CVE-2017-7787

Name: CVE-2017-7787
Creator: NVD / NIST
Published: 2018-06-11T21:29:09.233+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 2.38%

Last modified Jun 17, 2026

CVE-2017-7787 is a vulnerability of currently unknown severity. Same-origin policy protections can be bypassed on pages with embedded iframes during page reloads, allowing the iframes to access content on the top level page, leading to information disclosure. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.. EPSS estimates a 2.38% chance of exploitation in the next 30 days.

Description

Same-origin policy protections can be bypassed on pages with embedded iframes during page reloads, allowing the iframes to access content on the top level page, leading to information disclosure. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.

Metrics

EPSS Probability

2.38%

81.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-200

Affected Software

Vendor	Product	Versions
Debian	Debian Linux	8.0
Debian	Debian Linux	9.0
Redhat	Enterprise Linux	5.0
Redhat	Enterprise Linux	6.0
Redhat	Enterprise Linux	7.0
Redhat	Enterprise Linux Desktop	5.0
Redhat	Enterprise Linux Desktop	6.0
Redhat	Enterprise Linux Desktop	7.0
Redhat	Enterprise Linux Server	5.0
Redhat	Enterprise Linux Server	6.0
Redhat	Enterprise Linux Server	7.0
Redhat	Enterprise Linux Server Aus	7.3
Redhat	Enterprise Linux Server Aus	7.4
Redhat	Enterprise Linux Server Eus	7.3
Redhat	Enterprise Linux Server Eus	7.4
Redhat	Enterprise Linux Server Eus	7.5
Redhat	Enterprise Linux Workstation	5.0
Redhat	Enterprise Linux Workstation	6.0
Redhat	Enterprise Linux Workstation	7.0
Mozilla	Thunderbird	< 52.3
Mozilla	Firefox	< 55.0
Mozilla	Firefox Esr	< 52.3

References

http://www.securityfocus.com/bid/100234Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1039124Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2017:2456Third Party Advisory
https://access.redhat.com/errata/RHSA-2017:2534Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1322896Exploit, Issue Tracking, Vendor Advisory
https://security.gentoo.org/glsa/201803-14Third Party Advisory
https://www.debian.org/security/2017/dsa-3928Third Party Advisory
https://www.debian.org/security/2017/dsa-3968Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2017-18/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-19/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-20/Vendor Advisory
http://www.securityfocus.com/bid/100234Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1039124Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2017:2456Third Party Advisory
https://access.redhat.com/errata/RHSA-2017:2534Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1322896Exploit, Issue Tracking, Vendor Advisory
https://security.gentoo.org/glsa/201803-14Third Party Advisory
https://www.debian.org/security/2017/dsa-3928Third Party Advisory
https://www.debian.org/security/2017/dsa-3968Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2017-18/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-19/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-20/Vendor Advisory

Timeline

Published: Jun 11, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-7787?

How severe is CVE-2017-7787?

Severity scoring for CVE-2017-7787 is pending analysis. The EPSS model estimates a 2.38% probability of exploitation in the next 30 days.

How do I fix CVE-2017-7787?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-7787?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST