CVE-2026-53758
Received Received - Intake

Stored XSS in Emlog Due to Unsafe Parsedown Processing

Publication date: 2026-09-04

Last updated on: 2026-09-04

Assigner: GitHub, Inc.

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.

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Meta Information

Published
2026-09-04
Last Modified
2026-09-04
Generated
2026-09-05
AI Q&A
2026-09-04
EPSS Evaluated
N/A
NVD
CVE-2026-53758
EUVD
EUVD-2026-71624

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
emlog emlog to 2.6.29 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

Emlog versions 2.6.29 and prior process article content using Parsedown without safe mode enabled. This allows raw HTML including script tags in Markdown to pass through unescaped. The output is rendered without additional sanitization, leading to a stored cross-site scripting (XSS) vulnerability visible to all site visitors.

Detection Guidance

Check if your Emlog installation is version 2.6.29 or earlier. Review article content for embedded HTML or script tags in Markdown. Inspect rendered pages for unescaped JavaScript execution.

Impact Analysis

An attacker could inject malicious scripts into articles. When other users view the page, the scripts execute in their browsers, potentially stealing session cookies, redirecting to phishing sites, or performing unauthorized actions on their behalf.

Compliance Impact

This vulnerability could lead to unauthorized access to user data, violating GDPR's data protection principles and HIPAA's security requirements for protected health information. Organizations may face fines or penalties for failing to protect user data adequately.

Mitigation Strategies

Upgrade Emlog to a patched version if available. If no patch exists, disable HTML rendering in Markdown or switch to a Markdown parser with safe mode enabled. Sanitize existing content to remove script tags.

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