Unauthenticated IP-filter bypass via spoofed client address
Published Jun 4, 2024 · Updated Apr 28, 2026
Authentication bypass in yonifre Maspik – Multi-Layer Spam Protection 0.10.3 and earlier allows remote attackers to evade IP filtering. The visitor-IP check accepts a client-supplied address as the request source and evaluates that spoofed value against IP and country rules. No authentication or user interaction is required; the bypass permits form submissions that configured IP-based controls should reject.
Summary
What happened
Authentication bypass in yonifre Maspik – Multi-Layer Spam Protection 0.10.3 and earlier allows remote attackers to evade IP filtering. The visitor-IP check accepts a client-supplied address as the request source and evaluates that spoofed value against IP and country rules. No authentication or user interaction is required; the bypass permits form submissions that configured IP-based controls should reject.
The record
- CVE
- CVE-2023-48271
- Published
- Jun 4, 2024
- Updated
- Apr 28, 2026
- Vendor
- yonifre
- Product
- Maspik – Multi-Layer Spam Protection
- Classifications
- CWE-290, CAPEC-1, T1562.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 4, 2024CVE publishedPublication date reported by the CVE source.
- Apr 28, 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.
- Affected versionversion=n/a <=0.10.3 changes=[{"at":"0.10.4","status":"unaffected"}]
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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