CVE-2025-10534 | Spoofing issue in the Site Permissions component

Spoofing issue in the Site Permissions component. This vulnerability was fixed in Firefox 143 and Thunderbird 143.

Published: 2025-09-16 Last update: 2026-04-13 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-10534 is rated Low Risk (38.4/100): CVSS High severity, with low exploitation likelihood (EPSS 0.05%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2025-10534

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-02 0.03% 0.05% +0.03%
2 2026-02-12 0.06% 0.03% -0.03%
3 2026-01-16 — 0.06% —

Full EPSS history (4 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-10534

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.1 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 5.2 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2025-10534

OS Trackers for CVE-2025-10534

vendor priority summary link
alpine — CVE-2025-10534: 2 source package rows (firefox, thunderbird); 232 state rows across 2 repos (3.22-community, edge-community); fixed 0, open 232. https://security.alpinelinux.org/vuln/CVE-2025-10534
debian not yet assigned CVE-2025-10534 not yet assigned priority: Debian including 1 source packages (firefox), 1 status rows across 1 suites (sid): resolved 1. https://security-tracker.debian.org/tracker/CVE-2025-10534
redhat low — https://access.redhat.com/security/cve/CVE-2025-10534
ubuntu medium CVE-2025-10534 medium priority: Ubuntu including 2 source packages (firefox, thunderbird), 10 status rows across 5 suites (jammy, noble, plucky, questing, upstream): not-affected 8, needs-triage 2. https://ubuntu.com/security/CVE-2025-10534

Affected software / configurations for CVE-2025-10534

Vendor Product Version Raw CPE
mozilla firefox < 143.0 cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
mozilla thunderbird < 143.0 cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*

References for CVE-2025-10534

cvelogic Threat Intelligence