VulnerabilityModified
CVE-2020-12391
This allowed the execution of scripts that should have been blocked, albeit with a unique opaque origin.
HIGH 7.5EPSS 1.35%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.35%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Documents formed using data: URLs in an OBJECT element failed to inherit the CSP of the creating context. This allowed the execution of scripts that should have been blocked, albeit with a unique opaque origin. This vulnerability affects Firefox < 76.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 1.35% probability · 70th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-863
- Affected
- mozilla/firefox
- Source
- security@mozilla.org
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1457100Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2020-16/Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1457100Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2020-16/Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.