Unauthenticated file write via unprotected imageupload endpoint
Published Jul 20, 2026 · Updated Jul 20, 2026
Unrestricted file upload in DJ-Extensions DJ-Classifieds 3.11.1 and earlier allows remote attackers to write files without authentication. The imageupload task writes attacker-named request bodies into tmp/djupload without a login or CSRF token, while its three-string blocklist misses valid image polyglots containing other PHP syntax. A default stack serves the planted image inertly, but permissive PHP handling or a local-file-inclusion chain turns it into command execution; otherwise, attackers retain arbitrary content storage and disk consumption.
Summary
What happened
Unrestricted file upload in DJ-Extensions DJ-Classifieds 3.11.1 and earlier allows remote attackers to write files without authentication. The imageupload task writes attacker-named request bodies into tmp/djupload without a login or CSRF token, while its three-string blocklist misses valid image polyglots containing other PHP syntax. A default stack serves the planted image inertly, but permissive PHP handling or a local-file-inclusion chain turns it into command execution; otherwise, attackers retain arbitrary content storage and disk consumption.
The record
- CVE
- CVE-2026-61424
- Published
- Jul 20, 2026
- Updated
- Jul 20, 2026
- Vendor
- DJ-Extensions
- Product
- DJ-Classifieds
- Classifications
- CWE-434, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 16, 2026Exploitation reportedAnonymous imageupload probing and file drop
- Jul 20, 2026CVE publishedPublication date reported by the CVE source.
- Jul 20, 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=1.0-3.11.1
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
- CVE-2026-61424 proof-of-concept exploitfunctional · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Reported exploitation
- Anonymous imageupload probing and file dropreported exploitation
Technologies
Your stack
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Your stack
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