Description
The wp_http_validate_url function in wp-includes/http.php in WordPress before 4.4.2 allows remote attackers to conduct server-side request forgery (SSRF) attacks via a zero value in the first octet of an IPv4 address in the u parameter to wp-admin/press-this.php.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | wordpress | 4.4.2+dfsg-1 | — |
| Debian 13 | wordpress | 4.4.2+dfsg-1 | — |
| Debian 12 | wordpress | 4.4.2+dfsg-1 | — |
| Debian 8 | wordpress | 4.1+dfsg-1+deb8u8 | DSA-3472-1 |
| Debian 7 | wordpress | 3.6.1+dfsg-1~deb7u10 | DSA-3472-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 6.0 | wordpress | 3.6.1+dfsg-1~deb6u9 | DLA-418-1 |
Advisories 2
- DSA-3472-1 wordpress - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-418-1 wordpress - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- https://codex.wordpress.org/Version_4.4.2
- 1034933 vdb-entry
- https://wpvulndb.com/vulnerabilities/8376
- https://core.trac.wordpress.org/changeset/36435
- 82454 vdb-entry
- https://wordpress.org/news/2016/02/wordpress-4-4-2-security-and-maintenance-release/
- DSA-3472 vendor-advisory
- https://hackerone.com/reports/110801
- https://news.ycombinator.com/item?id=20433070