CVE-2021-40509

Public Exploit

Description

ViewCommon.java in JForum2 2.7.0 allows XSS via a user signature.

Category

5.4
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.33%
Third-Party Advisory packetstormsecurity.com Third-Party Advisory seclists.org Third-Party Advisory openwall.net Third-Party Advisory sourceforge.net
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://packetstormsecurity.com/files/164045/jforum-2.7.0-Cross-Site-Scripting.html third party advisory
https://lists.openwall.net/full-disclosure/2021/09/03/7 mailing list exploit third party advisory
https://sourceforge.net/p/jforum2/code/934/ third party advisory patch
http://seclists.org/fulldisclosure/2021/Sep/13 third party advisory mailing list

Frequently Asked Questions

What is the severity of CVE-2021-40509?
CVE-2021-40509 has been scored as a medium severity vulnerability.
How to fix CVE-2021-40509?
To fix CVE-2021-40509, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-40509 being actively exploited in the wild?
It is possible that CVE-2021-40509 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.