CVE-2018-20149
In WordPress before 4.9.9 and 5.x before 5.0.1, when the Apache HTTP Server is used, authors could upload crafted files that bypass intended MIME type restrictions, leading to XSS, as demonstrated by a .jpg file without JPEG data.
Does this matter?
Lower severity and a low EPSS score (2.89%). Track it; it rarely justifies an emergency change on its own.
Description
In WordPress before 4.9.9 and 5.x before 5.0.1, when the Apache HTTP Server is used, authors could upload crafted files that bypass intended MIME type restrictions, leading to XSS, as demonstrated by a .jpg file without JPEG data.
- CVSS 3.0
- 5.4 MEDIUMCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 2.89% probability · 87th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-79
- Affected
- wordpress/wordpress · debian/debian linux
- Source
- cve@mitre.org
EPSS moved from 4.2% on 21 September 2026 to 2.9% on 27 October 2026.
References
- http://www.securityfocus.com/bid/106220Third Party Advisory, VDB Entry
- https://codex.wordpress.org/Version_4.9.9Product, Vendor Advisory
- https://github.com/WordPress/WordPress/commit/246a70bdbfac3bd45ff71c7941deef1bb206b19aPatch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/02/msg00019.htmlMailing List, Third Party Advisory
- https://wordpress.org/news/2018/12/wordpress-5-0-1-security-release/Release Notes, Vendor Advisory
- https://wordpress.org/support/wordpress-version/version-5-0-1/Release Notes, Vendor Advisory
- https://wpvulndb.com/vulnerabilities/9175Vendor Advisory
- https://www.debian.org/security/2019/dsa-4401Third Party Advisory
- https://www.zdnet.com/article/wordpress-plugs-bug-that-led-to-google-indexing-some-user-passwords/Press/Media Coverage, Third Party Advisory
- http://www.securityfocus.com/bid/106220Third Party Advisory, VDB Entry
- https://codex.wordpress.org/Version_4.9.9Product, Vendor Advisory
- https://github.com/WordPress/WordPress/commit/246a70bdbfac3bd45ff71c7941deef1bb206b19aPatch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/02/msg00019.htmlMailing List, Third Party Advisory
- https://wordpress.org/news/2018/12/wordpress-5-0-1-security-release/Release Notes, Vendor Advisory
- https://wordpress.org/support/wordpress-version/version-5-0-1/Release Notes, Vendor Advisory
- https://wpvulndb.com/vulnerabilities/9175Vendor Advisory
- https://www.debian.org/security/2019/dsa-4401Third Party Advisory
- https://www.zdnet.com/article/wordpress-plugs-bug-that-led-to-google-indexing-some-user-passwords/Press/Media Coverage, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.