Mozilla: WebExtensions can use data: protocol to affect other extensions (MFSA 2017-02)
Published Jun 11, 2018
7.3
HIGHCVSS 3.0
EPSS 2.27%
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.
Affected products
-
- Version unspecifiedStatusaffectedConstraints<51
- Version
-
- Version unspecifiedStatusaffectedConstraints<45.7
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Mozilla | Firefox | n/a |
| ||||||
| Mozilla | Firefox ESR | n/a |
|
Configuration 1
- 8.0
Configuration 2
- 5.0
- 6.0
- 7.0
- 5.0
- 6.0
- 7.0
- 5.0
- 6.0
- 7.0
- 7.3
- 7.4
- 7.3
- 7.4
- 7.5
- 5.0
- 6.0
- 7.0
No data.
Red Hat Enterprise Linux 5
firefox-0:45.7.0-2.el5_11
Fixed · RHSA-2017:0190
Red Hat Enterprise Linux 6
firefox-0:45.7.0-2.el6_8
Fixed · RHSA-2017:0190
Red Hat Enterprise Linux 7
firefox-0:45.7.0-2.el7_3
Fixed · RHSA-2017:0190
Red Hat Enterprise Linux 5
thunderbird
Not affected
Red Hat Enterprise Linux 6
thunderbird
Not affected
Red Hat Enterprise Linux 7
thunderbird
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | firefox-0:45.7.0-2.el5_11 | Fixed | RHSA-2017:0190 |
| Red Hat Enterprise Linux 6 | firefox-0:45.7.0-2.el6_8 | Fixed | RHSA-2017:0190 |
| Red Hat Enterprise Linux 7 | firefox-0:45.7.0-2.el7_3 | Fixed | RHSA-2017:0190 |
| Red Hat Enterprise Linux 5 | thunderbird | Not affected | n/a |
| Red Hat Enterprise Linux 6 | thunderbird | Not affected | n/a |
| Red Hat Enterprise Linux 7 | thunderbird | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
AV:N/AC:L/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (13 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.27% (0.02269) | 82.43th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.23% (0.02226) | 80.35th | v5 (v2026.06.15) |
| Mar 17, 2025 | 1.25% (0.01249) | 77.94th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.27% (0.00269) | 68.69th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.38% (0.00382) | 72.29th | v3 (v2023.03.01) |
| Dec 12, 2023 | 0.38% (0.00382) | 70.01th | v3 (v2023.03.01) |
| Nov 2, 2023 | 0.45% (0.00453) | 72.45th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.45% (0.00446) | 71.79th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.38% (0.00375) | 68.46th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.18% (0.01183) | 61.76th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.18% (0.01183) | 35.15th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.98% (0.01979) | 50.12th | v5 (v2026.06.15) |
| Apr 14, 2021 | 1.98% (0.01979) | 0.00th | v1 |
No CWE recorded.
References (13)
- http://rhn.redhat.com/errata/RHSA-2017-0190.html vendor-advisoryx_refsource_REDHATThird Party Advisory
- http://www.securityfocus.com/bid/95769 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1037693 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- https://access.redhat.com/security/cve/CVE-2017-5386 Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1319070 x_refsource_CONFIRMExploitIssue TrackingPatchVendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1416282 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2017-5386
- https://security.gentoo.org/glsa/201702-22 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2017-5386
- https://www.debian.org/security/2017/dsa-3771 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- https://www.mozilla.org/en-US/security/advisories/mfsa2017-02/#CVE-2017-5386
- https://www.mozilla.org/security/advisories/mfsa2017-01/ x_refsource_CONFIRMVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-02/ x_refsource_CONFIRMVendor Advisory
Change history (0)
No recorded changes yet.