Limitations on the URIs allowed to WebExtensions by the browser.windows.create API can be bypassed when a pipe in the URL field is used within the extension to load multiple pages as a single argument. This could allow a malicious WebExtension to open privileged about: or file: locations. This vulnerability affects Firefox < 64.
CVE-2018-18497
MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence
Score 6.5 from GitHub Security Advisory published 2022-05-13. NVD baseline CVSS 6.5; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 1%CVSS: 6.5Exploit: NoneExposed: 0
A fix is available — apply it.
- CVSS v3
- 6.5
- EG Score
- 6.5(medium)
- EPSS
- 69.6%
- KEV
- Not listed
Published
February 28, 2019
Last Modified
November 21, 2024
References (8)
- security@mozillahttp://www.securityfocus.com/bid/106167
- security@mozillahttps://bugzilla.mozilla.org/show_bug.cgi?id=1488180
- security@mozillahttps://usn.ubuntu.com/3844-1/
- security@mozillahttps://www.mozilla.org/security/advisories/mfsa2018-29/
- af854a3a-2127-422b-91ae-364da2661108http://www.securityfocus.com/bid/106167
- af854a3a-2127-422b-91ae-364da2661108https://bugzilla.mozilla.org/show_bug.cgi?id=1488180
- af854a3a-2127-422b-91ae-364da2661108https://usn.ubuntu.com/3844-1/
- af854a3a-2127-422b-91ae-364da2661108https://www.mozilla.org/security/advisories/mfsa2018-29/
Frequently asked(5)
What is CVE-2018-18497?
CVE-2018-18497 is a medium vulnerability published on February 28, 2019. Limitations on the URIs allowed to WebExtensions by the browser.windows.create API can be bypassed when a pipe in the URL field is used within the extension to load multiple pages as a single argument. This could allow a malicious WebExtension to open privileged about: or file: locations. This…
When was CVE-2018-18497 disclosed?
CVE-2018-18497 was first published in the National Vulnerability Database on February 28, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-18497 actively exploited?
CVE-2018-18497 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 69.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2018-18497?
CVE-2018-18497 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2018-18497?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-18497, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
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