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CVE-2008-5840

29
FAUCET Score

CVE-2008-5840 describes an authentication bypass vulnerability in PHP iCalendar versions 2.24 and earlier. Attackers can gain unauthorized access by manipulating specific cookies, specifically by setting 'phpicalendar' and 'phpicalendar_login' to '1'. This vulnerability has a CVSS score of 7.5, indicating high severity due to its network-based attack vector, low attack complexity, and potential for partial compromise of confidentiality, integrity, and availability. While not listed on the KEV catalog, an exploit (EDB-6526) is publicly available on ExploitDB, and there is some community discussion surrounding it, though no active exploitation or Metasploit/Nuclei modules are noted.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.24CPE matchmatch criteria
cpe:2.3:a:phpicalendar:phpicalendar:*:*:*:*:*:*:*:*
0.7CPE matchmatch criteria
cpe:2.3:a:phpicalendar:phpicalendar:0.7:*:*:*:*:*:*:*
0.8CPE matchmatch criteria
cpe:2.3:a:phpicalendar:phpicalendar:0.8:*:*:*:*:*:*:*
0.9CPE matchmatch criteria
cpe:2.3:a:phpicalendar:phpicalendar:0.9:*:*:*:*:*:*:*
0.9.5CPE matchmatch criteria
cpe:2.3:a:phpicalendar:phpicalendar:0.9.5:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

7.5HIGH

AV:N/AC:L/Au:N/C:P/I:P/A:P

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
6.4
CvssVersion
2.0

Exploit Intelligence

EPSS Score
3.02%
Probability of exploitation in next 30 days
EPSS Percentile
86.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
ExploitDB: EDB-6526 · Sep 22, 2008
This CVE's current EPSS score of 0.0302 is in the 75th percentile among its peer group of 51,455 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

securityreason.com / securityalert/4865
exchange.xforce.ibmcloud.com / vulnerabilities/45338
exploit-db.com / exploits/6526
securityfocus.com / bid/31320
Exploit