CVE-2016-9900
External resources that should be blocked when loaded by SVG images can bypass security restrictions through the use of "data:" URLs.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (9.61%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
External resources that should be blocked when loaded by SVG images can bypass security restrictions through the use of "data:" URLs. This could allow for cross-domain data leakage. This vulnerability affects Firefox < 50.1, Firefox ESR < 45.6, and Thunderbird < 45.6.
- CVSS 3.0
- 7.5 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 9.61% probability · 95th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-254
- Affected
- debian/debian linux · redhat/enterprise linux · redhat/enterprise linux desktop · redhat/enterprise linux server · redhat/enterprise linux server aus · redhat/enterprise linux server eus · redhat/enterprise linux workstation · mozilla/thunderbird · mozilla/firefox
- Source
- security@mozilla.org
EPSS moved from 2.9% on 21 September 2026 to 9.6% on 27 October 2026, peaking at 9.8% on 22 September 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
References
- http://rhn.redhat.com/errata/RHSA-2016-2946.htmlThird Party Advisory
- http://rhn.redhat.com/errata/RHSA-2016-2973.htmlThird Party Advisory
- http://www.securityfocus.com/bid/94885Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1037461Third Party Advisory, VDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1319122Exploit, Issue Tracking, Patch, Vendor Advisory
- https://security.gentoo.org/glsa/201701-15Third Party Advisory
- https://www.debian.org/security/2017/dsa-3757Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2016-94/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2016-95/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2016-96/Vendor Advisory
- http://rhn.redhat.com/errata/RHSA-2016-2946.htmlThird Party Advisory
- http://rhn.redhat.com/errata/RHSA-2016-2973.htmlThird Party Advisory
- http://www.securityfocus.com/bid/94885Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1037461Third Party Advisory, VDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1319122Exploit, Issue Tracking, Patch, Vendor Advisory
- https://security.gentoo.org/glsa/201701-15Third Party Advisory
- https://www.debian.org/security/2017/dsa-3757Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2016-94/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2016-95/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2016-96/Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.