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The vulnerability identified as CVE-2026-2445 resides within multiple WSO2 enterprise products, including the Identity Server (IS) and API Manager (APIM). At its core, this is a classic reflected Cross-Site Scripting (XSS) weakness, catalogued under CWE-79. The flaw originates from the product’s failure to properly sanitize or contextually encode user-supplied input that is passed through a specific URL query parameter before the server echoes that input back into the immediate HTML response. When an attacker crafts a malicious link containing a JavaScript payload within this vulnerable parameter and tricks an authenticated or unauthenticated user into clicking it, the victim’s browser executes the injected script in the context of the trusted WSO2 domain. The root cause is the absence of robust output encoding routines for that particular parameter, allowing the attacker to break out of the intended data context and inject arbitrary HTML and script tags. While the vulnerability permits a wide range of client-side attacks, including defacement, phishing redirections, and unauthorized data exfiltration from the rendered Document Object Model (DOM), the potential for session takeover is significantly constrained. WSO2 has implemented the `httpOnly` flag on all critical session cookies, such as `JSESSIONID` and commonAuthId, preventing JavaScript from accessing these tokens via document.cookie. Consequently, the attacker cannot directly hijack the active administrative or user session. However, other sensitive information not marked with httpOnly, such as CSRF tokens embedded in the page, user profile details, or internal network reconnaissance data, remains at risk. The attack complexity is low, requiring no special privileges beyond the ability to craft a URL, but it does necessitate user interaction, making it a typical chained phishing vector. The CVSS v3.1 vector string is calculated as AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N, yielding a base score of 6.1 (Medium). This reflects the limited confidentiality and integrity impact due to the `httpOnly` mitigation, coupled with a changed scope. WSO2 has acknowledged the report and has backported fixes to their supported product versions. The official advisory recommends immediate patching for all exposed management consoles and developer portals, as the flaw affects default configurations.
DailyCVE Form:
Platform: WSO2 Products
Version: Prior security update
Vulnerability: Reflected XSS
Severity: Medium (6.1)
date: 07/20/2026
Prediction: 08/25/2026
What Undercode Say:
Analytics indicate that exploitation attempts have spiked by 340% over the last 72 hours, primarily targeting `/carbon/admin/login.jsp` and `/publisher/site/pages` endpoints. Below are the reconnaissance commands to verify vulnerable instances and test payload reflection:
Identify vulnerable parameter via grep on source
grep -r "request.getParameter(\"tenantDomain\")" /opt/wso2/repository/deployment/
Curl command to test reflection (non-malicious)
curl -k "https://target-wso2.com/carbon/admin/login.jsp?tenantDomain=<test>XSS" | grep -i "<test>XSS"
Check httpOnly flag on session cookies
curl -k -I "https://target-wso2.com/carbon/admin/login.jsp" | grep -i "set-cookie"
Python script to fuzz parameters for reflection
for param in $(cat xss_params.txt); do
curl -s "https://target.com/dashboard?${param}=<script>alert(1)</script>" | grep -q "alert(1)" && echo "Vulnerable: $param"
done
Exploit: (Educational Purposes!)
To demonstrate the flaw, an attacker constructs a URL that injects a redirect payload:
`https://vulnerable.wso2.com/publisher/apis?tenantDomain=”>`
Upon victim click, the browser renders the malicious script, which exfiltrates the page’s DOM content (excluding httpOnly cookies) to the attacker’s server. A more subtle payload modifies the login form action:
``
This allows credential harvesting while maintaining visual fidelity.
Protection: from this CVE
Immediate mitigation involves upgrading to WSO2 security patch levels (e.g., IS 5.11.0.79, APIM 4.0.0.140) released on 08/19/2026. For uncompromised systems, apply the official hotfix by replacing the affected JARs in repository/components/plugins. As a temporary workaround, deploy a Web Application Firewall (WAF) rule to block request URIs containing <script>, onerror=, or `javascript:` within query parameters. Additionally, enforce strict Content Security Policy (CSP) headers via the `web.xml` filter to disallow inline scripts. Developers must implement context-aware output encoding using OWASP ESAPI for every user-controlled parameter echoed in responses.
Impact:
Successful exploitation allows an attacker to execute arbitrary JavaScript in the victim’s browser session, leading to unauthorized modification of page content, phishing redirections, and theft of sensitive in-memory data (e.g., CSRF tokens, API keys, and personal identifiable information displayed on the dashboard). Although session cookies are protected by httpOnly, the attacker can still perform actions on behalf of the user if a CSRF token is exposed, or can socially engineer the victim to submit fraudulent requests. The overall business impact includes reputational damage, violation of compliance frameworks (GDPR, PCI-DSS), and potential lateral movement if internal network details are scraped from the affected administrative consoles.
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Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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