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Fencer Vulns
high 7.5

CVE-2017-7787 json

Same-origin policy protections can be bypassed on pages with embedded iframes during page reloads, allowing the iframes to access content o…

published 2018-06-11 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-16762

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.3%
EPSS 2.3% chance of exploitation in 30 days, percentile 83%
public exploits
0
none known

Summary

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.

Patch / fix

  • Mozilla Thunderbird 52.3
  • Mozilla Firefox ESR 52.3
  • Mozilla Firefox 55
  • firefox-esr Debian 14, Debian 13, Debian 12 52.3.0esr-1

debian advisories DEBIAN-CVE-2017-7787

  • firefox Ubuntu 14.04 LTS 55.0.1+build2-0ubuntu0.14.04.2
  • firefox Ubuntu 16.04 LTS 55.0.1+build2-0ubuntu0.16.04.2
  • thunderbird Ubuntu 14.04 LTS 1:52.3.0+build1-0ubuntu0.14.04.1
  • thunderbird Ubuntu 16.04 LTS 1:52.3.0+build1-0ubuntu0.16.04.1
  • thunderbird Ubuntu 18.04 LTS 1:52.4.0+build1-0ubuntu2

ubuntu advisories UBUNTU-CVE-2017-7787

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • thunderbird RHEL 6 52.3.0-1.el6_9
  • thunderbird RHEL 7 52.3.0-1.el7_4
  • firefox RHEL 6 52.3.0-3.el6_9
  • firefox RHEL 7 52.3.0-2.el7_4

red hat advisories RHSA-2017:2534RHSA-2017:2456

  • MozillaFirefox SLES for SAP 12 SP3, SLES for SAP 12 SP2, SLES for SAP 12 SP1 +10 more 52.3.0esr-109.3.1
  • MozillaFirefox SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +3 more 52.3.0esr-72.9.1
  • MozillaFirefox-branding-SLED SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +2 more 52-24.5.1

suse advisories SUSE-SU-2017:2589-1SUSE-SU-2017:2302-1

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 92.0-1.2
  • MozillaThunderbird openSUSE Tumbleweed 91.1.1-1.1
  • MozillaThunderbird Package Hub 12 52.3.0-42.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10600-1openSUSE-SU-2024:10601-1openSUSE-SU-2017:2209-1

  • firefox Arch Linux 55.0-1
  • thunderbird Arch Linux 52.3.0-1

arch linux advisories AVG-375AVG-385

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2017-7787 updated cvss 7.5

Mozilla: Same-origin policy bypass with iframes through page reloads (MFSA 2017-19)

  • Red Hat Enterprise Linux Client (v. 7) firefox 52.3.0-2.el7_4, thunderbird 52.3.0-1.el7_4 Red Hat Enterprise Linux Client Optional (v. 7) firefox 52.3.0-2.el7_4 Red Hat Enterprise Linux Desktop (v. 6) firefox 52.3.0-3.el6_9, thunderbird 52.3.0-1.el6_9 Red Hat Enterprise Linux Desktop Optional (v. 6) firefox 52.3.0-3.el6_9 Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 52.3.0-3.el6_9 Red Hat Enterprise Linux Server (v. 6) firefox 52.3.0-3.el6_9
    +7 more products
    Red Hat Enterprise Linux Server (v. 7) firefox 52.3.0-2.el7_4 Red Hat Enterprise Linux Server Optional (v. 6) firefox 52.3.0-3.el6_9, thunderbird 52.3.0-1.el6_9 Red Hat Enterprise Linux Server Optional (v. 7) firefox 52.3.0-2.el7_4, thunderbird 52.3.0-1.el7_4 Red Hat Enterprise Linux Workstation (v. 6) firefox 52.3.0-3.el6_9, thunderbird 52.3.0-1.el6_9 Red Hat Enterprise Linux Workstation (v. 7) firefox 52.3.0-2.el7_4, thunderbird 52.3.0-1.el7_4 Red Hat Enterprise Linux Workstation Optional (v. 6) firefox 52.3.0-3.el6_9 Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 52.3.0-2.el7_4
    fixed: vendor fix RHSA-2017:2456

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.30% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=1322896 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

  • Mozilla Thunderbird
  • Mozilla Firefox ESR
  • Mozilla Firefox

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.