CVE-2023-4583

Browsing Context potentially not cleared when closing Private Window

At a glance

Severity: HIGH 7.5
EPSS: EPSS 0.69 % · percentile 52 (2026-10-27)
State: PUBLISHED
Published: 2023-09-11
Updated: 2025-12-18
Assigner: mozilla
NVD status: Modified

Description

When checking if the Browsing Context had been discarded in `HttpBaseChannel`, if the load group was not available then it was assumed to have already been discarded which was not always the case for private channels after the private session had ended. This vulnerability affects Firefox < 117, Firefox ESR < 115.2, and Thunderbird < 115.2.

Scores

Version	Score	Vector	Scored by
CVSS 3.1	HIGH 7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N	CISA-ADP
CVSS 3.1	HIGH 7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N	NVD · nvd@nist.gov (Primary)
CVSS 3.1	HIGH 7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N	NVD · 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

Weaknesses (CWE)

CWE-754

European references

ENISA EUVD · EUVD-2023-54437
GCVE · GCVE-0-2023-4583

CERT-FR advisories

CERTFR-2023-AVI-0703 — Multiples vulnérabilités dans Thunderbird · cert.ssi.gouv.fr
CERTFR-2023-AVI-0695 — Multiples vulnérabilités dans les produits Mozilla · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* < 117.0
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* < 115.2
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* < 115.2

Affected products

Product	Versions
Mozilla · Firefox	affected unspecified < 117
Mozilla · Firefox ESR	affected unspecified < 115.2
Mozilla · Thunderbird	affected unspecified < 115.2

References

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD