CVE-2022-40956 — Cross-site Scripting in Mozilla Firefox

CWE-79 — Cross-site ScriptingCWE-1021 — UI Misrepresentation / Clickjacking13 documents9 sources
Severity
6.1MEDIUMNVD
OSV5.5
EPSS
0.2%
top 52.58%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
Mozilla FirefoxMozilla Firefox ESRMozilla Thunderbird
Timeline
PublishedDec 22
Latest updateSep 22

Description

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NExploitability: 2.8 | Impact: 2.7

Affected Packages8 packages

▶CVEListV5mozilla/firefoxunspecified — 105
▶NVDmozilla/firefox< 105.0
▶CVEListV5mozilla/firefox_esrunspecified — 102.3
▶NVDmozilla/firefox_esr< 102.3
▶CVEListV5mozilla/thunderbirdunspecified — 102.3

🔴Vulnerability Details

4
OSV
CVE-2022-40956: When injecting an HTML base element, some requests would ignore the CSP's base-uri settings and accept the injected element's base instead↗2022-12-22
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GHSA
GHSA-74v3-gjvq-vv7f: When injecting an HTML base element, some requests would ignore the CSP's base-uri settings and accept the injected element's base instead↗2022-12-22
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CVEList
CVE-2022-40956: When injecting an HTML base element, some requests would ignore the CSP's base-uri settings and accept the injected element's base instead↗2022-12-22
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OSV
thunderbird vulnerabilities↗2022-11-11
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📋Vendor Advisories

7
Ubuntu
Thunderbird vulnerabilities↗2022-11-11
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Ubuntu
Firefox vulnerabilities↗2022-09-30
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Red Hat
Mozilla: Content-Security-Policy base-uri bypass↗2022-09-20
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Debian
CVE-2022-40956: firefox - When injecting an HTML base element, some requests would ignore the CSP's base-u...↗2022
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Mozilla
Mozilla Foundation Security Advisory 2022-40: CVE-2022-40956↗
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💬Community

1
Bugzilla
CSP bypass in DevTools Network Tab Response Preview because `content-security-policy:` headers ignored↗2024-09-22
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CVE-2022-40956 — Cross-site Scripting in Mozilla | cvebase