CVE-2023-23921: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

February 17, 2023 (updated February 28, 2023)

The vulnerability was found Moodle which exists due to insufficient sanitization of user-supplied data in some returnurl parameters. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user’s browser in context of vulnerable website. This flaw allows a remote attacker to perform cross-site scripting (XSS) attacks.

References

git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-76810
bugzilla.redhat.com/show_bug.cgi?id=2162526
moodle.org/mod/forum/discuss.php?d=443272
nvd.nist.gov/vuln/detail/CVE-2023-23921

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