- 5.4MediumCVSS base score
- 0.17%Exploitation in 30 daysEPSS · top 93% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
Timeline
ID reserved
By mozilla
Published
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 |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | Medium5.4 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N |
| NVDNVD · Analyzed | 3.1 | Medium5.4 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N |
- EPSS (exploitation in 30 days)
- 0.17% · top 93% of all CVEs (11 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 5.4.
Affected products
- unaffected 140.15 – ≤ 140.*
- unaffected 153.2 – ≤ 153.*
- unaffected 155 – ≤ *
- unaffected 140.15 – ≤ 140.*
- unaffected 153.2 – ≤ 153.*
- unaffected 155 – ≤ *
References
References7
- https://bugzilla.mozilla.org/show_bug.cgi?id=2061110 (opens in a new tab)
- https://www.mozilla.org/security/advisories/mfsa2026-82/ (opens in a new tab)
- https://www.mozilla.org/security/advisories/mfsa2026-84/ (opens in a new tab)
- https://www.mozilla.org/security/advisories/mfsa2026-85/ (opens in a new tab)
- https://www.mozilla.org/security/advisories/mfsa2026-86/ (opens in a new tab)
- https://www.mozilla.org/security/advisories/mfsa2026-87/ (opens in a new tab)
- https://www.mozilla.org/security/advisories/mfsa2026-88/ (opens in a new tab)
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)
- EUVD EUVD-2026-69073 (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://cveledger.app/cve/CVE-2026-84124)Record last updated .