CVE-2021-23953

Mozilla: Cross-origin information leakage via redirected PDF requests

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Severity

Important

Red Hat Product Security

4.3

CVSS 3.1

Review impact separately from score.

Published · January 26, 2021

Updated · November 22, 2025

Description

The Mozilla Foundation Security Advisory describes this flaw as:

If a user clicked into a specifically crafted PDF, the PDF reader could be confused into leaking cross-origin information, when said information is served as chunked data.

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 3.1 · 4.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

CWE-829 · Inclusion of Functionality from Untrusted Control Sphere