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Vulnerability details: VCID-ser1-rz5u-gybn
Vulnerability ID VCID-ser1-rz5u-gybn
Aliases CVE-2022-34478
Summary The ms-msdt, search, and search-ms protocols deliver content to Microsoft applications, bypassing the browser, when a user accepts a prompt. These applications have had known vulnerabilities, exploited in the wild (although we know of none exploited through Firefox), so in this release Firefox has blocked these protocols from prompting the user to open them.*This bug only affects Firefox on Windows. Other operating systems are unaffected.*
Status Published
Exploitability None
Weighted Severity None
Risk None
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-356 Product UI does not Warn User of Unsafe Actions
System Score Found at
cvssv3 6.1 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2022-34478.json
epss 0.00148 https://api.first.org/data/v1/epss?cve=CVE-2022-34478
cvssv3.1 6.5 https://bugzilla.mozilla.org/show_bug.cgi?id=1773717
ssvc Track https://bugzilla.mozilla.org/show_bug.cgi?id=1773717
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2022-24
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2022-25
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2022-26
cvssv3.1 6.5 https://www.mozilla.org/security/advisories/mfsa2022-24/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2022-24/
cvssv3.1 6.5 https://www.mozilla.org/security/advisories/mfsa2022-25/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2022-25/
cvssv3.1 6.5 https://www.mozilla.org/security/advisories/mfsa2022-26/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2022-26/
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2022-34478.json
https://api.first.org/data/v1/epss?cve=CVE-2022-34478
2102167 https://bugzilla.redhat.com/show_bug.cgi?id=2102167
mfsa2022-24 https://www.mozilla.org/en-US/security/advisories/mfsa2022-24
mfsa2022-24 https://www.mozilla.org/security/advisories/mfsa2022-24/
mfsa2022-25 https://www.mozilla.org/en-US/security/advisories/mfsa2022-25
mfsa2022-25 https://www.mozilla.org/security/advisories/mfsa2022-25/
mfsa2022-26 https://www.mozilla.org/en-US/security/advisories/mfsa2022-26
mfsa2022-26 https://www.mozilla.org/security/advisories/mfsa2022-26/
show_bug.cgi?id=1773717 https://bugzilla.mozilla.org/show_bug.cgi?id=1773717
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2022-34478.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N Found at https://bugzilla.mozilla.org/show_bug.cgi?id=1773717
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-04-15T18:14:23Z/ Found at https://bugzilla.mozilla.org/show_bug.cgi?id=1773717
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N Found at https://www.mozilla.org/security/advisories/mfsa2022-24/
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-04-15T18:14:23Z/ Found at https://www.mozilla.org/security/advisories/mfsa2022-24/
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N Found at https://www.mozilla.org/security/advisories/mfsa2022-25/
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-04-15T18:14:23Z/ Found at https://www.mozilla.org/security/advisories/mfsa2022-25/
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N Found at https://www.mozilla.org/security/advisories/mfsa2022-26/
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-04-15T18:14:23Z/ Found at https://www.mozilla.org/security/advisories/mfsa2022-26/
Exploit Prediction Scoring System (EPSS)
Percentile 0.35065
EPSS Score 0.00148
Published At May 29, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-05-29T08:26:47.387404+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2022/mfsa2022-25.yml 38.6.0