CVE-2021-40509
MEDIUMCVSS 5.4/10EPSS 0.93%
Last modified
CVE-2021-40509 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. ViewCommon.java in JForum2 2.7.0 allows XSS via a user signature.. EPSS estimates a 0.93% chance of exploitation in the next 30 days.
Description
ViewCommon.java in JForum2 2.7.0 allows XSS via a user signature.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Jforum | Jforum | 2.7.0 |
References
- http://seclists.org/fulldisclosure/2021/Sep/13Mailing List, Third Party Advisory
- https://lists.openwall.net/full-disclosure/2021/09/03/7Exploit, Mailing List, Third Party Advisory
- https://sourceforge.net/p/jforum2/code/934/Patch, Third Party Advisory
- http://seclists.org/fulldisclosure/2021/Sep/13Mailing List, Third Party Advisory
- https://lists.openwall.net/full-disclosure/2021/09/03/7Exploit, Mailing List, Third Party Advisory
- https://sourceforge.net/p/jforum2/code/934/Patch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-40509?
ViewCommon.java in JForum2 2.7.0 allows XSS via a user signature.
How severe is CVE-2021-40509?
CVE-2021-40509 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.93% probability of exploitation in the next 30 days.
How do I fix CVE-2021-40509?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-40509?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST