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CVE-2022-26387

HIGH
7.5
CVSS Score
Published: December 22, 2022 at 12:00 AM UTC
Updated: June 17, 2026 at 04:35 AM UTC
3 products affected across 1 vendorFirefoxThunderbirdFirefox ESR

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Severity
HIGH7.5
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

Description

When installing an add-on, Firefox verified the signature before prompting the user; but while the user was confirming the prompt, the underlying add-on file could have been modified and Firefox would not have noticed. This vulnerability affects Firefox < 98, Firefox ESR < 91.7, and Thunderbird < 91.7.

Affected

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

Firefox· Mozilla
95%
v < 98
Affected range stops below 98, so it looks safe — our inference, not a vendor statement
Affected range stops below 98.0, so it looks safe — our inference, not a vendor statement
Firefox ESR· Mozilla
95%
v < 91.7
Affected range stops below 91.7, so it looks safe — our inference, not a vendor statement
Thunderbird· Mozilla
95%
v < 91.7
Affected range stops below 91.7, so it looks safe — our inference, not a vendor statement

References (4)

ExploitIssue TrackingVendor Advisory
Source: [email protected]
https://bugzilla.mozilla.org/show_bug.cgi?id=1752979
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2022-10/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2022-11/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2022-12/

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

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

CVSS

7.5HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-367

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