CVE-2026-8960
Description
Spoofing issue in WebExtensions. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
A spoofing vulnerability in WebExtensions could allow attackers to mislead users; fixed in Firefox 151 and Thunderbird 151.
Vulnerability
This spoofing vulnerability exists in the WebExtensions framework of Firefox and Thunderbird prior to version 151 [1][2]. The bug allows an attacker to spoof content or UI elements displayed through WebExtensions, potentially deceiving users.
Exploitation
No detailed exploitation method is publicly disclosed, but an attacker with the ability to influence a WebExtension (e.g., through a malicious extension or compromised website) could trigger the spoofing. User interaction may be required depending on the targeted UI element.
Impact
Successful exploitation could lead to user confusion or trust misdirection, as spoofed content may appear legitimate. The CVSSv3 score of 7.5 indicates high severity, reflecting potential for significant impact on confidentiality, integrity, or availability.
Mitigation
The vulnerability is fixed in Firefox 151 [1] and Thunderbird 151 [2], both released on May 19, 2026. Users are advised to update to the latest version. No workarounds beyond updating are available.
AI Insight generated on May 21, 2026. Synthesized from this CVE's description and the cited reference URLs; citations are validated against the source bundle.
Affected products
3- Range: <151
- Range: <151
- Range: <151
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
3- www.mozilla.org/security/advisories/mfsa2026-46/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-50/nvdVendor Advisory
- bugzilla.mozilla.org/show_bug.cginvdPermissions Required
News mentions
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