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Vulnerability details: VCID-7q66-66b2-kucc
Vulnerability ID VCID-7q66-66b2-kucc
Aliases CVE-2025-5266
Summary Script elements loading cross-origin resources generated load and error events which leaked information enabling XS-Leaks attacks.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-829 Inclusion of Functionality from Untrusted Control Sphere
System Score Found at
cvssv3 6.1 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-5266.json
epss 0.00434 https://api.first.org/data/v1/epss?cve=CVE-2025-5266
epss 0.00434 https://api.first.org/data/v1/epss?cve=CVE-2025-5266
epss 0.00434 https://api.first.org/data/v1/epss?cve=CVE-2025-5266
epss 0.00434 https://api.first.org/data/v1/epss?cve=CVE-2025-5266
epss 0.00434 https://api.first.org/data/v1/epss?cve=CVE-2025-5266
epss 0.00434 https://api.first.org/data/v1/epss?cve=CVE-2025-5266
epss 0.00434 https://api.first.org/data/v1/epss?cve=CVE-2025-5266
epss 0.00434 https://api.first.org/data/v1/epss?cve=CVE-2025-5266
epss 0.00434 https://api.first.org/data/v1/epss?cve=CVE-2025-5266
cvssv3.1 4.3 https://bugzilla.mozilla.org/show_bug.cgi?id=1965628
ssvc Track https://bugzilla.mozilla.org/show_bug.cgi?id=1965628
cvssv3.1 6.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2025-42
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2025-44
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2025-45
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2025-46
cvssv3.1 4.3 https://www.mozilla.org/security/advisories/mfsa2025-42/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2025-42/
cvssv3.1 4.3 https://www.mozilla.org/security/advisories/mfsa2025-44/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2025-44/
cvssv3.1 4.3 https://www.mozilla.org/security/advisories/mfsa2025-45/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2025-45/
cvssv3.1 4.3 https://www.mozilla.org/security/advisories/mfsa2025-46/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2025-46/
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-5266.json
https://api.first.org/data/v1/epss?cve=CVE-2025-5266
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-5266
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
2368755 https://bugzilla.redhat.com/show_bug.cgi?id=2368755
mfsa2025-42 https://www.mozilla.org/en-US/security/advisories/mfsa2025-42
mfsa2025-42 https://www.mozilla.org/security/advisories/mfsa2025-42/
mfsa2025-44 https://www.mozilla.org/en-US/security/advisories/mfsa2025-44
mfsa2025-44 https://www.mozilla.org/security/advisories/mfsa2025-44/
mfsa2025-45 https://www.mozilla.org/en-US/security/advisories/mfsa2025-45
mfsa2025-45 https://www.mozilla.org/security/advisories/mfsa2025-45/
mfsa2025-46 https://www.mozilla.org/en-US/security/advisories/mfsa2025-46
mfsa2025-46 https://www.mozilla.org/security/advisories/mfsa2025-46/
RHSA-2025:8293 https://access.redhat.com/errata/RHSA-2025:8293
RHSA-2025:8308 https://access.redhat.com/errata/RHSA-2025:8308
RHSA-2025:8341 https://access.redhat.com/errata/RHSA-2025:8341
RHSA-2025:8598 https://access.redhat.com/errata/RHSA-2025:8598
RHSA-2025:8599 https://access.redhat.com/errata/RHSA-2025:8599
RHSA-2025:8607 https://access.redhat.com/errata/RHSA-2025:8607
RHSA-2025:8608 https://access.redhat.com/errata/RHSA-2025:8608
RHSA-2025:8628 https://access.redhat.com/errata/RHSA-2025:8628
RHSA-2025:8629 https://access.redhat.com/errata/RHSA-2025:8629
RHSA-2025:8630 https://access.redhat.com/errata/RHSA-2025:8630
RHSA-2025:8631 https://access.redhat.com/errata/RHSA-2025:8631
RHSA-2025:8642 https://access.redhat.com/errata/RHSA-2025:8642
RHSA-2025:8756 https://access.redhat.com/errata/RHSA-2025:8756
RHSA-2025:9071 https://access.redhat.com/errata/RHSA-2025:9071
RHSA-2025:9072 https://access.redhat.com/errata/RHSA-2025:9072
RHSA-2025:9073 https://access.redhat.com/errata/RHSA-2025:9073
RHSA-2025:9074 https://access.redhat.com/errata/RHSA-2025:9074
RHSA-2025:9075 https://access.redhat.com/errata/RHSA-2025:9075
RHSA-2025:9076 https://access.redhat.com/errata/RHSA-2025:9076
RHSA-2025:9077 https://access.redhat.com/errata/RHSA-2025:9077
RHSA-2025:9155 https://access.redhat.com/errata/RHSA-2025:9155
show_bug.cgi?id=1965628 https://bugzilla.mozilla.org/show_bug.cgi?id=1965628
USN-7663-1 https://usn.ubuntu.com/7663-1/
No exploits are available.
Vector: CVSS:3.1/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-2025-5266.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:L/I:N/A:N Found at https://bugzilla.mozilla.org/show_bug.cgi?id=1965628
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/2025-09-23T14:44:04Z/ Found at https://bugzilla.mozilla.org/show_bug.cgi?id=1965628
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
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:L/I:N/A:N Found at https://www.mozilla.org/security/advisories/mfsa2025-42/
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/2025-09-23T14:44:04Z/ Found at https://www.mozilla.org/security/advisories/mfsa2025-42/
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N Found at https://www.mozilla.org/security/advisories/mfsa2025-44/
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/2025-09-23T14:44:04Z/ Found at https://www.mozilla.org/security/advisories/mfsa2025-44/
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N Found at https://www.mozilla.org/security/advisories/mfsa2025-45/
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/2025-09-23T14:44:04Z/ Found at https://www.mozilla.org/security/advisories/mfsa2025-45/
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N Found at https://www.mozilla.org/security/advisories/mfsa2025-46/
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/2025-09-23T14:44:04Z/ Found at https://www.mozilla.org/security/advisories/mfsa2025-46/
Exploit Prediction Scoring System (EPSS)
Percentile 0.62802
EPSS Score 0.00434
Published At April 2, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T13:16:48.807949+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2025/mfsa2025-42.yml 38.0.0