CVE-2018-5108
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.
Does this matter?
Lower severity and a low EPSS score (1.13%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.0
- 4.3 MEDIUMCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
- EPSS
- 1.13% probability · 66th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-200
- Affected
- mozilla/firefox · canonical/ubuntu linux
- Source
- security@mozilla.org
EPSS 1.1% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.securityfocus.com/bid/102786Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1040270Third Party Advisory, VDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1421099Issue Tracking, Permissions Required
- https://usn.ubuntu.com/3544-1/Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2018-02/Vendor Advisory
- http://www.securityfocus.com/bid/102786Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1040270Third Party Advisory, VDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1421099Issue Tracking, Permissions Required
- https://usn.ubuntu.com/3544-1/Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2018-02/Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.