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CVE-2021-23976

8.1 · HIGH

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.

Published Feb 26, 2021CWE-1021EPSS 1.10%

Overview

CVE-2021-23976 is a high-severity vulnerability. It was published on February 26, 2021 and has a CVSS 3.1 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refbugzilla.mozilla.org/show_bug.cgi?id=1684627Refsecurity.gentoo.org/glsa/202104-10Refwww.mozilla.org/security/advisories/mfsa2021-07/Refbugzilla.mozilla.org/show_bug.cgi?id=1684627Refsecurity.gentoo.org/glsa/202104-10Refwww.mozilla.org/security/advisories/mfsa2021-07/

How CyberStrike helps

Frequently asked questions

What is CVE-2021-23976?

CVE-2021-23976 is a high-severity vulnerability. It was published on February 26, 2021 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2021-23976?

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-23976?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-23976?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-23976 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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