CVE-2018-12358 — Mozilla: Same-origin bypass using service worker and redirection

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MEDIUM

Mozilla: Same-origin bypass using service worker and redirection

Published Oct 18, 2018

4.3

MEDIUM

CVSS 3.0

EPSS 1.27%

Description

Service workers can use redirection to avoid the tainting of cross-origin resources in some instances, allowing a malicious site to read responses which are supposed to be opaque. This vulnerability affects Firefox < 61.

Affected products

Vendor Mozilla Product Firefox Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <61

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

Version	Status	Constraints
unspecified	affected	<61

Red Hat Enterprise Linux 6

firefox

Not affected
Red Hat Enterprise Linux 6

thunderbird

Not affected
Red Hat Enterprise Linux 7

firefox

Not affected
Red Hat Enterprise Linux 7

thunderbird

Not affected

Product	Package	State	Advisory
Red Hat Enterprise Linux 6	firefox	Not affected	n/a
Red Hat Enterprise Linux 6	thunderbird	Not affected	n/a
Red Hat Enterprise Linux 7	firefox	Not affected	n/a
Red Hat Enterprise Linux 7	thunderbird	Not affected	n/a

Remediation

No remediation recorded yet.

Metrics

1.27% 0.01274

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.01274

Score over time

2021–2026

EPSS v1
EPSS v5
EPSS v2
EPSS v3

Percentile over time

EPSS v1
EPSS v5
EPSS v2
EPSS v3

Table of values (11 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	1.27% (0.01274)	68.85th	v5 (v2026.06.15)
Sep 20, 2026	1.27% (0.01274)	68.61th	v5 (v2026.06.15)
Jul 20, 2024	0.29% (0.00289)	69.23th	v3 (v2023.03.01)
Mar 10, 2024	0.29% (0.00289)	68.25th	v3 (v2023.03.01)
Feb 8, 2024	0.46% (0.00459)	74.59th	v3 (v2023.03.01)
Oct 12, 2023	0.46% (0.00459)	72.49th	v3 (v2023.03.01)
Mar 7, 2023	0.51% (0.00513)	73.02th	v3 (v2023.03.01)
Mar 6, 2023	1.02% (0.01018)	40.69th	v2 (v2022.01.01)
Feb 4, 2022	1.02% (0.01018)	19.50th	v2 (v2022.01.01)
Feb 3, 2022	1.25% (0.01247)	30.57th	v5 (v2026.06.15)
Apr 14, 2021	1.25% (0.01247)	0.00th	v1

Weaknesses (2)

CWE-200

Exposure of Sensitive Information

CWE-829

References (10)

http://www.securitytracker.com/id/1041193
vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
https://access.redhat.com/security/cve/CVE-2018-12358
Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1467852
x_refsource_CONFIRMIssue TrackingPermissions Required
https://bugzilla.redhat.com/show_bug.cgi?id=1595023
Issue Tracking
https://nvd.nist.gov/vuln/detail/CVE-2018-12358
https://security.gentoo.org/glsa/201810-01
vendor-advisoryx_refsource_GENTOOMitigationThird Party Advisory
https://usn.ubuntu.com/3705-1/
vendor-advisoryx_refsource_UBUNTUThird Party Advisory
https://www.cve.org/CVERecord?id=CVE-2018-12358
https://www.mozilla.org/en-US/security/advisories/mfsa2018-16/#CVE-2018-12358
https://www.mozilla.org/security/advisories/mfsa2018-15/
x_refsource_CONFIRMVendor Advisory

Link	Providers	Tags
http://www.securitytracker.com/id/1041193		vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
https://access.redhat.com/security/cve/CVE-2018-12358		Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1467852		x_refsource_CONFIRMIssue TrackingPermissions Required
https://bugzilla.redhat.com/show_bug.cgi?id=1595023		Issue Tracking
https://nvd.nist.gov/vuln/detail/CVE-2018-12358
https://security.gentoo.org/glsa/201810-01		vendor-advisoryx_refsource_GENTOOMitigationThird Party Advisory
https://usn.ubuntu.com/3705-1/		vendor-advisoryx_refsource_UBUNTUThird Party Advisory
https://www.cve.org/CVERecord?id=CVE-2018-12358
https://www.mozilla.org/en-US/security/advisories/mfsa2018-16/#CVE-2018-12358
https://www.mozilla.org/security/advisories/mfsa2018-15/		x_refsource_CONFIRMVendor Advisory