What’s Vulnerable › Vulnerabilities
CVE-2017-7803
- Severity: high (CVSS 7.5 v3.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 2.0% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2018-06-11 · updated 2026-06-17
- Weakness: CWE-269
Description
When a page's content security policy (CSP) header contains a "sandbox" directive, other directives are ignored. This results in the incorrect enforcement of CSP. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.
Affected products
- Debian Linux: 8.0, 9.0
- Mozilla Firefox: before 52.3.0; before 55.0 — fixed in 52.3.0, 55.0
- Mozilla Thunderbird: before 52.3.0 — fixed in 52.3.0
- RedHat Enterprise Linux Desktop: 6.0, 7.0
- RedHat Enterprise Linux Server: 6.0, 7.0
- RedHat Enterprise Linux Server Aus: 7.4
- RedHat Enterprise Linux Server Eus: 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; Mozilla Thunderbird 52.3.0. Check the vendor advisory for mitigations.
References
- http://www.securityfocus.com/bid/100234
- http://www.securitytracker.com/id/1039124
- https://access.redhat.com/errata/RHSA-2017:2456
- https://access.redhat.com/errata/RHSA-2017:2534
- https://bugzilla.mozilla.org/show_bug.cgi?id=1377426
- https://security.gentoo.org/glsa/201803-14
- https://www.debian.org/security/2017/dsa-3928
- https://www.debian.org/security/2017/dsa-3968
- https://www.mozilla.org/security/advisories/mfsa2017-18/
- https://www.mozilla.org/security/advisories/mfsa2017-19/
- https://www.mozilla.org/security/advisories/mfsa2017-20/
- http://www.securityfocus.com/bid/100234
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