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CVE-2023-4581
XLL file extensions were downloadable without warnings
Medium4.3EPSS 0.57%
- Published
- Updated
- Reserved
- Assigned by
- mozilla
Description
Excel `.xll` add-in files did not have a blocklist entry in Firefox's executable blocklist which allowed them to be downloaded without any warning of their potential harm. This vulnerability affects Firefox < 117, Firefox ESR < 102.15, Firefox ESR < 115.2, Thunderbird < 102.15, and Thunderbird < 115.2.
Timeline
ID reserved
By mozilla
- 13 days later
· 13 days later
Published
- 2 years later
· 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
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium4.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N |
- EPSS (exploitation in 30 days)
- 0.57% · top 52% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.3.
Affected products
- affected unspecified – < 117
- affected unspecified – < 102.15
- affected unspecified – < 115.2
- affected unspecified – < 102.15
- affected unspecified – < 115.2
References (6)
- https://bugzilla.mozilla.org/show_bug.cgi?id=1843758 (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/mfsa2023-35/ (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/mfsa2023-37/ (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.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2023-4581)Record last updated .