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CVE-2026-21431— Emlog vulnerable to stored Cross-site Scripting via image name

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开源的一套基于PHP和MySQL的CMS建站系统。 Emlog 2.5.23版本存在跨站脚本漏洞，该漏洞源于资源媒体库功能存在存储型跨站脚本漏洞。

AI Predicted 4.3 Difficulty: Easy EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise
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I. Basic Information for CVE-2026-21431

Vulnerability Information
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Vulnerability Title
Emlog vulnerable to stored Cross-site Scripting via image name
Source: CVE Program / CVE List V5
Vulnerability Description
Emlog is an open source website building system. Version 2.5.23 has a stored cross-site scripting vulnerability in the `Resource media library ` function while publishing an article. As of time of publication, no known patched versions are available.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:P
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开源的一套基于PHP和MySQL的CMS建站系统。 Emlog 2.5.23版本存在跨站脚本漏洞，该漏洞源于资源媒体库功能存在存储型跨站脚本漏洞。
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 = 2.5.23 -

II. Public POCs for CVE-2026-21431

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III. Intelligence Information for CVE-2026-21431

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Vendor Advisories for CVE-2026-21431 (1)

Same Patch Batch · emlog · 2026-01-02 · 5 CVEs total

CVE-2026-21433 7.7 HIGH Emlog vulnerable to Server-Side Request Forgery (SSRF)
CVE-2026-21430 Emlog: CSRF chained with stored XSS leads to ATO
CVE-2026-21432 Emlog has stored Cross-site Scripting issue that can lead to admin or another account ATO
CVE-2026-21429 Emlog has Broken Access Control (BAC)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-21431

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