PatchTheCVECVE-2021-39249: Invision Community (aka IPS Community Suite or IP-Board) before 4.6.5.1 allows reflected XSS because the filen
CVE-2021-39249 is a medium-severity flaw (CVSS 6.1) affecting invision power board. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Invision Community (aka IPS Community Suite or IP-Board) before 4.6.5.1 allows reflected XSS because the filenames of uploaded files become predictable through a brute-force attack against the PHP mt_rand function.
Why this priority
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.1 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 0.8% (top 44%) |
| CISA exploited list | No |
| Weakness | CWE-330 |
| Published | 2021-08-17 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-39249?
invision power board: upgrade to 4.6.5.1. Exact commands for each OS are on this page.
Is CVE-2021-39249 being exploited?
CVE-2021-39249 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-39249 affect?
CVE-2021-39249 affects invision power board. Severity is medium (CVSS 6.1). Invision Community (aka IPS Community Suite or IP-Board) before 4.6.5.1 allows reflected XSS because the filenames of uploaded files become predictable through a brute-force attack against the PHP mt_rand function.
How urgent is CVE-2021-39249?
Priority 40/100. Public exploit reference
Software pages
Related CVEs
- CVE-2021-39250 MEDIUM 5.4 UPGRADE Invision Community (aka IPS Community Suite or IP-Board) before 4.6.5.1 allows stored XSS, with resultant code
- CVE-2019-8278 MEDIUM 6.1 UPGRADE Stored XSS in Invision Power Board versions 3.3.1 - 3.4.8 leads to Remote Code Execution.
- CVE-2017-8899 HIGH 8.1 UPGRADE Invision Power Services (IPS) Community Suite 4.1.19.2 and earlier has a composite of Stored XSS and Informati
- CVE-2017-8898 CRITICAL 9.8 UPGRADE Invision Power Services (IPS) Community Suite 4.1.19.2 and earlier has stored XSS in the Announcements, allowi
- CVE-2017-8897 MEDIUM 6.1 UPGRADE Invision Power Services (IPS) Community Suite 4.1.19.2 and earlier has pre-auth reflected XSS in the IPS UTF8