CVE-2015-8562: n/a vulnerability

CVE-2015-8562: Joomla!

Joomla! 1.5.x, 2.x, and 3.x before 3.4.6 allow remote attackers to conduct PHP object injection attacks and execute arbitrary PHP code via the HTTP User-Agent header, as exploited in the wild in December 2015.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 6, 2024, 08:20 UTC (UTC+00:00)

Security readout for executives and security teams

This is a serious Joomla remote code execution issue. A vulnerable public website could be taken over through crafted HTTP header data, without credentials. Historical sources say it was exploited in the wild in December 2015, so any still-unpatched Joomla instance should be treated as high-risk. Exposure is most likely on internet-facing Joomla sites running 1.5.x, 2.x, or 3.x before 3.4.6. Legacy Joomla deployments, forgotten marketing sites, and externally hosted CMS instances are the highest-probability assets. Treat this as urgent for any legacy Joomla exposure. The issue enables unauthenticated site compromise and has documented historical exploitation. The business priority is rapid asset discovery, patch confirmation, and compromise review for any affected public CMS. Mitigation focus: Upgrade affected Joomla installations to 3.4.6 or later per Joomla guidance.; Retire or isolate unsupported Joomla 1.5.x and 2.x deployments.; Check vendor guidance for any version-specific hardening or backport instructions..

Prepared: Jun 13, 2026, 21:26 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Dec 16, 2015, 21:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

5Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
39033CVE reference · exploit, x_refsource_EXPLOIT-DB
38977CVE reference · exploit, x_refsource_EXPLOIT-DB
https://developer.joomla.org/security-centre/630-20151214-core-remote-code-execution-vulnerability.htmlCVE reference · x_refsource_CONFIRM
https://blog.sucuri.net/2015/12/remote-command-execution-vulnerability-in-joomla.htmlCVE reference · x_refsource_MISC

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

No CWE listed

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