Platform
php
Component
emlog
Fixed in
2.5.20
CVE-2026-21433 describes a server-side request forgery (SSRF) vulnerability affecting Emlog CMS versions up to 2.5.19. An attacker can exploit this flaw by uploading a specially crafted SVG file, leading to outbound requests initiated by the server. This can expose sensitive internal network information and potentially lead to credential theft. A patch is available in version 2.5.20.
The SSRF vulnerability in Emlog allows an attacker to craft an SVG file containing external resource references. When Emlog processes this SVG (e.g., for thumbnail generation or preview), it makes an HTTP request to the attacker-controlled host. This outbound request can be used to probe internal network resources, access metadata, or even attempt to extract credentials stored within the Emlog environment. The potential impact includes unauthorized access to internal services, data exfiltration, and potentially even remote code execution if internal services are vulnerable. This attack pattern shares similarities with SSRF vulnerabilities seen in other CMS platforms where file processing routines are not adequately sanitized.
CVE-2026-21433 was publicly disclosed on 2026-01-02. No known public proof-of-concept exploits are currently available, but the SSRF nature of the vulnerability makes it likely that one will emerge. The EPSS score is pending evaluation. Monitor security advisories and threat intelligence feeds for any indications of active exploitation.
Exploit Status
EPSS
0.04% (13% percentile)
CISA SSVC
CVSS Vector
The primary mitigation for CVE-2026-21433 is to upgrade Emlog CMS to version 2.5.20 or later, which includes the fix for this SSRF vulnerability. If upgrading is not immediately feasible, consider implementing a Web Application Firewall (WAF) rule to block SVG file uploads or restrict outbound HTTP requests originating from the Emlog server. Additionally, review and restrict the permissions of the user account running the Emlog web server to minimize the potential impact of a successful SSRF attack. After upgrading, confirm the fix by attempting to upload a test SVG file containing a known external resource reference and verifying that the server does not initiate an outbound request.
Update Emlog to a patched version, if available. As no patched versions are known, it is recommended to monitor the vendor's security updates and apply the patch as soon as it is published. In the meantime, mitigation measures such as restricting SVG file uploads and validating external references in uploaded SVG files can be implemented.
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CVE-2026-21433 is a server-side request forgery (SSRF) vulnerability in Emlog CMS versions up to 2.5.19, allowing attackers to trigger outbound requests via SVG file uploads.
You are affected if you are running Emlog CMS versions 2.5.19 or earlier. Upgrade to 2.5.20 or later to mitigate the vulnerability.
Upgrade Emlog CMS to version 2.5.20 or later. As a temporary workaround, implement a WAF rule to block SVG file uploads.
No active exploitation has been confirmed as of the publication date, but the SSRF nature of the vulnerability suggests potential for future exploitation.
Refer to the official Emlog security advisory for detailed information and updates regarding CVE-2026-21433.
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