What’s Vulnerable › Vulnerabilities

CVE-2017-7798

• Severity: high (CVSS 8.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-06-11 · updated 2026-06-17
• Weakness: CWE-94

Description

The Developer Tools feature suffers from a XUL injection vulnerability due to improper sanitization of the web page source code. In the worst case, this could allow arbitrary code execution when opening a malicious page with the style editor tool. This vulnerability affects Firefox ESR < 52.3 and Firefox < 55.

Affected products

• Debian Linux: 8.0, 9.0
• Mozilla Firefox: before 55.0; before 52.3.0 — fixed in 52.3.0, 55.0
• Red Hat Enterprise Linux: 6.0, 7.0
• RedHat Enterprise Linux Desktop: 6.0, 7.0
• RedHat Enterprise Linux Server: 6.0, 7.0
• RedHat Enterprise Linux Server Aus: 7.3, 7.4
• RedHat Enterprise Linux Server Eus: 7.3, 7.4, 7.5
• RedHat Enterprise Linux Workstation: 6.0, 7.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 52.3.0, 55.0. Check the vendor advisory for mitigations.

References

• http://www.securityfocus.com/bid/100198
• http://www.securitytracker.com/id/1039124
• https://access.redhat.com/errata/RHSA-2017:2456
• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1371586%2C1372112
• https://www.debian.org/security/2017/dsa-3928
• https://www.mozilla.org/security/advisories/mfsa2017-18/
• https://www.mozilla.org/security/advisories/mfsa2017-19/
• http://www.securityfocus.com/bid/100198
• http://www.securitytracker.com/id/1039124
• https://access.redhat.com/errata/RHSA-2017:2456
• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1371586%2C1372112
• https://www.debian.org/security/2017/dsa-3928

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