CVE-2023-4580

Push notifications saved to disk unencrypted

6.5MediumCVSS base score
0.42%Exploitation in 30 daysEPSS · top 63% of all CVEs
NoKnown exploitednot in CISA's KEV catalog
NonePublic exploitsnone known yet

Description

Push notifications stored on disk in private browsing mode were not being encrypted potentially allowing the leak of sensitive information. This vulnerability affects Firefox < 117, Firefox ESR < 115.2, and Thunderbird < 115.2.

Timeline

2023
29 Aug 2023
29 Aug 2023
ID reserved
By mozilla
11 Sept 202313 days later
11 Sept 2023· 13 days later
Published
2025
18 Dec 20252 years later
18 Dec 2025· 2 years later
Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2023-4580, by who scored it
Scored by	CVSS	Score	Vector
NVDNVD · Modified	3.1	Medium6.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

EPSS (exploitation in 30 days): 0.42% · top 63% of all CVEs (10 Nov 2026)
CISA SSVC: Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.5.

Affected products

Mozilla · Firefox
- affected unspecified – < 117
Mozilla · Firefox ESR
- affected unspecified – < 115.2
Mozilla · Thunderbird
- affected unspecified – < 115.2

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1843046 (opens in a new tab)x_transferred
https://www.mozilla.org/security/advisories/mfsa2023-34/ (opens in a new tab)x_transferred
https://www.mozilla.org/security/advisories/mfsa2023-36/ (opens in a new tab)x_transferred
https://www.mozilla.org/security/advisories/mfsa2023-38/ (opens in a new tab)x_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

[![CVE-2023-4580](https://cveledger.app/badge/CVE-2023-4580.svg)](https://cveledger.app/cve/CVE-2023-4580)

Record last updated 18 Dec 2025, 15:23 UTC.