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CVE-2017-5386

WebExtension scripts can use the "data:" protocol to affect pages loaded by other web extensions using this protocol, leading to potential…

High7.3EPSS 2.2%
Published
Updated
Reserved
Assigned by
mozilla

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.

Scores

CVSS scores of CVE-2017-5386, by who scored it
Scored byCVSSScoreVector
NVDNVD · Modified3.0High7.3CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
EPSS (exploitation in 30 days)
2.2% · top 17% of all CVEs (3 Nov 2026)

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The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.3.

Weakness

  • WebExtensions can use data: protocol to affect other extensions

Affected products

  • Mozilla · Firefox ESR

    • affected unspecified – < 45.7

  • Mozilla · Firefox

    • affected unspecified – < 51

References (8)

Sources

The same CVE in the primary databases and aggregators, to check against.

Record last updated .