CVE-2021-42078

PHP Event Calendar through 2021-11-04 allows persistent cross-site scripting (XSS), as demonstrated by the /server/ajax/events_manager.php title parameter. This can be exploited by an adversary in multiple ways, e.g., to perform actions on the page in the context of other users, or to deface the site.

CVSS v3.1

6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS v2.0

4.3 MEDIUMAV:N/AC:M/Au:N/C:N/I:P/A:N

EPSS

0.89% chance of exploitation in the next 30 days, 57th percentile

Published

2021-11-08

Updated

2024-08-04

Proof-of-concept exploits (2)

• http://seclists.org/fulldisclosure/2021/Nov/24
• https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2021-049.txt

References

• CVE Record
• NVD entry

Related

• CVE-2021-42077
• CVE-2021-42079
• CVE-2021-42071
• CVE-2021-4208
• CVE-2021-42063
• CVE-2021-42080