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CVE-2021-23976

Date: February 25, 2021

When accepting a malicious intent from other installed apps, Firefox for Android accepted manifests from arbitrary file paths and allowed declaring webapp manifests for other origins. This could be used to gain fullscreen access for UI spoofing and could also lead to cross-origin attacks on targeted websites. Note: This issue is a different issue from CVE-2020-26954 and only affected Firefox for Android. Other operating systems are unaffected. This vulnerability affects Firefox < 86.

Severity Score

Related Resources (6)

https://www.mozilla.org/security/advisories/mfsa2021-07/
https://security.gentoo.org/glsa/202104-10
https://security.alpinelinux.org/vuln/CVE-2021-23976
https://nvd.nist.gov/vuln/detail/CVE-2021-23976
https://bugzilla.mozilla.org/show_bug.cgi?id=1684627
https://www.mend.io/vulnerability-database/CVE-2021-23976

Severity Score

Weakness Type (CWE)

Improper Restriction of Rendered UI Layers or Frames

CWE-1021

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): PARTIAL
Availability (A): NONE
Additional information:

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