CVE-2017-7787

Mozilla: Same-origin policy bypass with iframes through page reloads (MFSA 2017-19)

Loading…

Severity

Important

Red Hat Product Security

7.5

CVSS 3.0

Review impact separately from score.

Published · August 8, 2017

Updated · November 22, 2025

Description

Same-origin policy protections can be bypassed on pages with embedded iframes during page reloads, allowing the iframes to access content on the top level page, leading to information disclosure. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.

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 3.0 · 7.5
CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE-863 · Incorrect Authorization