An attacker with temporary script access to a site could have set a cookie containing invalid characters using `document.cookie` that could…

published 2023-10-24 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-58009

cvss: 5.3; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.7%; EPSS 0.7% chance of exploitation in 30 days, percentile 53%
public exploits: 0; none known

An attacker with temporary script access to a site could have set a cookie containing invalid characters using `document.cookie` that could have led to unknown errors. This vulnerability affects Firefox < 119.

Patch / fix

fixed in 1 distros 4

Mozilla Firefox 119

ubuntu suse opensuse alpine

firefox Ubuntu 20.04 LTS 119.0+build2-0ubuntu0.20.04.1

ubuntu advisories UBUNTU-CVE-2023-5723

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

MozillaFirefox SLES for SAP 15 SP3, SLES for SAP 15 SP2, SLES 15 SP3-LTSS +9 more 115.4.0-150200.152.114.1
MozillaFirefox SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 115.4.0-112.188.1
MozillaFirefox SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLE High Performance Computing 15 SP1-LTSS 115.4.0-150000.150.113.1

suse advisories SUSE-SU-2023:4214-1 SUSE-SU-2023:4213-1 SUSE-SU-2023:4212-1

firefox-esr openSUSE Tumbleweed 128.5.1-1.1
MozillaFirefox openSUSE Tumbleweed 119.0-1.1

opensuse advisories openSUSE-SU-2024:14572-1 openSUSE-SU-2024:13385-1

firefox Alpine 3.23, Alpine 3.22, Alpine 3.21 +3 more 119.0-r0
librewolf Alpine 3.24, Alpine 3.23, Alpine 3.22 119.0-r0

alpine advisories ALPINE-CVE-2023-5723

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Exploit prediction

0.70% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected products

Mozilla Firefox

References

mozilla.org /security/advisories/mfsa2023-45/
vendor-advisory
bugzilla.mozilla.org /show_bug.cgi?id=1802057
issue-tracking
security.gentoo.org /glsa/202401-10

Sources

CVE List CVE-2023-5723
NVD CVE-2023-5723

Fencer Vulns 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.

Summary