Rate-limit bypass via spoofed proxy headers
Published Nov 19, 2025 · Updated Nov 20, 2025
Authentication bypass in FileCodeBox 2.2 and earlier allows remote attackers to evade IP rate limits and brute-force share codes. IPRateLimit in apps/base/dependencies.py accepts X-Real-IP or X-Forwarded-For directly as the client address without verifying a trusted proxy. An unauthenticated network client can rotate either header to escape failed-attempt tracking, enabling high-volume code guessing or service interruption.
Summary
What happened
Authentication bypass in FileCodeBox 2.2 and earlier allows remote attackers to evade IP rate limits and brute-force share codes. IPRateLimit in apps/base/dependencies.py accepts X-Real-IP or X-Forwarded-For directly as the client address without verifying a trusted proxy. An unauthenticated network client can rotate either header to escape failed-attempt tracking, enabling high-volume code guessing or service interruption.
The record
- CVE
- CVE-2025-51663
- Published
- Nov 19, 2025
- Updated
- Nov 20, 2025
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-305, T1499.002
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Nov 19, 2025CVE publishedPublication date reported by the CVE source.
- Nov 20, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
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
- X-Real-IP and X-Forwarded-For rotation proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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