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CVE-2018-12396
A vulnerability where a WebExtension can run content scripts in disallowed contexts following navigation or other events. This allows for…
Medium6.5EPSS 2.3%
- Published
- Updated
- Reserved
- Assigned by
- mozilla
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.0 | Medium6.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N |
- EPSS (exploitation in 30 days)
- 2.3% · top 17% of all CVEs (4 Nov 2026)
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The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.5.
Weakness
- WebExtension content scripts can execute in disallowed contexts
- CWE-732 (opens in a new tab)All about CWE-732 and its CVEs
Affected products
- affected unspecified – < 60.3
- affected unspecified – < 63
References (11)
- https://bugzilla.mozilla.org/show_bug.cgi?id=1483602 (opens in a new tab)x_refsource_CONFIRMx_transferred
- DSA-4324 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- https://www.mozilla.org/security/advisories/mfsa2018-26/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- GLSA-201811-04 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
- https://www.mozilla.org/security/advisories/mfsa2018-27/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- RHSA-2018:3005 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- 105718 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- RHSA-2018:3006 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- USN-3801-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- [debian-lts-announce] 20181107 [SECURITY] [DLA 1571-1] firefox-esr security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- 1041944 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2018-12396)Record last updated .