When injecting an HTML base element, some requests would ignore the CSP's base-uri settings and accept the injected element's base instead. This vulnerability affects Firefox ESR < 102.3, Thunderbird < 102.3, and Firefox < 105.
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Score 6.1 from GitHub Security Advisory published 2022-12-22. NVD baseline CVSS 6.1; sources differ by 0.0.
A fix is available — apply it.
When injecting an HTML base element, some requests would ignore the CSP's base-uri settings and accept the injected element's base instead. This vulnerability affects Firefox ESR < 102.3, Thunderbird < 102.3, and Firefox < 105.
December 22, 2022
April 15, 2025
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| ubuntu | firefox-locale-ast (105.0+build2-0ubuntu0.20.04.1) @ focal | 2026-05-25 | ubuntu |
| ubuntu | thunderbird-locale-id (1:102.4.2+build2-0ubuntu0.22.10.1) @ kinetic | 2026-05-25 | ubuntu |
| redhat | firefox-0:102.3.0-6.el8_2 | 2022-09-26 | redhat |
| redhat | thunderbird-0:102.3.0-3.el8_2 | 2022-09-26 | redhat |
| redhat | thunderbird-0:102.3.0-3.el9_0 | 2022-09-26 | redhat |
| redhat | firefox-0:102.3.0-6.el8_1 | 2022-09-26 | redhat |
| redhat | thunderbird-0:102.3.0-3.el8_4 | 2022-09-26 | redhat |
| redhat | firefox-0:102.3.0-6.el7_9 | 2022-09-26 | redhat |
| redhat | thunderbird-0:102.3.0-3.el8_1 | 2022-09-26 | redhat |
| redhat | firefox-0:102.3.0-6.el8_6 | 2022-09-26 | redhat |
| redhat | firefox-0:102.3.0-6.el9_0 | 2022-09-26 | redhat |
| redhat | firefox-0:102.3.0-6.el8_4 | 2022-09-26 | redhat |
| redhat | thunderbird-0:102.3.0-3.el7_9 | 2022-09-26 | redhat |
| redhat | thunderbird-0:102.3.0-3.el8_6 | 2022-09-26 | redhat |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.
RHSA-2022:6700 — Low
RHSA-2022:6701 — Low
RHSA-2022:6702 — Low
RHSA-2022:6703 — Low
RHSA-2022:6707 — Low
RHSA-2022:6708 — Low
RHSA-2022:6710 — Low
RHSA-2022:6711 — Low
RHSA-2022:6713 — Low
RHSA-2022:6715 — Low
RHSA-2022:6716 — Low
RHSA-2022:6717 — Low
Firefox vulnerabilities
Thunderbird vulnerabilities
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
Explore the affected products and dependency analysis for CVE-2022-40956
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