CVE-2015-4520
Mozilla: Errors in the handling of CORS preflight request headers (MFSA 2015-111)
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Severity
ImportantRed Hat Product Security
CVSS 2.0
Review impact separately from score.
Published · September 22, 2015
Updated · November 21, 2025
Description
Mozilla Firefox before 41.0 and Firefox ESR 38.x before 38.3 allow remote attackers to bypass CORS preflight protection mechanisms by leveraging (1) duplicate cache-key generation or (2) retrieval of a value from an incorrect HTTP Access-Control-* response header.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 2.0 · 6.8AV:N/AC:M/Au:N/C:P/I:P/A:P
CWE-284 · Improper Access Control