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NetweaverApplication · Sap

CVE-2018-2476

MEDIUM · 6.1 CVSS v3.0 Published 2018-11-13
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
68/100
Remediation priority · Elevated
Remotely reachable No privileges

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
Due to insufficient URL Validation in forums in SAP NetWeaver versions 7.30, 7.31, 7.40, an attacker can redirect users to a malicious site.

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 · moderate confidence

This is an open redirect vulnerability in SAP NetWeaver's forum component caused by insufficient URL validation. Attackers can craft malicious URLs that redirect users to external phishing or malware sites, leveraging the trusted domain of the SAP application to bypass user suspicion.

MitigationImplement strict allowlist-based URL validation in the forum component to ensure all redirect targets are within trusted domains, and validate redirect URLs server-side before issuing the redirect response.

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
NetweaverApplication
Affected:= 7.30= 7.31= 7.40

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
Privileges
None
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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. Identify installed SAP NetWeaver version
    Check the SAP NetWeaver version by accessing the SAP System Information page (typically at /sap/public/info) or by running the SAP kernel version command 'SAPCAR -tvf <kernel_archive>' or checking the 'kernel' directory for version files. Compare the version number to the affected releases: 7.30, 7.31, or 7.40.
    Affected if The installed version matches exactly 7.30, 7.31, or 7.40 (exact version match required per the CVE description)
  2. Verify forum component is deployed
    Check if the SAP NetWeaver Forum component (Web Dynpro for Java forum application) is installed by examining the SAP Application Server Java deployment via the SAP Management Console or by accessing the SAP System Landscape Directory. Look for packages or applications containing 'forum' in the name.
    Affected if The forum component is installed and running on the affected NetWeaver version
  3. Confirm redirect functionality is accessible
    Attempt to access the forum application's redirect or navigation endpoints. Typically these are under the forum's URL handler paths. Check whether unauthenticated or authenticated users can trigger redirect operations through forum posts, profile links, or navigation controls.
    Affected if The forum component has active redirect or link-forwarding functionality that processes external URLs
  4. Inspect URL validation configuration
    Review the forum component's configuration files (such as the Web Dynpro configuration or any custom URL handler settings) for any URL validation or redirect allowlist settings. Check whether the application validates redirect targets against a whitelist of allowed domains.
    Affected if No strict allowlist-based URL validation is configured, or validation can be bypassed

You are affected if your SAP NetWeaver installation is exactly version 7.30, 7.31, or 7.40 AND the forum component is deployed with redirect functionality accessible and without proper URL allowlist validation.

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
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Implement strict allowlist-based URL validation in the forum component to ensure all redirect targets are within trusted domains, and validate redirect URLs server-side before issuing the redirect response.

Fix this in Netweaver Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA1.0 h
10.0 hours of engineering $1,750
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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-2018-2476 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