CVE-2025-10534

HIGHNVD 8.18.1—

8.1

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

CVSS v3: 8.1
EG Score: 8.1(medium)
EPSS: 24.4%
KEV: Not listed

Published

September 16, 2025

Last Modified

April 13, 2026

References (3)

security@mozillahttps://bugzilla.mozilla.org/show_bug.cgi?id=1665334
security@mozillahttps://www.mozilla.org/security/advisories/mfsa2025-73/
security@mozillahttps://www.mozilla.org/security/advisories/mfsa2025-77/

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-79Cross-site Scripting (XSS)

Data Freshness Timeline

(refreshed 12× in last 7d / 63× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-16 17:52 UTCEPSS rescore
2026-06-15 17:48 UTCEPSS rescore
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2026-06-14 23:17 UTCEPSS rescore
2026-06-13 22:59 UTCEPSS rescore
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2026-06-11 13:59 UTCEPSS rescore
2026-06-10 22:18 UTCEPSS rescore
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2026-06-04 13:11 UTCEPSS rescore
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2026-06-02 20:12 UTCEPSS rescore
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2026-06-01 13:51 UTCEPSS rescore
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2026-05-31 22:30 UTCEPSS rescore
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2026-05-31 00:16 UTCEPSS rescore
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2026-05-29 13:43 UTCEPSS rescore
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2026-05-27 13:40 UTCEPSS rescore
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2026-05-26 13:43 UTCEPSS rescore
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2026-05-26 07:18 UTCEPSS rescore
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2026-05-21 22:42 UTCEPSS rescore
2026-05-21 08:00 UTCEG score recompute
2026-05-21 08:00 UTCGHSA enrichment
2026-05-20 22:37 UTCEPSS rescore
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2026-05-20 11:21 UTCEPSS rescore
2026-05-18 21:30 UTCEPSS rescore
2026-05-18 21:30 UTCEPSS rescore

Frequently asked(5)

What is CVE-2025-10534?

CVE-2025-10534 is a high vulnerability published on September 16, 2025. Spoofing issue in the Site Permissions component. This vulnerability was fixed in Firefox 143 and Thunderbird 143.

When was CVE-2025-10534 disclosed?

CVE-2025-10534 was first published in the National Vulnerability Database on September 16, 2025, with the most recent update on April 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2025-10534 actively exploited?

CVE-2025-10534 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 24.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2025-10534?

CVE-2025-10534 has a CVSS v3 base score of 8.1 (NVD).

How do I remediate CVE-2025-10534?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-10534, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2025-10534

📅 Published

🔄 Last Modified

🔗 References (3)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2025-10534?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (3)

Frequently asked(5)

Related CVEs(same CWE)