CVE-2008-5840

Exp

PHP iCalendar 2.24 and earlier allows remote attackers to bypass authentication by setting the phpicalendar and phpicalendar_login cookies to 1.

Published: 2009-01-05 Last update: 2026-04-23 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2008-5840 is rated High Exploit Risk (75/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.26%). 2 public exploit reference(s) are indexed (Exploit-DB). 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-2008-5840

EDB-ID Source Kind Published Link
6526 exploit_db edb 2008-09-22 Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2008-5840

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 2026-02-25 1.77% 2.26% +0.49%
2 2026-01-05 1.59% 1.77% +0.18%
3 2025-12-13 — 1.59% —

Full EPSS history (11 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2008-5840

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2008-5840

Affected software / configurations for CVE-2008-5840

Vendor Product Version Raw CPE
phpicalendar phpicalendar <= 2.24 cpe:2.3:a:phpicalendar:phpicalendar:*:*:*:*:*:*:*:*
phpicalendar phpicalendar 0.7 cpe:2.3:a:phpicalendar:phpicalendar:0.7:*:*:*:*:*:*:*
phpicalendar phpicalendar 0.8 cpe:2.3:a:phpicalendar:phpicalendar:0.8:*:*:*:*:*:*:*
phpicalendar phpicalendar 0.9 cpe:2.3:a:phpicalendar:phpicalendar:0.9:*:*:*:*:*:*:*
phpicalendar phpicalendar 0.9.5 cpe:2.3:a:phpicalendar:phpicalendar:0.9.5:*:*:*:*:*:*:*
phpicalendar phpicalendar 1.0 cpe:2.3:a:phpicalendar:phpicalendar:1.0:*:*:*:*:*:*:*
phpicalendar phpicalendar 1.1 cpe:2.3:a:phpicalendar:phpicalendar:1.1:*:*:*:*:*:*:*
phpicalendar phpicalendar 2.0 cpe:2.3:a:phpicalendar:phpicalendar:2.0:beta:*:*:*:*:*:*
phpicalendar phpicalendar 2.0.1 cpe:2.3:a:phpicalendar:phpicalendar:2.0.1:*:*:*:*:*:*:*
phpicalendar phpicalendar 2.0c cpe:2.3:a:phpicalendar:phpicalendar:2.0c:*:*:*:*:*:*:*
phpicalendar phpicalendar 2.1 cpe:2.3:a:phpicalendar:phpicalendar:2.1:*:*:*:*:*:*:*
phpicalendar phpicalendar 2.2 cpe:2.3:a:phpicalendar:phpicalendar:2.2:*:*:*:*:*:*:*
phpicalendar phpicalendar 2.21 cpe:2.3:a:phpicalendar:phpicalendar:2.21:*:*:*:*:*:*:*
phpicalendar phpicalendar 2.22 cpe:2.3:a:phpicalendar:phpicalendar:2.22:*:*:*:*:*:*:*
phpicalendar phpicalendar 2.23 cpe:2.3:a:phpicalendar:phpicalendar:2.23:*:*:*:*:*:*:*
phpicalendar phpicalendar 2.23 cpe:2.3:a:phpicalendar:phpicalendar:2.23:rc1:*:*:*:*:*:*
phpicalendar phpicalendar2.0 alpha_test cpe:2.3:a:phpicalendar:phpicalendar2.0:alpha_test:*:*:*:*:*:*:*

References for CVE-2008-5840

cvelogic Threat Intelligence