CVE-2026-53758Public exploitNetwork attack vectorHinoki check available

Stored XSS via unsafe Parsedown article rendering

Published Sep 4, 2026 · Updated Sep 4, 2026

Stored XSS in emlog 2.6.29 and earlier allows remote authenticated users to execute script in article readers' browsers. The article-rendering logic in include/lib/function.base.php passes Markdown content through Parsedown without safe mode, then emits the result without sanitization. An author or administrator must save a crafted article; every visitor who opens it executes the stored HTML in the site's origin, exposing sessions and enabling actions as the victim.

CVSS severity8.7
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Stored XSS in emlog 2.6.29 and earlier allows remote authenticated users to execute script in article readers' browsers. The article-rendering logic in include/lib/function.base.php passes Markdown content through Parsedown without safe mode, then emits the result without sanitization. An author or administrator must save a crafted article; every visitor who opens it executes the stored HTML in the site's origin, exposing sessions and enabling actions as the victim.

The record

CVE
CVE-2026-53758
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
emlog
Product
emlog
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 2.6.29

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

emlog · emlogversion=<= 2.6.29

Published CVSS scores

8.7GitHub CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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