Is this vulnerability remotely exploitable?

Yes. Any remote attacker who can obtain an account with document upload permissions, or compromise such an account, can upload a malicious HTML file. Other users who open the shared link to that file while logged in will execute the attacker's script in their browser.

What level of access does an attacker need to exploit this?

The attacker needs upload permissions within the "Initiatives" section. They do not necessarily need administrative access; a standard user role that can upload documents is sufficient to plant the payload.

What is the safest general fix pattern for this issue?

The most robust fix is to prevent active HTML content from being treated as a normal document: disallow `.html`/`.htm` uploads by default, or, if business requirements demand HTML uploads, host them on a separate, unprivileged origin and/or render them inside strongly sandboxed containers so that scripts cannot access the main application context.

Severity:

HIGH RISK

(8.7)

Stored Cross-Site Scripting via Unsandboxed HTML Uploads (CWE-79) in Initiative Project Management Platform

CVE-2026-28274

Published:

Feb 26, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-78

CRITICAL RISK

CRITICAL

(9.9)

Command Injection in MCP Stdio Configuration Validation (CWE-78) in WeKnora

Remote Code Execution

March 7, 2026

CWE-89

CRITICAL RISK

CRITICAL

(9.9)

SQL Injection via PostgreSQL Array/Row Expressions (CWE-89) in WeKnora Query Engine

Remote Code Execution via SQL Injection on the Database Server

March 7, 2026

Vulnerability Type

Category:

Stored Cross-Site Scripting (XSS)

CWE:

CWE-79;CWE-434

Impact:

Session Hijacking and Sensitive Data Exfiltration via Stored XSS

Severity:

HIGH RISK

(8.7)

CVSS Version:

3.1

Vulnerability Type

Category:

Stored Cross-Site Scripting (XSS)

CWE:

CWE-79;CWE-434

Impact:

Session Hijacking and Sensitive Data Exfiltration via Stored XSS

Severity:

HIGH RISK

(8.7)

CVSS Version:

3.1

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355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Stored Cross-Site Scripting via Unsandboxed HTML Uploads (CWE-79) in Initiative Project Management Platform

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

CRITICAL RISK

CRITICAL

(9.9)

Command Injection in MCP Stdio Configuration Validation (CWE-78) in WeKnora

CRITICAL RISK

CRITICAL

(9.9)

SQL Injection via PostgreSQL Array/Row Expressions (CWE-89) in WeKnora Query Engine

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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