CVE-2016-9263
WordPress through 4.8.2, when domain-based flashmediaelement.swf sandboxing is not used, allows remote attackers to conduct cross-domain Flash injection (XSF) attacks by leveraging code contained within the…
Does this matter?
Lower severity and a low EPSS score (2.17%). Track it; it rarely justifies an emergency change on its own.
Description
WordPress through 4.8.2, when domain-based flashmediaelement.swf sandboxing is not used, allows remote attackers to conduct cross-domain Flash injection (XSF) attacks by leveraging code contained within the wp-includes/js/mediaelement/flashmediaelement.swf file.
- CVSS 3.0
- 4.7 MEDIUMCVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 2.17% probability · 82th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- wordpress/wordpress
- Source
- cve@mitre.org
EPSS moved from 3.3% on 21 September 2026 to 2.2% on 27 October 2026.
References
- http://www.securityfocus.com/bid/101294Third Party Advisory, VDB Entry
- https://opnsec.com/2017/10/cve-2016-9263-unpatched-xsf-vulnerability-in-wordpress/Mitigation, Third Party Advisory
- http://www.securityfocus.com/bid/101294Third Party Advisory, VDB Entry
- https://opnsec.com/2017/10/cve-2016-9263-unpatched-xsf-vulnerability-in-wordpress/Mitigation, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.