CVE-2018-5108

Severity: medium (CVSS 4.3 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% 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-200

Description

A Blob URL can violate origin attribute segregation, allowing it to be accessed from a private browsing tab and for data to be passed between the private browsing tab and a normal tab. This could allow for the leaking of private information specific to the private browsing context. This issue is mitigated by the requirement that the user enter the Blob URL manually in order for the access violation to occur. This vulnerability affects Firefox < 58.

Affected products

Canonical Ubuntu Linux: 14.04, 16.04, 17.10
Mozilla Firefox: through 57.0.4

References

http://www.securityfocus.com/bid/102786
http://www.securitytracker.com/id/1040270
https://bugzilla.mozilla.org/show_bug.cgi?id=1421099
https://usn.ubuntu.com/3544-1/
https://www.mozilla.org/security/advisories/mfsa2018-02/
http://www.securityfocus.com/bid/102786
http://www.securitytracker.com/id/1040270
https://bugzilla.mozilla.org/show_bug.cgi?id=1421099
https://usn.ubuntu.com/3544-1/
https://www.mozilla.org/security/advisories/mfsa2018-02/

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