Unauthenticated SSRF via predictable image-receiver hash
Published Jan 1, 2024 · Updated Jun 3, 2025
Server-side request forgery in SERVIT affiliate-toolkit before 3.4.3 allows remote attackers to request arbitrary URLs. The image-receiver endpoint accepts a base64-encoded URL and an MD5 hash derived from a predictable path or exposed key, then fetches the URL without fully blocking private addresses. No account is required, and successful exploitation makes the WordPress host send requests to RFC1918 services.
Summary
What happened
Server-side request forgery in SERVIT affiliate-toolkit before 3.4.3 allows remote attackers to request arbitrary URLs. The image-receiver endpoint accepts a base64-encoded URL and an MD5 hash derived from a predictable path or exposed key, then fetches the URL without fully blocking private addresses. No account is required, and successful exploitation makes the WordPress host send requests to RFC1918 services.
The record
- CVE
- CVE-2023-5877
- Published
- Jan 1, 2024
- Updated
- Jun 3, 2025
- Vendor
- SERVIT Software Solutions
- Product
- affiliate-toolkit
- Classifications
- CWE-918, CWE-862, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 1, 2024CVE publishedPublication date reported by the CVE source.
- Jun 3, 2025Record 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.
- Affected versionversion=0 <3.4.3
What conditions does exploitation require?
What is affected?
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.
Weakness, pattern, technique
Public exploit references
- WPScan image-receiver SSRF proof of conceptproof of concept · validated
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Technologies
Your stack
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Your stack
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