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Vulnerability CVE-2021-23986
Published: 2021-03-31
Description: |
A malicious extension with the 'search' permission could have installed a new search engine whose favicon referenced a cross-origin URL. The response to this cross-origin request could have been read by the extension, allowing a same-origin policy bypass by the extension, which should not have cross-origin permissions. This cross-origin request was made without cookies, so the sensitive information disclosed by the violation was limited to local-network resources or resources that perform IP-based authentication. This vulnerability affects Firefox < 87. |
Type:
CWE-346 (Origin Validation Error)
CVSS2 => (AV:N/AC:M/Au:N/C:P/I:N/A:N)
CVSS Base Score |
Impact Subscore |
Exploitability Subscore |
4.3/10 |
2.9/10 |
8.6/10 |
Exploit range |
Attack complexity |
Authentication |
Remote |
Medium |
No required |
Confidentiality impact |
Integrity impact |
Availability impact |
Partial |
None |
None |
References: |
https://bugzilla.mozilla.org/show_bug.cgi?id=1692623
https://www.mozilla.org/security/advisories/mfsa2021-10/
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