Unauthenticated RCE via signature upload
Published Apr 19, 2022 · Updated Apr 28, 2026
Arbitrary file upload in E4J VikBooking Hotel Booking Engine & PMS 1.5.3 and earlier allows remote attackers to execute code via booking signatures. The storesignature handler accepts attacker-controlled data URLs, derives an extension from unvalidated text, decodes arbitrary base64 content, and writes it under the plugin's idscans directory. No login is required beyond a valid booking context; a crafted extension can place a PHP web shell, yielding server-side code execution.
Summary
What happened
Arbitrary file upload in E4J VikBooking Hotel Booking Engine & PMS 1.5.3 and earlier allows remote attackers to execute code via booking signatures. The storesignature handler accepts attacker-controlled data URLs, derives an extension from unvalidated text, decodes arbitrary base64 content, and writes it under the plugin's idscans directory. No login is required beyond a valid booking context; a crafted extension can place a PHP web shell, yielding server-side code execution.
The record
- CVE
- CVE-2022-27862
- Published
- Apr 19, 2022
- Updated
- Apr 28, 2026
- Vendor
- E4J s.r.l.
- Product
- VikBooking Hotel Booking Engine & PMS
- Classifications
- CWE-434, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 19, 2022CVE 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=<= 1.5.3 <=1.5.3
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
- VikBooking storesignature arbitrary file write and web-shell proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Reported exploitation
- CISA Known Exploited Vulnerabilities listingknown exploited catalog
Technologies
Your stack
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Your stack
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