What’s Vulnerable › Vulnerabilities

CVE-2021-39249

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-08-17 · updated 2026-06-17
• Weakness: CWE-330

Description

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.

Affected products

• Kaspersky Lab Invision Power Board: before 4.6.5.1 — fixed in 4.6.5.1

How to fix

Upgrade to a fixed version: Kaspersky Lab Invision Power Board 4.6.5.1. Check the vendor advisory for mitigations.

References

• https://invisioncommunity.com/release-notes/4651-r102/
• https://ssd-disclosure.com/ssd-advisory-ip-board-stored-xss-to-rce-chain/
• https://invisioncommunity.com/release-notes/4651-r102/
• https://ssd-disclosure.com/ssd-advisory-ip-board-stored-xss-to-rce-chain/

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