On pages containing an iframe, the "data:" protocol can be used to create a modal alert that will render over arbitrary domains following page navigation, spoofing of the origin of the modal alert from the iframe content. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.

No CVSS v4.0

No CVSS v3.1

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction None

Access Vector Network

Access Complexity Low

Authentication None

Confidentiality Impact None

Integrity Impact Partial

Availability Impact None

This CVE is not in the KEV list.

The EPSS score is 0.01355.

Key SSVC decision points have not yet been added.

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 Thunderbird affected
Version Status Constraints
unspecified affected < 52.3
Mozilla Firefox ESR affected
Version Status Constraints
unspecified affected < 52.3
Mozilla Firefox affected
Version Status Constraints
unspecified affected < 55

Configuration 1 [-]

OR cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

Configuration 2 [-]

OR cpe:2.3:o:redhat:enterprise_linux:5.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_desktop:5.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_server:5.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_server_aus:7.3:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_server_aus:7.4:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_server_eus:7.3:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_server_eus:7.4:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_server_eus:7.5:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_workstation:5.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*

Configuration 3 [-]

cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*

Configuration 4 [-]

cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*

Configuration 5 [-]

cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
Package CPE Advisory Released Date
Red Hat Enterprise Linux 6
firefox-0:52.3.0-3.el6_9 cpe:/o:redhat:enterprise_linux:6 RHSA-2017:2456 2017-08-10T00:00:00Z
thunderbird-0:52.3.0-1.el6_9 cpe:/o:redhat:enterprise_linux:6 RHSA-2017:2534 2017-08-24T00:00:00Z
Red Hat Enterprise Linux 7
firefox-0:52.3.0-2.el7_4 cpe:/o:redhat:enterprise_linux:7 RHSA-2017:2456 2017-08-10T00:00:00Z
thunderbird-0:52.3.0-1.el7_4 cpe:/o:redhat:enterprise_linux:7 RHSA-2017:2534 2017-08-24T00:00:00Z

No data.

Project Subscriptions

Vendors Products
Debian Subscribe
Debian Linux Subscribe
Mozilla Subscribe
Firefox Subscribe
Thunderbird Subscribe
Redhat Subscribe
Enterprise Linux Subscribe
Enterprise Linux Desktop Subscribe
Enterprise Linux Server Subscribe
Enterprise Linux Server Aus Subscribe
Enterprise Linux Server Eus Subscribe
Enterprise Linux Workstation Subscribe
Advisories
Source ID Title
Debian DLA Debian DLA DLA-1053-1 firefox-esr security update
Debian DLA Debian DLA DLA-1087-1 icedove/thunderbird security update
Debian DSA Debian DSA DSA-3928-1 firefox-esr security update
Debian DSA Debian DSA DSA-3928-2 firefox-esr security update
Debian DSA Debian DSA DSA-3968-1 icedove/thunderbird security update
EUVD EUVD EUVD-2017-16766 On pages containing an iframe, the "data:" protocol can be used to create a modal alert that will render over arbitrary domains following page navigation, spoofing of the origin of the modal alert from the iframe content. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.
Ubuntu USN Ubuntu USN USN-3391-1 Firefox vulnerabilities
Ubuntu USN Ubuntu USN USN-3416-1 Thunderbird vulnerabilities
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
http://www.securityfocus.com/bid/100240 cve-icon cve-icon
http://www.securitytracker.com/id/1039124 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2017:2456 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2017:2534 cve-icon cve-icon
https://bugzilla.mozilla.org/show_bug.cgi?id=1365875 cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2017-7791 cve-icon
https://security.gentoo.org/glsa/201803-14 cve-icon cve-icon
https://www.cve.org/CVERecord?id=CVE-2017-7791 cve-icon
https://www.debian.org/security/2017/dsa-3928 cve-icon cve-icon
https://www.debian.org/security/2017/dsa-3968 cve-icon cve-icon
https://www.mozilla.org/en-US/security/advisories/mfsa2017-19/#CVE-2017-7791 cve-icon
https://www.mozilla.org/security/advisories/mfsa2017-18/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2017-19/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2017-20/ cve-icon cve-icon
History

Tue, 25 Nov 2025 18:00:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
Vendors & Products Mozilla firefox Esr

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published:

Updated: 2024-08-05T16:12:28.504Z

Reserved: 2017-04-12T00:00:00

Link: CVE-2017-7791

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2018-06-11T21:29:09.407

Modified: 2025-11-25T17:50:16.803

Link: CVE-2017-7791

cve-icon Redhat

Severity : Moderate

Publid Date: 2017-08-08T00:00:00Z

Links: CVE-2017-7791 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses