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CVE.org (no NVD analysis yet)· CNA WSO2

CVE-2026-11854: Cross-Site Scripting via Authentication Endpoint Error Message in Multiple WSO2 Products

Noroxi assessment

Priority: Monitor (action score 24/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.21% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • According to the record, no fixed version is available yet.

Low priority for now. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

The authentication endpoint generates an error message that includes reflected data directly from the request without sufficient sanitization or encoding. This allows an attacker to inject malicious scripts that can be executed in the context of a victim's browser. Successful exploitation enables an attacker to perform actions within the user's browser, such as redirecting the user to a malicious website, modifying the web page's user interface, or retrieving information. However, due to the httpOnly flag on session-related cookies, session hijacking or similar attacks are not possible.

MediumCVSS 6.1 · v3.1—No exploit No fix recorded
Published
Oct 28, 2026
Updated
Oct 29, 2026
EPSS
0.2% · 11th percentile

Report tools

JSON

Action score

24

Monitor

Low priority for now.

CVSS
24 / 40 · 6.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · WSO2
6.1
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-11854

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Limit the impact of XSS

This is a cross-site scripting (XSS) vulnerability. A well-configured Content-Security-Policy doesn't fix it, but greatly reduces its impact. Check your site's CSP and other security headers for free.

Check security headers

Versions reported by the vendor

Affected version ranges reported by the assigning authority (WSO2). Independent of NVD's CPE analysis and usually ahead of it.

  • WSO2 WSO2 API Control Plane

    • before 4.5.0unknown
    • 4.5.0 and later · before 4.5.0.66affected
    • 4.6.0 and later · before 4.6.0.30affected
    • 4.7.0 and later · before 4.7.0.1affected

  • WSO2 WSO2 API Manager

    • before 3.2.0unknown
    • 3.2.0 and later · before 3.2.0.480affected
    • 3.2.1 and later · before 3.2.1.99affected
    • 4.1.0 and later · before 4.1.0.265affected
    • 4.2.0 and later · before 4.2.0.205affected
    • 4.3.0 and later · before 4.3.0.117affected
    • 4.4.0 and later · before 4.4.0.80affected
    • 4.5.0 and later · before 4.5.0.65affected
    • 4.6.0 and later · before 4.6.0.29affected
    • 4.7.0 and later · before 4.7.0.1affected

  • WSO2 WSO2 Identity Server

    • before 5.10.0unknown
    • 5.10.0 and later · before 5.10.0.399affected
    • 5.11.0 and later · before 5.11.0.446affected
    • 6.0.0 and later · before 6.0.0.272affected
    • 6.1.0 and later · before 6.1.0.274affected
    • 7.0.0 and later · before 7.0.0.155affected
    • 7.1.0 and later · before 7.1.0.65affected
    • 7.2.0 and later · before 7.2.0.26affected

Same product

wso2: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-4052Privilege Escalation via Token Endpoint in WSO2 API Manager (APIM 4.x/IS as Resident Key Manager)
    39Monitor
  • CVE-2025-11969Broken Access Control via System REST APIs in Multiple WSO2 Products Allows Unauthorized Administrative Actions
    37Monitor
  • CVE-2025-14561Access Control Bypass via Publisher REST APIs in Multiple WSO2 Products Allows Cross-Tenant Operations
    36Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2024-7478Oct 21, 2026 · Username Enumeration via External User Stores in Multiple WSO2 Products Allows User Account Discovery
    23Monitor
  • ← EarlierCVE-2025-14260Oct 28, 2026 · Server Side Request Forgery in Multiple WSO2 Products Allows Access to Internal and External Resources
    33Monitor
  • Later →CVE-2026-3583Oct 28, 2026 · Improper Token Revocation via OAuth2 Scope Enforcement in Multiple WSO2 Products [Disrupted Authentication Flows]
    12Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2025-125445 days apartStored Cross-Site Scripting in Multiple WSO2 Products
    19Monitor
  • CVE-2025-66239 days apartStored Cross-Site Scripting via XML Input in Multiple WSO2 Products Allows UI Manipulation and Redirection
    17Monitor
  • CVE-2025-650883 days apartUser Interface Misrepresentation via Swagger UI Try-out Console in WSO2 API Manager Allows Sensitive Information Exposure or Unintended Requests
    17Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
low · data or configuration can be modified
Availability
none

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality impact
Low
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

nvd-secondary

Root cause

User content is inserted into the page as HTML. The browser interprets the content as code rather than data.

The bug in code

The whole CWE-79 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
commentEl.innerHTML = comment.body;

Fixed

ts
commentEl.textContent = comment.body;

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. SSVC exploitation— → none
  2. Exploit maturity— → none

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records