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Fencer Intel
high 8.8

CVE-2017-7846 json

It is possible to execute JavaScript in the parsed RSS feed when RSS feed is viewed as a website, e.g.

published 2018-06-11 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-16821

cvss
8.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.9%
EPSS 1.9% chance of exploitation in 30 days, percentile 80%
public exploits
0
none known

Summary

It is possible to execute JavaScript in the parsed RSS feed when RSS feed is viewed as a website, e.g. via "View -> Feed article -> Website" or in the standard format of "View -> Feed article -> default format". This vulnerability affects Thunderbird < 52.5.2.

Patch / fix

  • Mozilla Thunderbird 52.5.2
  • thunderbird Debian 14, Debian 13, Debian 12 1:52.5.2-1

debian advisories DEBIAN-CVE-2017-7846

  • thunderbird Ubuntu 14.04 LTS 1:52.6.0+build1-0ubuntu0.14.04.1
  • thunderbird Ubuntu 16.04 LTS 1:52.6.0+build1-0ubuntu0.16.04.1

ubuntu advisories UBUNTU-CVE-2017-7846

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 52.5.2-1.el6_9
  • thunderbird RHEL 7 52.5.2-1.el7_4

red hat advisories RHSA-2018:0061

  • MozillaThunderbird openSUSE Tumbleweed 91.1.1-1.1
  • MozillaThunderbird Package Hub 12 52.5.2-51.1

opensuse advisories openSUSE-SU-2024:10601-1openSUSE-SU-2017:3433-1openSUSE-SU-2017:3434-1

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-2017-7846 updated cvss 8.8

Mozilla: JavaScript Execution via RSS in mailbox:// origin

  • Red Hat Enterprise Linux Client (v. 7) thunderbird 52.5.2-1.el7_4 Red Hat Enterprise Linux Desktop (v. 6) thunderbird 52.5.2-1.el6_9 Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) thunderbird 52.5.2-1.el7_4 Red Hat Enterprise Linux Server Optional (v. 6) thunderbird 52.5.2-1.el6_9 Red Hat Enterprise Linux Server Optional (v. 7) thunderbird 52.5.2-1.el7_4 Red Hat Enterprise Linux Workstation (v. 6) thunderbird 52.5.2-1.el6_9
    +1 more products
    Red Hat Enterprise Linux Workstation (v. 7) thunderbird 52.5.2-1.el7_4
    fixed: vendor fix RHSA-2018:0061

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

1.94% chance of exploitation in the next 30 days, higher than 80% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 8.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

  • Mozilla Thunderbird

Classification

Weakness
  • CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component

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.