CVEvulnerability
CVE-2021-23984
6.5 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2021-03-31
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 6.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
- CVSS 2.0 ([email protected])
- 4.3 MEDIUM — AV:N/AC:M/Au:N/C:N/I:P/A:N
- Weaknesses
- CWE-290
Description
A malicious extension could have opened a popup window lacking an address bar. The title of the popup lacking an address bar should not be fully controllable, but in this situation was. This could have been used to spoof a website and attempt to trick the user into providing credentials. This vulnerability affects Firefox ESR < 78.9, Firefox < 87, and Thunderbird < 78.9.
Affected configurations
• mozilla firefox (< 87.0)
• mozilla firefox esr (< 78.9)
• mozilla thunderbird (< 78.9)
Related
Weakness · CWE (1)
- CWE-290 Authentication Bypass by Spoofing weakness
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1693664 Issue Tracking, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-10/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-11/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-12/ Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1693664 Issue Tracking, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-10/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-11/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-12/ Vendor Advisory