SessionApplication · Joomla
CVE-2015-8566
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedThe Session package 1.x before 1.3.1 for Joomla! Framework allows remote attackers to execute arbitrary code via unspecified session values.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceCode injection vulnerability in Joomla! Framework Session package versions prior to 1.3.1 allows remote attackers to execute arbitrary code through maliciously crafted session values. The vulnerability stems from insufficient validation of session data, enabling injection of arbitrary PHP code.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data
SessionApplication
= 1.3.0CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Authentication
- None
- Confidentiality
- Partial
- Integrity
- Partial
- Availability
- Partial
AV:N/AC:L/Au:N/C:P/I:P/A:P
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify Joomla Session package versionLocate the Joomla Framework Session package in your codebase (typically in composer.json, composer.lock, or the vendor/joomla/session directory) and retrieve the installed version numberAffected if The installed version is 1.3.0 (only this version is listed as affected)
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Review session handling implementationSearch your codebase for uses of the Joomla Session package, particularly session start, session set, or session storage operationsAffected if Your application uses Joomla Framework Session package version 1.3.0 for session handling
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Check for unvalidated session data processingAudit code that processes session values, looking for any deserialization, eval(), or dynamic code execution patterns on session data without validationAffected if Session values from storage are used in unsafe operations like unserialize() or eval() without prior validation
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Verify session storage configurationExamine how sessions are stored and retrieved - check if custom session handlers or external session storage (database, memcached, redis) are in use with Joomla SessionAffected if External session storage is configured and accepts user-controlled session data without validation
Your environment is affected if the Joomla Framework Session package version 1.3.0 is installed and your application processes session data without validation.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataUpgrade Joomla! Framework Session package to version 1.3.1 or later; audit application session handling and implement input validation on all session values.
Fix this in Session
Scoped from the published advisory
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,088.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2015-8566 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2015-8566 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data