firefox: WebExtension content scripts can be loaded in about: pages
Published Feb 28, 2019
6.5
MEDIUMCVSS 3.0
EPSS 1.93%
Description
WebExtension content scripts can be loaded into about: pages in some circumstances, in violation of the permissions granted to extensions. This could allow an extension to interfere with the loading and usage of these pages and use capabilities that were intended to be restricted from extensions. This vulnerability affects Firefox < 64.
Affected products
-
- Version unspecifiedStatusaffectedConstraints<64
- Version
Configuration 2
- 14.04
- 16.04
- 18.04
- 18.10
No data.
Red Hat Enterprise Linux 6
firefox
Will not fix
Red Hat Enterprise Linux 7
firefox
Will not fix
Red Hat Enterprise Linux 8
firefox
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | firefox | Will not fix | n/a |
| Red Hat Enterprise Linux 7 | firefox | Will not fix | n/a |
| Red Hat Enterprise Linux 8 | firefox | Will not fix | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
AV:N/AC:M/Au:N/C:P/I:N/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (13 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.93% (0.01931) | 79.28th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.67% (0.01665) | 73.60th | v5 (v2026.06.15) |
| Mar 30, 2025 | 0.73% (0.00725) | 70.27th | v4 (v2025.03.14) |
| Mar 29, 2025 | 2.17% (0.02170) | 73.83th | v4 (v2025.03.14) |
| Jul 20, 2024 | 0.26% (0.00255) | 65.75th | v3 (v2023.03.01) |
| Feb 22, 2024 | 0.26% (0.00255) | 64.48th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.29% (0.00285) | 67.84th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.29% (0.00285) | 64.69th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.32% (0.00317) | 65.65th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.02% (0.01018) | 40.69th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.02% (0.01018) | 19.50th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.10% (0.01105) | 29.18th | v5 (v2026.06.15) |
| Apr 14, 2021 | 1.10% (0.01105) | 0.00th | v1 |
References (8)
- http://www.securityfocus.com/bid/106167 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://access.redhat.com/security/cve/CVE-2018-18495 Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1427585 x_refsource_CONFIRMIssue TrackingPermissions RequiredVendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1696138 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2018-18495
- https://usn.ubuntu.com/3844-1/ vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2018-18495
- https://www.mozilla.org/security/advisories/mfsa2018-29/ x_refsource_CONFIRMVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.securityfocus.com/bid/106167 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| https://access.redhat.com/security/cve/CVE-2018-18495 | Vendor Advisory | |
| https://bugzilla.mozilla.org/show_bug.cgi?id=1427585 | x_refsource_CONFIRMIssue TrackingPermissions RequiredVendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1696138 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2018-18495 | ||
| https://usn.ubuntu.com/3844-1/ | vendor-advisoryx_refsource_UBUNTUThird Party Advisory | |
| https://www.cve.org/CVERecord?id=CVE-2018-18495 | ||
| https://www.mozilla.org/security/advisories/mfsa2018-29/ | x_refsource_CONFIRMVendor Advisory |
Change history (0)
No recorded changes yet.