CVE-2019-11738

Severity: medium (CVSS 6.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2019-09-27 · updated 2026-06-17

Description

If a Content Security Policy (CSP) directive is defined that uses a hash-based source that takes the empty string as input, execution of any javascript: URIs will be allowed. This could allow for malicious JavaScript content to be run, bypassing CSP permissions. This vulnerability affects Firefox < 69 and Firefox ESR < 68.1.

Affected products

Mozilla Firefox: before 69.0 — fixed in 69.0
Mozilla Firefox ESR: before 68.1.0 — fixed in 68.1.0
openSUSE Leap: 15.0, 15.1

How to fix

Upgrade to a fixed version: Mozilla Firefox 69.0; Mozilla Firefox ESR 68.1.0. Check the vendor advisory for mitigations.

References

http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00011.html
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00017.html
https://bugzilla.mozilla.org/show_bug.cgi?id=1452037
https://www.mozilla.org/security/advisories/mfsa2019-25/
https://www.mozilla.org/security/advisories/mfsa2019-26/
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00011.html
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00017.html
https://bugzilla.mozilla.org/show_bug.cgi?id=1452037
https://www.mozilla.org/security/advisories/mfsa2019-25/
https://www.mozilla.org/security/advisories/mfsa2019-26/

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