CVE-2019-3635: MWG Proxy: Cross-Frame Scripting vulnerability

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-08-14 · updated 2026-06-17

Description

Exfiltration of Data in McAfee Web Gateway (MWG) 7.8.2.x prior to 7.8.2.12 allows attackers to obtain sensitive data via crafting a complex webpage that will trigger the Web Gateway to block the user accessing an iframe.

Affected products

McAfee Web Gateway (MWG): from 7.8.2.0 before 7.8.2.12 — fixed in 7.8.2.12

How to fix

Upgrade to a fixed version: McAfee Web Gateway (MWG) 7.8.2.12. Check the vendor advisory for mitigations.

References

https://kc.mcafee.com/corporate/index?page=content&id=SB10293
https://kc.mcafee.com/corporate/index?page=content&id=SB10293

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