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CVE-2022-40956

MEDIUM
6.1
CVSS Score
Published: December 22, 2022 at 12:00 AM UTC
Updated: June 17, 2026 at 05:02 AM UTC
3 products affected across 1 vendorFirefoxThunderbirdFirefox ESR

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Severity
MEDIUM6.1
Exploit prediction
EPSS 0.9%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Firefox· Mozilla
95%
v < 105
Affected range stops below 105, so it looks safe — our inference, not a vendor statement
Affected range stops below 105.0, so it looks safe — our inference, not a vendor statement
Firefox ESR· Mozilla
95%
v < 102.3
Affected range stops below 102.3, so it looks safe — our inference, not a vendor statement
Thunderbird· Mozilla
95%
v < 102.3
Affected range stops below 102.3, so it looks safe — our inference, not a vendor statement

References (4)

Issue TrackingPermissions RequiredVendor Advisory
Source: [email protected]
https://bugzilla.mozilla.org/show_bug.cgi?id=1770094
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2022-40/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2022-41/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2022-42/

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.1MEDIUMCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-79

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