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No exploitation reportedFix available

CVE-2017-7787

No exploitation reported by the sources we read.

  • Published2018-06-11
  • WeaknessCWE-200

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2018-06-1121:29CVE publishedNVD

Versions per branch

NVD
Redhat enterprise linux
BranchAffectedFixed in
5.0= 5.0no fix published
6.0= 6.0no fix published
7.0= 7.0no fix published
Redhat enterprise linux desktop
BranchAffectedFixed in
5.0= 5.0no fix published
6.0= 6.0no fix published
7.0= 7.0no fix published
Redhat enterprise linux server
BranchAffectedFixed in
5.0= 5.0no fix published
6.0= 6.0no fix published
7.0= 7.0no fix published

7 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • firefoxUbuntu:16.04:LTSall versions · fixed in 55.0.1+build2-0ubuntu0.16.04.2
  • firefoxUbuntu:14.04:LTSall versions · fixed in 55.0.1+build2-0ubuntu0.14.04.2
  • firefoxRed Hat:enterprise_linux:7::workstationall versions · fixed in 0:52.3.0-2.el7_4and 1 other package
  • firefoxRed Hat:enterprise_linux:7::serverall versions · fixed in 0:52.3.0-2.el7_4and 1 other package
  • firefoxRed Hat:enterprise_linux:7::clientall versions · fixed in 0:52.3.0-2.el7_4and 1 other package
  • firefoxRed Hat:enterprise_linux:6::workstationall versions · fixed in 0:52.3.0-3.el6_9and 1 other package
  • firefoxRed Hat:enterprise_linux:6::serverall versions · fixed in 0:52.3.0-3.el6_9and 1 other package
  • firefoxRed Hat:enterprise_linux:6::computenodeall versions · fixed in 0:52.3.0-3.el6_9and 1 other package

57 more package ranges on OSV.dev

Vendor advisories

  • CVE-2017-7787 Red Hat Product Security229 products fixed

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

  • RHSA-2017:2534 Red Hat Product Security32 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2017:2456 Red Hat Product Security59 products fixed

    Red Hat Security Advisory: firefox security update

Full record on NVD

Fix

  1. Vendor fix Red Hat Product Security RHSA-2017:2534 · 32 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
  2. Vendor fix Red Hat Product Security RHSA-2017:2456 · 59 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing the update, Firefox must be restarted for the changes to take effect.

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
2018-06-11
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-6g35-2rw4-ch3p

Frequently asked questions

What is CVE-2017-7787?

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.

Is CVE-2017-7787 actively exploited?

Active exploitation of CVE-2017-7787 has not been confirmed. Its EPSS score was 2.3% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2017-7787?

CVE-2017-7787 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

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Sources for this record