CVE-2018-5168

critical
Published — · Modified —
CVSS v3
CVSS v2
VIR risk
9.5

Description

Sites can bypass security checks on permissions to install lightweight themes by manipulating the "baseURI" property of the theme element. This could allow a malicious site to install a theme without user interaction which could contain offensive or embarrassing images. This vulnerability affects Thunderbird < 52.8, Thunderbird ESR < 52.8, Firefox < 60, and Firefox ESR < 52.8.

Predictions

Exploit likelihood
20%
Patch ETA

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2018-5168

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-201805-10

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-201805-21

OS impact

OSVersionStatusFixed in
arch archfixed52.8.0-1
debian debiansidfixed60.0-1
debian debianbookwormfixed52.8.0esr-1
debian debianbullseyefixed52.8.0esr-1
debian debianforkyfixed52.8.0esr-1
debian debiantrixiefixed52.8.0esr-1

References

Verify integrity in audit chain (admin only). AS-IS.