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Fencer Intel
medium 6.5

CVE-2020-15648 json

Using object or embed tags, it was possible to frame other websites, even if they disallowed framing using the X-Frame-Options header.

published 6y ago modified 4mo ago also EUVD-2020-7635

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.1%
EPSS 1.1% chance of exploitation in 30 days, percentile 66%
public exploits
0
none known

Summary

Using object or embed tags, it was possible to frame other websites, even if they disallowed framing using the X-Frame-Options header. This vulnerability affects Thunderbird < 78 and Firefox < 78.0.2.

Patch / fix

  • Mozilla Thunderbird 78
  • Mozilla Firefox 78.0.2
  • firefox Ubuntu 16.04 LTS 79.0+build1-0ubuntu0.16.04.2
  • firefox Ubuntu 18.04 LTS 79.0+build1-0ubuntu0.18.04.1
  • firefox Ubuntu 20.04 LTS 79.0+build1-0ubuntu0.20.04.1
  • thunderbird Ubuntu 18.04 LTS 1:78.8.1+build1-0ubuntu0.18.04.1
  • thunderbird Ubuntu 20.04 LTS 1:78.7.1+build1-0ubuntu0.20.04.1

ubuntu advisories UBUNTU-CVE-2020-15648

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 7 78.3.0-1.el7_9
  • firefox RHEL 8 78.2.0-2.el8_2
  • firefox RHEL 8.0 E4S 78.2.0-3.el8_0
  • firefox RHEL 8.1 EUS 78.2.0-3.el8_1

red hat advisories RHSA-2020:4080RHSA-2020:3555RHSA-2020:3559RHSA-2020:3557

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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-2020-15648 updated cvss 6.5

Mozilla: X-Frame-Options bypass using object or embed tags

  • Red Hat Enterprise Linux 5 firefox Red Hat Enterprise Linux 6 firefox
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) firefox 78.2.0-2.el8_2
    fixed: vendor fix RHSA-2020:3557
  • Red Hat Enterprise Linux AppStream E4S (v. 8.0) firefox 78.2.0-3.el8_0
    fixed: vendor fix RHSA-2020:3555
  • Red Hat Enterprise Linux AppStream EUS (v. 8.1) firefox 78.2.0-3.el8_1
    fixed: vendor fix RHSA-2020:3559
  • Red Hat Enterprise Linux Client (v. 7) firefox 78.3.0-1.el7_9 Red Hat Enterprise Linux Client Optional (v. 7) firefox 78.3.0-1.el7_9 Red Hat Enterprise Linux Server (v. 7) firefox 78.3.0-1.el7_9 Red Hat Enterprise Linux Server Optional (v. 7) firefox 78.3.0-1.el7_9 Red Hat Enterprise Linux Workstation (v. 7) firefox 78.3.0-1.el7_9 Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 78.3.0-1.el7_9
    fixed: vendor fix RHSA-2020:4080

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

1.14% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Affected products

  • Mozilla Thunderbird
  • Mozilla Firefox

Classification

Weakness
  • CWE-1021 Improper Restriction of Rendered UI Layers or Frames

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.