Stored XSS via unsanitized virtual-event meeting URL
Published Oct 16, 2023 · Updated Apr 23, 2025
Stored XSS in Ashan Perera EventON – Events Calendar before 2.2 allows remote authenticated users to execute script via a meeting URL. The virtual-event editor stores the Meeting URL without sanitizing or escaping it, then renders the value in the published event page. Administrator access is required to save the payload, and a visitor must view the affected event for the script to run in that visitor’s browser.
Summary
What happened
Stored XSS in Ashan Perera EventON – Events Calendar before 2.2 allows remote authenticated users to execute script via a meeting URL. The virtual-event editor stores the Meeting URL without sanitizing or escaping it, then renders the value in the published event page. Administrator access is required to save the payload, and a visitor must view the affected event for the script to run in that visitor’s browser.
The record
- CVE
- CVE-2023-4388
- Published
- Oct 16, 2023
- Updated
- Apr 23, 2025
- Vendor
- Ashan Perera
- Product
- EventON – Events Calendar
- Classifications
- CWE-79, T1059.007
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Oct 16, 2023CVE publishedPublication date reported by the CVE source.
- Apr 23, 2025Record 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 <2.2
What conditions does exploitation require?
What is affected?
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
- WPScan EventON Meeting URL proof of conceptproof of concept · validated
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Technologies
Your stack
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Your stack
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