MediaElement Vulnerable to Reflected XSS

Description

Cross-site scripting (XSS) vulnerability in flash/FlashMediaElement.swf in MediaElement.js before 2.21.0, as used in WordPress before 4.5.2, allows remote attackers to inject arbitrary web script or HTML via an obfuscated form of the jsinitfunction parameter, as demonstrated by “jsinitfunctio%gn.

Recommendation

Update the mediaelement package to the latest compatible version. Followings are version details:

• Affected version(s): < 2.11.1
• Patched version(s): 2.11.1

References

• GHSA-277w-qpxr-2549
• codex.wordpress.org
• core.trac.wordpress.org
• wordpress.org
• wpvulndb.com
• www.openwall.com
• www.securitytracker.com
• contao.org
• web.archive.org
• CVE-2016-4567
• CWE-79
• CAPEC-310
• OWASP 2021-A3
• OWASP 2021-A6

Related Issues

• Formstone Vulnerable to Reflected XSS - CVE-2020-26768
• bracket-template vulnerable to reflected XSS - CVE-2018-3735
• Nuxt OG Image is vulnerable to reflected XSS via query parameter injection into HTML attributes - CVE-2026-34405
• Webrecorder packages are vulnerable to XSS through 404 error handling logic - CVE-2025-58765

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Tags:

npm

mediaelement