Information disclosure, mitigation bypass in the Settings UI component (Mozilla Firefox)

CVE-2026-2803

HIGH 7.5

At a glance

Source: NVD
EPSS: EPSS 0.29 % · percentile 22 (2026-10-31)
State: PUBLISHED
Published: 2026-02-24 13:33 UTC
Updated: 2026-04-13 13:54 UTC
Assigner: mozilla
NVD status: Modified

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Description

Information disclosure, mitigation bypass in the Settings UI component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.

Weaknesses (CWE)

CWE-200 — Exposure of Sensitive Information to an Unauthorized Actor
CWE-693 — Protection Mechanism Failure

References

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:H/I:N/A:N	CISA-ADP
CVSS 3.1	HIGH 7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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:H/I:N/A:N	NVD · 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

European references

ENISA EUVD · EUVD-2026-8456
GCVE · GCVE-0-2026-2803

CERT-FR advisories

CERTFR-2026-AVI-0204 — Multiples vulnérabilités dans les produits Mozilla · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* < 148.0
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:* < 148.0

Affected products

Product	Versions
Mozilla · Firefox	unaffected 148 ≤ *
Mozilla · Thunderbird	unaffected 148 ≤ *

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