CVE-2017-7788 — Mozilla: Sandboxed about:srcdoc frames do not inherit CSP directives (MFSA 2017-18)

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CRITICAL

Mozilla: Sandboxed about:srcdoc frames do not inherit CSP directives (MFSA 2017-18)

Published Jun 11, 2018

9.8

CRITICAL

CVSS 3.0

EPSS 2.31%

Description

When an "iframe" has a "sandbox" attribute and its content is specified using "srcdoc", that content does not inherit the containing page's Content Security Policy (CSP) as it should unless the sandbox attribute included "allow-same-origin". This vulnerability affects Firefox < 55.

Affected products

Vendor Mozilla Product Firefox Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <55

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	<55

Red Hat Enterprise Linux 6

firefox

Not affected
Red Hat Enterprise Linux 7

firefox

Not affected

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

Remediation

No remediation recorded yet.

Metrics

2.31% 0.02306

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

EPSS probability 0.02306

Score over time

2021–2026

EPSS v1
EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v1
EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (19 key points)

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

Date	Score	Percentile	Model
Oct 1, 2026	2.31% (0.02306)	82.72th	v5 (v2026.06.15)
Jun 15, 2026	2.34% (0.02336)	81.30th	v5 (v2026.06.15)
Sep 8, 2025	2.02% (0.02019)	83.05th	v4 (v2025.03.14)
Mar 30, 2025	3.39% (0.03389)	86.27th	v4 (v2025.03.14)
Mar 29, 2025	9.46% (0.09462)	87.92th	v4 (v2025.03.14)
Mar 17, 2025	3.45% (0.03453)	86.72th	v4 (v2025.03.14)
Jul 20, 2024	0.51% (0.00514)	76.87th	v3 (v2023.03.01)
Feb 29, 2024	0.51% (0.00514)	76.09th	v3 (v2023.03.01)
Nov 2, 2023	0.51% (0.00514)	74.07th	v3 (v2023.03.01)
Jun 5, 2023	0.54% (0.00541)	74.04th	v3 (v2023.03.01)
Mar 7, 2023	0.65% (0.00645)	76.09th	v3 (v2023.03.01)
Mar 6, 2023	1.02% (0.01018)	40.69th	v2 (v2022.01.01)
Sep 10, 2022	1.02% (0.01018)	38.88th	v2 (v2022.01.01)
Apr 1, 2022	1.02% (0.01018)	36.86th	v2 (v2022.01.01)
Feb 4, 2022	1.02% (0.01018)	19.50th	v2 (v2022.01.01)
Feb 3, 2022	1.04% (0.01040)	28.32th	v1
Jan 6, 2022	1.04% (0.01040)	27.69th	v1
Sep 1, 2021	1.04% (0.01040)	64.49th	v1
Apr 14, 2021	1.04% (0.01040)	0.00th	v1

Weaknesses (2)

CWE-74

CWE-863

Incorrect Authorization

References (9)

http://www.securityfocus.com/bid/100379
vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1039124
vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
https://access.redhat.com/security/cve/CVE-2017-7788
Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1073952
x_refsource_CONFIRMExploitIssue TrackingVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1479207
Issue Tracking
https://nvd.nist.gov/vuln/detail/CVE-2017-7788
https://www.cve.org/CVERecord?id=CVE-2017-7788
https://www.mozilla.org/en-US/security/advisories/mfsa2017-18/#CVE-2017-7788
https://www.mozilla.org/security/advisories/mfsa2017-18/
x_refsource_CONFIRMVendor Advisory

Link	Providers	Tags
http://www.securityfocus.com/bid/100379		vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1039124		vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
https://access.redhat.com/security/cve/CVE-2017-7788		Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1073952		x_refsource_CONFIRMExploitIssue TrackingVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1479207		Issue Tracking
https://nvd.nist.gov/vuln/detail/CVE-2017-7788
https://www.cve.org/CVERecord?id=CVE-2017-7788
https://www.mozilla.org/en-US/security/advisories/mfsa2017-18/#CVE-2017-7788
https://www.mozilla.org/security/advisories/mfsa2017-18/		x_refsource_CONFIRMVendor Advisory