CVE-2011-5026

Exp

Cross-site scripting (XSS) vulnerability in the addPost function in data/functions.php in Winn GuestBook before 2.4.8d allows remote attackers to inject arbitrary web script or HTML via the name parameter to index.php. NOTE: some of these details are obtained from third party information.

Published: 2011-12-29 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2011-5026 is rated Exploit Available (59.4/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.69%). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +1.26% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2011-5026

EDB-ID Source Kind Published Link
18290 exploit_db edb 2011-12-29 Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2011-5026

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.43% 1.69% +1.26%
2 2026-04-17 0.47% 0.43% -0.04%
3 2026-03-06 — 0.47% —

Full EPSS history (12 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2011-5026

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2011-5026

Affected software / configurations for CVE-2011-5026

Vendor Product Version Raw CPE
winn winn_guestbook <= 2.4.8c cpe:2.3:a:winn:winn_guestbook:*:*:*:*:*:*:*:*
winn winn_guestbook 2.4.1 cpe:2.3:a:winn:winn_guestbook:2.4.1:beta:*:*:*:*:*:*
winn winn_guestbook 2.4.2 cpe:2.3:a:winn:winn_guestbook:2.4.2:*:*:*:*:*:*:*
winn winn_guestbook 2.4.3 cpe:2.3:a:winn:winn_guestbook:2.4.3:*:*:*:*:*:*:*
winn winn_guestbook 2.4.4 cpe:2.3:a:winn:winn_guestbook:2.4.4:*:*:*:*:*:*:*
winn winn_guestbook 2.4.5 cpe:2.3:a:winn:winn_guestbook:2.4.5:*:*:*:*:*:*:*
winn winn_guestbook 2.4.6 cpe:2.3:a:winn:winn_guestbook:2.4.6:*:*:*:*:*:*:*
winn winn_guestbook 2.4.7 cpe:2.3:a:winn:winn_guestbook:2.4.7:*:*:*:*:*:*:*
winn winn_guestbook 2.4.8b cpe:2.3:a:winn:winn_guestbook:2.4.8b:*:*:*:*:*:*:*

References for CVE-2011-5026

cvelogic Threat Intelligence