CVE-2018-12396: canonical ubuntu_linux
Vulnerability summary
CVE-2018-12396 is a medium (CVSS 6.5) vulnerability in canonical ubuntu_linux. EPSS estimates a 2.27% chance of exploitation in the next 30 days, higher than 83% of scored vulnerabilities.
Not severe (CVSS 6.5, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 12 · Related 7Timeline
- 28-02-2019PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
A vulnerability where a WebExtension can run content scripts in disallowed contexts following navigation or other events. This allows for potential privilege escalation by the WebExtension on sites where content scripts should not be run. This vulnerability affects Firefox ESR < 60.3 and Firefox < 63.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated6.5MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
- OSV · DebianEcosystem advisory · calculated6.5MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
EPSS trend
Probability
2.27%
Chance of exploitation in the next 30 days
Percentile
83%
Versus all other CVEs
30-day change
No change 0.00 pp
From 2.27% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, user interaction (CVSS vector). Other conditions: not stated in public data.
Redhat6 products
- enterprise_linux_desktop6.0 | 7.0
- enterprise_linux_server6.0 | 7.0
- enterprise_linux_server_aus7.6
- enterprise_linux_server_eus7.6
- enterprise_linux_server_tus7.6
Ubuntu3 products
- firefox< 63.0+build2-0ubuntu0.14.04.2 | < 63.0+build2-0ubuntu0.16.04.2 | < 63.0+build2-0ubuntu0.18.04.2
- mozjs38All versions (No fix recorded)
- mozjs52All versions (No fix recorded)
Debian2 products
- firefox-esr< 60.3.0esr-1
- debian_linuxEOL8.0 | 9.0
Mozilla2 products
- firefox≥ unspecified, < 63 | < 63.0
- firefox esr≥ unspecified, < 60.3 | < 60.3
Canonical1 product
- ubuntu_linuxEOL14.04 | 16.04 | 18.04 | 18.10
5 vendors · 14 products
References
17 links- bugzilla.mozilla.org/show_bug.cgi?id=1483602X Refsource CONFIRMBroken LinkIssue TrackingVendor Advisory
- lists.debian.org/debian-lts-announce/2018/11/msg00008.htmlMailing ListX Refsource MLISTThird Party Advisory