Subscriber-level file deletion via cache path traversal
Published Jul 24, 2026 · Updated Jul 24, 2026
Path traversal in POSIMYTH Innovations Nexter Blocks 5.0.0 and earlier allows remote authenticated users to delete CSS or JS files. The cache-clear handler uses the plus_name value to construct a cache path without rejecting directory traversal sequences before deletion. Subscriber-level access is sufficient, and deletion is limited to CSS and JS assets but can disrupt a site or destroy plugin and theme resources.
Summary
What happened
Path traversal in POSIMYTH Innovations Nexter Blocks 5.0.0 and earlier allows remote authenticated users to delete CSS or JS files. The cache-clear handler uses the plus_name value to construct a cache path without rejecting directory traversal sequences before deletion. Subscriber-level access is sufficient, and deletion is limited to CSS and JS assets but can disrupt a site or destroy plugin and theme resources.
The record
- CVE
- CVE-2026-15420
- Published
- Jul 24, 2026
- Updated
- Jul 24, 2026
- Vendor
- POSIMYTH Innovations
- Product
- Nexter Blocks
- Classifications
- CWE-22, T1485
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 24, 2026CVE publishedPublication date reported by the CVE source.
- Jul 24, 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=0 <=5.0.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
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
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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