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Fencer Intel
high 7.5

CVE-2018-5157 json

Same-origin protections for the PDF viewer can be bypassed, allowing a malicious site to intercept messages meant for the viewer.

published 2018-06-11 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-16943

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.6%
EPSS 1.6% chance of exploitation in 30 days, percentile 75%
public exploits
0
none known

Summary

Same-origin protections for the PDF viewer can be bypassed, allowing a malicious site to intercept messages meant for the viewer. This could allow the site to retrieve PDF files restricted to viewing by an authenticated user on a third-party website. This vulnerability affects Firefox ESR < 52.8 and Firefox < 60.

Patch / fix

  • Mozilla Firefox ESR 52.8
  • Mozilla Firefox 60
  • firefox-esr Debian 14, Debian 13, Debian 12 52.8.0esr-1

debian advisories DEBIAN-CVE-2018-5157

  • firefox Ubuntu 14.04 LTS 60.0+build2-0ubuntu0.14.04.1
  • firefox Ubuntu 16.04 LTS 60.0+build2-0ubuntu0.16.04.1
  • firefox Ubuntu 18.04 LTS 60.0+build2-0ubuntu1

ubuntu advisories UBUNTU-CVE-2018-5157

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

  • firefox RHEL 6 52.8.0-1.el6_9
  • firefox RHEL 7 52.8.0-1.el7_5

red hat advisories RHSA-2018:1414RHSA-2018:1415

  • MozillaFirefox SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +17 more 68.2.0-109.95.2
  • MozillaFirefox SLES 12 SP3, SLES 12 SP2-BCL, SLED 12 SP3 +9 more 52.8.0esr-109.31.2
  • MozillaFirefox SLE Module for Desktop Applications 15 52.9.0esr-3.7.12
  • MozillaFirefox SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +3 more 52.8.0esr-72.32.1

suse advisories SUSE-SU-2019:2872-1SUSE-SU-2018:1334-2SUSE-SU-2018:2298-1SUSE-SU-2018:1334-1SUSE-SU-2018:1319-1

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 92.0-1.2

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10600-1

  • firefox Arch Linux 60.0-1

arch linux advisories AVG-693

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-2018-5157 updated cvss 7.5

Mozilla: Same-origin bypass of PDF Viewer to view protected PDF files

  • Red Hat Enterprise Linux Client (v. 7) firefox 52.8.0-1.el7_5 Red Hat Enterprise Linux Client Optional (v. 7) firefox 52.8.0-1.el7_5
    fixed: vendor fix RHSA-2018:1415
  • Red Hat Enterprise Linux Desktop (v. 6) firefox 52.8.0-1.el6_9 Red Hat Enterprise Linux Desktop Optional (v. 6) firefox 52.8.0-1.el6_9
    fixed: vendor fix RHSA-2018:1414
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) firefox 52.8.0-1.el7_5 Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) firefox 52.8.0-1.el7_5
    fixed: vendor fix RHSA-2018:1415
  • Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 52.8.0-1.el6_9 Red Hat Enterprise Linux Server (v. 6) firefox 52.8.0-1.el6_9
    fixed: vendor fix RHSA-2018:1414
  • Red Hat Enterprise Linux Server (v. 7) firefox 52.8.0-1.el7_5
    fixed: vendor fix RHSA-2018:1415
  • Red Hat Enterprise Linux Server Optional (v. 6) firefox 52.8.0-1.el6_9
    fixed: vendor fix RHSA-2018:1414
  • Red Hat Enterprise Linux Server Optional (v. 7) firefox 52.8.0-1.el7_5
    fixed: vendor fix RHSA-2018:1415
  • Red Hat Enterprise Linux Workstation (v. 6) firefox 52.8.0-1.el6_9
    fixed: vendor fix RHSA-2018:1414
show 4 more
  • Red Hat Enterprise Linux Workstation (v. 7) firefox 52.8.0-1.el7_5
    fixed: vendor fix RHSA-2018:1415
  • Red Hat Enterprise Linux Workstation Optional (v. 6) firefox 52.8.0-1.el6_9
    fixed: vendor fix RHSA-2018:1414
  • Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 52.8.0-1.el7_5
    fixed: vendor fix RHSA-2018:1415
  • Red Hat Enterprise Linux 6 thunderbird Red Hat Enterprise Linux 7 thunderbird Red Hat Enterprise Linux 8 firefox
    not affected: vulnerable code not present

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

1.58% chance of exploitation in the next 30 days, higher than 75% of all scored CVEs (FIRST EPSS, 2026-11-09).

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 Firefox ESR
  • Mozilla Firefox

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-346 Origin Validation Error

References

Sources

Fencer Intel 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.