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CVE-2015-8566

31
FAUCET Score

CVE-2015-8566 describes a critical arbitrary code execution vulnerability in the Session package versions prior to 1.3.1 within the Joomla! Framework. This flaw allows remote attackers to execute arbitrary code by manipulating unspecified session values. With a CVSS score of 7.5 (High), this vulnerability is easily exploitable over the network with low attack complexity, potentially leading to full compromise of confidentiality, integrity, and availability. While not listed in CISA's KEV catalog, an exploit (EDB-39033) for Joomla! versions 1.5 through 3.4.6 leveraging object injection via the 'x-forwarded-for' header is publicly available, indicating a known attack vector. Despite the public exploit, there is minimal community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
1.3.0CPE matchmatch criteria
cpe:2.3:a:joomla:session:1.3.0:*:*:*:*:*:*:*

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
8.46%
Probability of exploitation in next 30 days
EPSS Percentile
94.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
ExploitDB: EDB-39033 · Dec 18, 2015
This CVE's current EPSS score of 0.0846 is in the 91st percentile among its peer group of 51,485 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

Patch Available

Vendor Patches (1)

composerpatch availablevia ghsa
Product: joomla/sessionFixed in: 1.3.1

Vendor Advisories (1)

composerGHSA-wwfh-28hx-w2r2high

Joomla! Framework Remote Code Injection Vulnerability

May 17, 2022

References

developer.joomla.org / security-centre/637-20151205-session-remote-code-execution-vulnerability.html
Vendor Advisory
securityfocus.com / bid/79197