored XSS via Parsedown Markdown Processing - Raw HTML Not Sanitized
Source: CVE Program / CVE List V5
Vulnerability Description
Emlog is an open source website building system. In versions 2.6.29 and prior, article content is processed by Parsedown without enabling safe mode, which means raw HTML including <script> tags embedded in Markdown is passed through unescaped. The output is rendered with no additional sanitization, resulting in stored XSS visible to all site visitors. At time of publication, there are no publicly known patches.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA: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
emlog 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
emlog是emlog团队开源的一款轻量级博客内容管理系统。 emlog 2.6.29及之前版本存在跨站脚本漏洞，该漏洞源于Parsedown处理文章内容时未启用安全模式，导致嵌入Markdown中的原始HTML包括script标签未转义通过且输出未经额外清理，可能导致存储型跨站脚本攻击。
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
emlog emlog <= 2.6.29 -

II. Public POCs for CVE-2026-53758

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III. Intelligence Information for CVE-2026-53758

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Vendor Advisories for CVE-2026-53758 (1)

Same Patch Batch · emlog · 2026-09-04 · 4 CVEs total

CVE-2026-53757 6.9 MEDIUM Emlog: Zip Slip Path Traversal in Plugin/Template ZIP Upload Enables RCE
CVE-2026-73848 6.9 MEDIUM Emlog: Stored XSS via Tag Name in Article Editor
CVE-2026-53756 4.9 MEDIUM Emlog Blind SQL Injection via Authentication Cookie

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-53758

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