CVE-2016-9073
WebExtensions can bypass security checks to load privileged URLs and potentially escape the WebExtension sandbox. This vulnerability affects Firefox < 50.
02 Description
WebExtensions can bypass security checks to load privileged URLs and potentially escape the WebExtension sandbox. This vulnerability affects Firefox < 50.
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 1.60% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 75.3% of scored records. A rank, not a probability.
- NVD base score
- 7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Moderate. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2018-06-11 21:00Z8 YR AGO
- Last updated
- 2024-08-06 02:42Z2 YR AGO
- Reserved
- 2016-10-27
- Assigning CNA
- mozilla
- Record state
- PUBLISHED
- Severity
- Not rated by the issuing CNA
- CNA CVSS vector
- Not published by the issuing CNA
- Weaknesses
- Data version
- 5.1
- Document digest
- 0c925651ab47be4fe7a9d3f843156dd6db673e6cf914cc8454a120bbfd45d8cd
05 Affected products
06 References
- www.securityfocus.com94337http://www.securityfocus.com/bid/94337
- www.securitytracker.com1037298http://www.securitytracker.com/id/1037298
- bugzilla.mozilla.orghttps://bugzilla.mozilla.org/show_bug.cgi?id=1289273
- www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2016-89/
07 Fixed in
Arch Linux
- firefox Fixed in 50.0-1
Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.
Ubuntu 14.04 LTS
- firefox Fixed in 50.0+build2-0ubuntu0.14.04.2
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 16.04 LTS
- firefox Fixed in 50.0+build2-0ubuntu0.16.04.2
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.