CVE-2017-5386
CVSS v3
7.3
HIGH
EPSS Score
2.2 %
exploit probability, as of 2026-10-19
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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Affected and fixed versions
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Vendor advisories
Mozilla: WebExtensions can use data: protocol to affect other extensions (MFSA 2017-02)
Red Hat Security Advisory: firefox security update
Description
WebExtension scripts can use the "data:" protocol to affect pages loaded by other web extensions using this protocol, leading to potential data disclosure or privilege escalation in affected extensions. This vulnerability affects Firefox ESR < 45.7 and Firefox < 51.
Technical details
- Published
- 2018-06-11
Frequently asked questions
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