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NVD Vulnerability Details :

CVE-2025-10531

Modified

Source-security@mozilla.org

Published At-16 Sep, 2025 | 13:15

Updated At-13 Apr, 2026 | 15:16

Mitigation bypass in the Web Compatibility: Tooling component. This vulnerability was fixed in Firefox 143 and Thunderbird 143.

Date Added	Due Date	Vulnerability Name	Required Action
	N/A

Metrics

Type	Version	Base score	Base severity	Vector
Secondary	3.1	5.4	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Type: Secondary

Version: 3.1

Base score: 5.4

Base severity: MEDIUM

Vector:

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

CPE Matches

Mozilla Corporation

>>firefox>>Versions before 143.0(exclusive)

cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*

Mozilla Corporation

>>thunderbird>>Versions before 143.0(exclusive)

cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*

Weaknesses

CWE ID	Type	Source
CWE-288	Secondary	134c704f-9b21-4f2e-91b3-4a467353bcc0

CWE ID: CWE-288

Type: Secondary

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

References

Hyperlink	Source	Resource
https://bugzilla.mozilla.org/show_bug.cgi?id=1978453	security@mozilla.org	Permissions Required
https://www.mozilla.org/security/advisories/mfsa2025-73/	security@mozilla.org	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-77/	security@mozilla.org	Vendor Advisory

Hyperlink: https://bugzilla.mozilla.org/show_bug.cgi?id=1978453

Source: security@mozilla.org

Resource:

Permissions Required

Hyperlink: https://www.mozilla.org/security/advisories/mfsa2025-73/

Source: security@mozilla.org

Resource:

Vendor Advisory

Hyperlink: https://www.mozilla.org/security/advisories/mfsa2025-77/

Source: security@mozilla.org

Resource:

Vendor Advisory

CISA Catalog

Metrics

CPE Matches

Weaknesses

Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References

Change History