login.php in Zenas PaoBacheca Guestbook 2.1, when register_globals is enabled, allows remote attackers to bypass authentication and gain ad…

published 2009-09-25 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-3403

cvss: 9.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 5.0%; EPSS 5.0% chance of exploitation in 30 days, percentile 92%
public exploits: 1; Exploit-DB

login.php in Zenas PaoBacheca Guestbook 2.1, when register_globals is enabled, allows remote attackers to bypass authentication and gain administrative access by setting the login_ok parameter to 1.

Timeline

2009-07-28 First public exploit (EDB-9293)
2009-09-25 Published

Exploit prediction

4.99% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

EDB-9293 PaoBacheca Guestbook 2.1 - 'login_ok' Authentication Bypass webapps, 2009-07-28
osvdb.org http://www.osvdb.org/56757 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	6.8	AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness

CWE-287 Improper Authentication

References

exploit-db.com /exploits/9293
exploit, third-party-advisory, vdb-entry
osvdb.org /56757
vdb-entry, broken-link, exploit
secunia.com /advisories/36023
third-party-advisory, broken-link, vendor-advisory
exchange.xforce.ibmcloud.com /vulnerabilities/52100
vdb-entry, third-party-advisory

Sources

CVE List CVE-2009-3421
NVD CVE-2009-3421

Fencer Vulns 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.

Summary