CVE-2026-0881

CRITICALNVD 10.010.0—

10.0

Sandbox escape in the Messaging System component. This vulnerability was fixed in Firefox 147 and Thunderbird 147.

CVSS v3: 10.0
EG Score: 10.0(medium)
EPSS: 10.4%
KEV: Not listed

Published

January 13, 2026

Last Modified

April 13, 2026

Advisory Details (3)

Auto-updated May 15, 2026

No patch confirmed yet.

generic

Security Vulnerabilities fixed in Thunderbird 147 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-04/

generic

Security Vulnerabilities fixed in Firefox 147 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-01/

generic

Access Denied

https://bugzilla.mozilla.org/show_bug.cgi?id=2005845

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:13 UTCepss_batch
2026-06-02 20:13 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
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2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-26 13:44 UTCepss_batch
2026-05-26 13:44 UTCepss_batch

Frequently asked(5)

What is CVE-2026-0881?

CVE-2026-0881 is a critical vulnerability published on January 13, 2026. Sandbox escape in the Messaging System component. This vulnerability was fixed in Firefox 147 and Thunderbird 147.

When was CVE-2026-0881 disclosed?

CVE-2026-0881 was first published in the National Vulnerability Database on January 13, 2026, 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-2026-0881 actively exploited?

CVE-2026-0881 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 10.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-0881?

CVE-2026-0881 has a CVSS v3 base score of 10.0 (NVD).

How do I remediate CVE-2026-0881?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-0881, 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-2026-0881

📅 Published

🔄 Last Modified

📋 Advisory Details (3)

Security Vulnerabilities fixed in Thunderbird 147 — Mozilla

Security Vulnerabilities fixed in Firefox 147 — Mozilla

Access Denied

Weakness Classification(2)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2026-0881?

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Published

Last Modified

Advisory Details (3)

Frequently asked(5)

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