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Opera BrowserApplication · Opera

CVE-2011-4682

MEDIUM · 6.4 CVSS v2.0 Published 2011-12-07
Fix available
A fix is available. Upgrade to after 11.60 or later.
See remediation →
73/100
Remediation priority · Elevated
Remotely reachable No privileges Zero-click

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 · unedited
The JavaScript engine in Opera before 11.60 does not properly implement the in operator, which allows remote attackers to bypass the Same Origin Policy via vectors related to variables on different web sites.

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 confidence

The JavaScript engine in Opera before 11.60 has a flaw in its implementation of the 'in' operator that allows cross-origin property access, enabling attackers to bypass the Same Origin Policy by accessing variables from different websites through JavaScript.

MitigationUpgrade Opera browser to version 11.60 or later to resolve the JavaScript engine flaw that allows Same Origin Policy bypass.

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
Opera BrowserApplication
Affected:<= 11.60= 5.0= 5.02= 5.10= 5.11= 5.12= 6.0= 6.1= 6.01= 6.02= 6.03= 6.04

CVSS 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
None

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

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 checks

Work through these to decide whether this CVE applies to you.

  1. Verify Opera Browser is installed
    Check for Opera executable in typical installation locations: %ProgramFiles%\Opera\opera.exe on Windows, /Applications/Opera.app on macOS, or look for Opera in the system package manager on Linux
    Affected if Opera Browser is found on the system
  2. Determine installed Opera version number
    Open Opera, go to Help > About Opera, or right-click opera.exe and select Properties > Details to view the version field
    Affected if The version displayed is 11.60 or lower, or matches one of these older versions: 5.0, 5.02, 5.10, 5.11, 5.12, 6.0, 6.1, 6.01, 6.02, 6.03, or 6.04
  3. Confirm JavaScript engine is in use
    Verify that JavaScript is enabled in Opera settings (Menu > Settings > Preferences > Advanced > Content), as the vulnerability exists in the JavaScript engine's 'in' operator implementation
    Affected if JavaScript is enabled and the Opera version is in the affected list

The user is affected if Opera Browser version 11.60 or lower (or any of the specific older versions 5.x-6.x listed) is installed with JavaScript enabled on the system.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 data
Upgrade available Upgrade to a release after 11.60
Interim mitigation

Upgrade Opera browser to version 11.60 or later to resolve the JavaScript engine flaw that allows Same Origin Policy bypass.

Fix this in Opera Browser Scoped from the published advisory
  • Consultation1.0 h
  • Testing1.0 h
  • Review / QA1.0 h
3.0 hours of engineering $750
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,200.

Scan for this in your stack

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2011-4682 in production — separate from our analysis above.

No notes yet

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What this is

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.

What belongs here
  • 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