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CVE-2015-8562

91
FAUCET Score

CVE-2015-8562 is a critical PHP object injection vulnerability affecting Joomla! versions 1.5.x, 2.x, and 3.x before 3.4.6, allowing remote attackers to execute arbitrary PHP code. It has a CVSS score of 7.5, indicating high severity due to its network-based attack vector, low attack complexity, and potential for complete compromise of confidentiality, integrity, and availability. This vulnerability was actively exploited in the wild in December 2015, with multiple public exploits available, including Metasploit modules and Nuclei templates, and has garnered significant community discussion and media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
1.5.0CPE matchmatch criteria
cpe:2.3:a:joomla:joomla\!:1.5.0:*:*:*:*:*:*:*
1.5.1CPE matchmatch criteria
cpe:2.3:a:joomla:joomla\!:1.5.1:*:*:*:*:*:*:*
1.5.2CPE matchmatch criteria
cpe:2.3:a:joomla:joomla\!:1.5.2:*:*:*:*:*:*:*
1.5.3CPE matchmatch criteria
cpe:2.3:a:joomla:joomla\!:1.5.3:*:*:*:*:*:*:*
1.5.4CPE matchmatch criteria
cpe:2.3:a:joomla:joomla\!:1.5.4:*:*:*:*:*:*:*

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
98.28%
Probability of exploitation in next 30 days
EPSS Percentile
99.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
Metasploit: Joomla HTTP Header Unauthenticated Remote Code Execution · Dec 14, 2015
Nuclei: CVE-2015-8562 · Aug 8, 2024
ExploitDB: EDB-39033 · Dec 18, 2015
This CVE's current EPSS score of 0.9828 is in the 100th percentile among its peer group of 51,485 CVEs.

Social Chatter

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

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

packetstormsecurity.com / files/134949/Joomla-HTTP-Header-Unauthenticated-Remote-Code-Execution.html
Exploit
packetstormsecurity.com / files/135100/Joomla-3.4.5-Object-Injection.html
blog.sucuri.net / 2015/12/remote-command-execution-vulnerability-in-joomla.html
Exploit
developer.joomla.org / security-centre/630-20151214-core-remote-code-execution-vulnerability.html
Vendor Advisory
exploit-db.com / exploits/38977
Exploit
exploit-db.com / exploits/39033
Exploit
rapid7.com / db/modules/exploit/multi/http/joomla_http_header_rce
securityfocus.com / archive/1/537219/100/0/threaded
securityfocus.com / bid/79195