CVE-2018-20149 json
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 intende…
published 2018-12-14 7 y ago modified 2026-06-17 4 mo ago also EUVD-2018-12718
- cvss
- 5.4
- version 3.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.9%
- EPSS 2.9% chance of exploitation in 30 days, percentile 87%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- wordpress wordpress 4.9.9, 5.0.1
- wordpress Debian 14, Debian 13, Debian 12 5.0.1+dfsg1-1
debian advisories DEBIAN-CVE-2018-20149
Exploit prediction
2.89% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.0 | 5.4 | CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 3.5 | AV:N/AC:M/Au:S/C:N/I:P/A:N |
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
- Technology feeds
References
-
github.com
/WordPress/WordPress/commit/246a70bdbfac3bd45ff71c7941deef1bb206b19a
patch, third-party-advisory
-
debian.org
/security/2019/dsa-4401
vendor-advisory, third-party-advisory
-
wordpress.org
/support/wordpress-version/version-5-0-1/
release-notes, vendor-advisory
-
codex.wordpress.org
/Version_4.9.9
product, vendor-advisory
-
wpvulndb.com
/vulnerabilities/9175
vendor-advisory
-
wordpress.org
/news/2018/12/wordpress-5-0-1-security-release/
release-notes, vendor-advisory
-
securityfocus.com
/bid/106220
vdb-entry, third-party-advisory
-
lists.debian.org
/debian-lts-announce/2019/02/msg00019.html
mailing-list, third-party-advisory
-
zdnet.com
/article/wordpress-plugs-bug-that-led-to-google-indexing-some-user-passwords/
press/media-coverage, third-party-advisory
Sources
- CVE List CVE-2018-20149
- NVD CVE-2018-20149
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.