CVE-2019-11765

Severity: medium (CVSS 6.5 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: none known
Published: 2020-01-08 · updated 2026-06-17
Weakness: CWE-276

Description

A compromised content process could send a message to the parent process that would cause the 'Click to Play' permission prompt to be shown. However, due to lack of validation from the parent process, if the user accepted the permission request an attacker-controlled permission would be granted rather than the 'Click to Play' permission. This vulnerability affects Firefox < 70.

Affected products

Mozilla Firefox: before 70.0 — fixed in 70.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 70.0. Check the vendor advisory for mitigations.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1562582
https://www.mozilla.org/security/advisories/mfsa2019-34/
https://bugzilla.mozilla.org/show_bug.cgi?id=1562582
https://www.mozilla.org/security/advisories/mfsa2019-34/

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