Cross-origin bypass in Mozilla Firefox - CVE-2018-5136
Published: March 13, 2018
Vulnerability identifier: #VU10980
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2018-5136
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform XSS attacks.
The vulnerability exists due to insufficient sanitization of user-supplied data. A remote attacker can share a shared worker created from a data: URL in one tab by another tab with a different origin and bypass the same-origin policy.
Affected software
Mozilla Firefox
firefox (Ubuntu package)
firefox (Ubuntu package)
How to mitigate CVE-2018-5136
Update to version 59.0.
firefox (Ubuntu package) - addressed in versions 59.0+build5-0ubuntu0.14.04.1, 59.0+build5-0ubuntu0.16.04.1, 59.0+build5-0ubuntu0.17.10.1