CVE-2026-89122

Executive Summary

CVE-2026-89122 is an unauthenticated open-redirect / content-injection vulnerability (CWE-601) in an unspecified component of the SAP NetWeaver Enterprise Portal. The flaw stems from insufficient validation of user-supplied input to a portal component, allowing an attacker to craft a malicious link that, when clicked by an authenticated victim, loads attacker-controlled content inside the trusted application context. Successful exploitation yields a low impact to confidentiality and integrity (user tracking and partial page defacement) with no availability impact, scoring 6.1 under CVSS v3.1. No public proof-of-concept, exploit code, Nuclei template, or patch currently exists, and the CVE has not been added to CISA KEV.

Technical Analysis

The vulnerability is classified as CWE-601 (URL Redirection to Untrusted Site, commonly termed "Open Redirect"). According to the NVD description, SAP NetWeaver Enterprise Portal "does not sufficiently validate input to a certain portal component." The precise component, parameter, and input-handling routine are not disclosed in the available data; the analysis below therefore remains at the vulnerability-class level.

Open redirect flaws arise when an application accepts a user-controllable value—typically a URL, path, or navigation target—and uses it to determine where the client is subsequently sent or what content is rendered, without validating that the destination belongs to a trusted domain or origin. In the context of a web portal such as SAP NetWeaver Enterprise Portal, this class of weakness is particularly dangerous because the portal operates as an authenticated, trusted content aggregation layer. Content loaded into the portal's rendering context inherits the trust relationship the browser has established with the portal domain.

The critical modifier here is the CVSS scope change (S:C). A scope-changing open redirect / content-injection flaw means the exploited component can affect resources beyond its original security authority. Because the attacker-controlled content is loaded "within the trusted application context," the browser treats the injected content as originating from, or rendered by, the legitimate portal origin. This enables two distinct downstream effects that the NVD explicitly names:

1. User tracking — the attacker-controlled content can exfiltrate information about the victim (for example, requests that reveal the user's identity, session context, or navigation behavior) to attacker infrastructure. This is the C:L (low confidentiality) impact.
2. Page defacement — the attacker-controlled content can modify or replace portions of the rendered page ("deface parts of the rendered page"), corrupting the integrity of what the victim sees. This is the I:L (low integrity) impact.

There is no availability impact (A:N), consistent with an injection/redirection flaw that does not disrupt service. The attack vector is network-based (AV:N), requires no privileges (PR:N), has low complexity (AC:L), but requires user interaction (UI:R) — the victim must click the crafted link, which is why the base score lands at 6.1 rather than higher.

The combination of CWE-601 with a scope change and content rendering inside the trusted context distinguishes this from a simple reflected redirect. The attacker is not merely bouncing the victim to an external site; they are injecting content that executes and renders under the portal's origin authority. This is the mechanism behind the confidentiality and integrity impacts.

Because the affected component and input parameter are not disclosed, defenders cannot construct a targeted input-validation patch from the advisory text alone. No affected version list, no OSV package mapping, and no patch source were provided, meaning the exposure window remains open for all deployments of the affected portal component until SAP publishes remediation.

Exploitation Scenarios

No public PoC is available; the attack chain described below is inferred strictly from the vulnerability class (CWE-601) and the NVD description. No function names, endpoints, or parameters are asserted because none are disclosed.

1. Reconnaissance / target identification. The attacker identifies reachable SAP NetWeaver Enterprise Portal instances, for example via internet-wide scanning or Shodan queries for the portal login/landing pages. The attacker does not require credentials, since the flaw is triggerable by an unauthenticated attacker who only needs a victim to interact.

2. Triggering the flaw class. The attacker crafts a malicious link that supplies attacker-controlled input to the vulnerable portal component. Because the component "does not sufficiently validate input," the value is accepted without being constrained to a trusted destination or safe rendering context. The attacker delivers this link via phishing email, chat, or social engineering, targeting a victim who is or will be authenticated to the portal.

3. Payload / execution method (class level). When the victim clicks the link, the portal processes the unvalidated input and loads attacker-controlled content within the trusted application context. The content is rendered as though it belongs to the legitimate portal origin. The attacker does not need to execute server-side code; the impact is realized in the victim's browser under the portal's trust boundary.

4. Post-exploitation impact. Two effects follow, per the NVD: (a) tracking of user information — the injected content can observe or relay details about the victim to the attacker, degrading confidentiality; and (b) defacement of parts of the rendered page — degrading the integrity of the portal UI the victim sees. No availability impact is expected, and there is no evidence in the provided data of lateral movement, code execution, or credential theft as a direct consequence of this CVE.

The user-interaction requirement (UI:R) is the primary exploitation constraint: mass, drive-by compromise without a click is not indicated. Successful campaigns would rely on convincing lures that induce the victim to click while authenticated to the portal.

Impact Assessment

Business impact is moderate but non-trivial. Although the CVSS subscores are low for confidentiality (C:L) and integrity (I:L), the scope change (S:C) signals that the flaw crosses a trust boundary, which is often the precondition for more damaging follow-on abuse (for example, using the trusted portal origin to lend credibility to subsequent phishing or credential-harvesting lures). SAP NetWeaver Enterprise Portal is typically an internal-facing enterprise application hub integrating business content and identity — compromising the trust of its rendered pages can erode user confidence and enable targeted social engineering against employees.

Affected systems are deployments of the SAP NetWeaver Enterprise Portal containing the vulnerable component. Blast radius is bounded by the requirement for victim interaction and by the low CIA subscores; however, because the portal often serves as a single sign-on / aggregation point, a successful injection into its trusted context can affect any user who interacts with the crafted link. There is no availability impact, so business continuity is not directly threatened. The absence of a patch, PoC, or KEV listing means the practical risk today is driven by unpatched exposure rather than active exploitation.

Detection Guidance

Sigma Rule

title: Potential SAP NetWeaver Enterprise Portal Open Redirect / Content Injection (CVE-2026-89122)
id: 8f2c1d4a-7b3e-4c9a-9e21-0d5f6a7b8c90
status: experimental
description: Detects HTTP requests containing external URLs in portal navigation parameters, indicative of CWE-601 open redirect / content injection attempts against SAP NetWeaver Enterprise Portal.
references:
  - https://nvd.nist.gov/vuln/detail/CVE-2026-89122
author: Threat Intelligence
date: 2026/01/01
logsource:
  category: webserver
  product: sap
detection:
  selection_method:
    cs-method:
      - 'GET'
      - 'POST'
  selection_redirect:
    cs-uri-query|contains:
      - 'http://'
      - 'https://'
      - '//'
      - 'javascript:'
      - 'data:text/html'
  filter_internal:
    cs-uri-query|contains:
      - 'sap.com'
      - 'localhost'
  condition: selection_method and selection_redirect and not filter_internal
falsepositives:
  - Legitimate portal links that reference approved external SSO or federated identity endpoints.
level: medium
tags:
  - attack.t1189
  - cwe.601

YARA Rule

rule CVE_2026_89122_SAP_Portal_OpenRedirect
{
    meta:
        description = "Detects web logs or captured HTTP requests containing external redirect/injection patterns targeting SAP NetWeaver Enterprise Portal (CVE-2026-89122)"
        author = "Threat Intelligence"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2026-89122"
        date = "2026-01-01"
        cve = "CVE-2026-89122"
    strings:
        $sap = "NetWeaver" nocase
        $portal = "Enterprise Portal" nocase
        $redir_param1 = "redirect=" nocase
        $redir_param2 = "url=" nocase
        $redir_param3 = "returnUrl=" nocase
        $ext_http = "http://" nocase
        $ext_https = "https://" nocase
        $js_scheme = "javascript:" nocase
    condition:
        $sap or $portal and
        (2 of ($redir_param*)) and
        ($ext_http or $ext_https or $js_scheme)
}

Suricata IDS Rule

alert http any any -> any any (msg:"CVE-2026-89122 SAP NetWeaver Enterprise Portal Open Redirect / Content Injection Attempt"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"redirect="; nocase; http.uri; content:"http"; nocase; distance:0; reference:cve,2026-89122; reference:url,nvd.nist.gov/vuln/detail/CVE-2026-89122; classtype:web-application-attack; sid:202689122; rev:1;)

Elastic Detection

sequence by source.ip with maxspan=10s
  [ network where http.method == "GET" and
      stringContains(http.request.uri, "redirect=") and
      (stringContains(http.request.uri, "http://") or stringContains(http.request.uri, "https://")) and
      not stringContains(http.request.uri, "sap.com") ]

Splunk SPL Query

index=web sourcetype=access_combined OR sourcetype=sap:portal
| where match(uri_query, "(?i)(redirect|url|returnUrl)=https?://")
| where NOT match(uri_query, "(?i)sap\.com")
| eval risk="CVE-2026-89122 open redirect / content injection"
| stats count min(_time) as first_seen max(_time) as last_seen by src_ip uri_path uri_query
| where count > 0
| sort - count

Wazuh OSSEC Rule

<group name="web,sap,attack,">
  <rule id="100922" level="10">
    <if_sid>31100</if_sid>
    <match>redirect=|url=|returnUrl=</match>
    <regex>https?://|javascript:</regex>
    <description>CVE-2026-89122: Possible SAP NetWeaver Enterprise Portal open redirect / content injection attempt</description>
    <mitre>
      <id>T1189</id>
    </mitre>
    <group>cve_2026_89122,web_attack,</group>
  </rule>
</group>

Mitigation & Patch Guidance

Patch confidence: 0/4 (UNPATCHED — no patch evidence from any tracked source).

1. Immediate mitigations.

   • Since no vendor patch is available, implement compensating controls at the perimeter: enforce strict allow-listing of redirect/navigation destinations at the reverse proxy or WAF so that only trusted internal origins are permitted in portal navigation parameters.
   • Deploy content security policy (CSP) headers on the portal to restrict which origins may be framed, scripted, or used for navigation, reducing the impact of content injected into the trusted context.
   • Apply outbound and inline content sanitization/validation on any portal component that accepts user-controllable navigation or rendering input.
   • Raise user awareness of phishing links that reference the portal, given the UI:R (victim-click) requirement.

2. Patch / upgrade steps.

   • Monitor SAP Security Notes and the SAP Support Portal for remediation specific to CVE-2026-89122. No fix reference is currently published. Apply vendor patches as soon as they become available and validate the affected component is updated.

3. Long-term hardening.

   • Treat all redirect/navigation inputs as untrusted; adopt a centrally enforced URL validation library that rejects external or scheme-abusing destinations by default.
   • Enforce a strict, origin-binding CSP and same-origin rendering policy for portal content.
   • Add regression tests for open-redirect and content-injection classes to the portal SDLC, and include CWE-601 in secure code review checklists.
   • Continuously monitor for the CVE becoming KEV-listed or for public PoC emergence, which would materially raise urgency.

References

• NVD — CVE-2026-89122: https://nvd.nist.gov/vuln/detail/CVE-2026-89122
• CWE-601: URL Redirection to Untrusted Site (Open Redirect): https://cwe.mitre.org/data/definitions/601.html
• SAP Security Notes / SAP Support Portal (monitor for remediation): https://support.sap.com/en/my-support/knowledge-base/security-notes-news.html
• CISA Known Exploited Vulnerabilities Catalog (currently NOT listed): https://www.cisa.gov/known-exploited-vulnerabilities-catalog
• FIRST EPSS (not yet scored for this CVE): https://www.first.org/epss/

No threat actor campaigns or exploit-in-the-wild evidence are associated with CVE-2026-89122 in the provided data. No public PoC, exploit code, or Nuclei template currently exists.