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Emlog CVE-2026-21433

HIGH
Server-Side Request Forgery (SSRF) (CWE-918)
2026-01-02 security-advisories@github.com
SSRF Emlog
7.7
CVSS 3.1 · GitHub Advisory
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Severity by source

GitHub Advisory PRIMARY
7.7 HIGH
AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

3
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
PoC Detected
Jan 16, 2026 - 18:11 vuln.today
Public exploit code
CVE Published
Jan 02, 2026 - 19:15 nvd
HIGH 7.7

DescriptionGitHub Advisory

Emlog is an open source website building system. Versions up to and including 2.5.19 are vulnerable to server-side Out-of-Band (OOB) requests / SSRF via uploaded SVG files. An attacker can upload a crafted SVG to http[:]//emblog/admin/media[.]php which contains external resource references. When the server processes/renders the SVG (thumbnailing, preview, or sanitization), it issues an HTTP request to the attacker-controlled host. Impact: server-side SSRF/OOB leading to internal network probing and potential metadata/credential exposure. As of time of publication, no known patched versions are available.

AnalysisAI

Server-side request forgery (SSRF) in Emlog up to version 2.5.19 allows authenticated attackers to make arbitrary HTTP requests by uploading malicious SVG files to the media upload endpoint, enabling internal network reconnaissance and potential credential exposure when the server processes the files. Public exploit code exists for this vulnerability and no patches are currently available. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate to Emlog admin panel
Delivery
Upload crafted SVG with external resource references
Exploit
Server processes SVG file
Execution
Issues SSRF request to attacker-controlled host
Impact
Probe internal network resources
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Vulnerability AssessmentAI

Exploitation Emlog versions up to 2.5.19 with SVG upload functionality in admin/media.php accessible to authenticated users. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 7.7 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A remote attacker (requires authentication) could exploit this flaw, internal network probing and potential metadata/credential e.
Remediation Monitor vendor advisories for a patch. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 7 days: Identify all affected systems and apply vendor patches promptly. …

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CVE-2026-21433 vulnerability details – vuln.today
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