Description
The cookie authentication method in WordPress 2.5 relies on a hash of a concatenated string containing USERNAME and EXPIRY_TIME, which allows remote attackers to forge cookies by registering a username that results in the same concatenated string, as demonstrated by registering usernames beginning with "admin" to obtain administrator privileges, aka a "cryptographic splicing" issue. NOTE: this vulnerability exists because of an incomplete fix for CVE-2007-6013.
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 | 2.5.1-1 | — |
| Debian 13 | wordpress | 2.5.1-1 | — |
| Debian 12 | wordpress | 2.5.1-1 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
GitHub 1 repository
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HeisenbergH4X/CVE-2008-1930 ★ 0 · Jun 8, 2026
CVE-2008-1930 is a critical improper authentication vulnerability affecting the core cookie integrity mechanism in WordPress version 2.5. It allows remote attackers to bypass security controls, forge…
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- 28935 vdb-entry
- wordpress-cookie-security-bypass(42027) vdb-entry
- ADV-2008-1372 vdb-entry
- http://www.cl.cam.ac.uk/users/sjm217/advisories/wordpress-cookie-integrity.txt
- http://wordpress.org/development/2008/04/wordpress-251/
- 1019923 vdb-entry
- 29965 third-party-advisory
- 20080425 Wordpress 2.5 Cookie Integrity Protection Vulnerability mailing-list