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CVE-2026-8391 | Mondoo Vulnerability Intelligence

Vulnerability IntelligenceCVE-2026-8391

CVE-2026-8391

MEDIUM5.3

Other issue in the JavaScript Engine component

Published May 12, 2026

Modified 1 weeks ago

Details

Other issue in the JavaScript Engine component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2038575

https://www.cve.org/CVERecord?id=CVE-2026-8391

https://www.mozilla.org/security/advisories/mfsa2026-45/

https://www.mozilla.org/security/advisories/mfsa2026-47/

https://www.mozilla.org/security/advisories/mfsa2026-48/

https://www.mozilla.org/security/advisories/mfsa2026-51/

CVSS Analysis

CVSS v3.1

5.3

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

LowAC:L

Privileges Required

NonePR:N

User Interaction

NoneUI:N

Scope

Scope

UnchangedS:U

Impact

Confidentiality

LowC:L

Integrity

NoneI:N

Availability

NoneA:N

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

Ecosystems

Timeline

PublishedMay 12, 2026

ModifiedMay 19, 2026