Advisory Published


First published: Tue Nov 21 2023(Updated: )

An attacker could have performed HTML template injection via Reader Mode and exfiltrated user information.


Affected SoftwareAffected VersionHow to fix
All of
Mozilla Firefox=120
Apple iOS
Mozilla Firefox<120.0

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Parent vulnerabilities

(Appears in the following advisories)

Peer vulnerabilities

(Found alongside the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID for this vulnerability?

    The vulnerability ID for this vulnerability is CVE-2023-49061.

  • What is the severity of CVE-2023-49061?

    The severity of CVE-2023-49061 is medium.

  • How does CVE-2023-49061 affect Firefox for iOS?

    CVE-2023-49061 affects Firefox for iOS versions prior to 120.

  • What is HTML template injection?

    HTML template injection is a vulnerability that allows an attacker to inject malicious HTML code into a web application.

  • How can an attacker exploit CVE-2023-49061?

    An attacker can exploit CVE-2023-49061 by performing HTML template injection via Reader Mode and exfiltrating user information.


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