CVE-2026-11491: CodeAstro HRMS Stored XSS Vulnerability

CVE-2026-11491 Overview

CVE-2026-11491 is a stored cross-site scripting (XSS) vulnerability in CodeAstro Human Resource Management System 1.0. The flaw resides in the Notice Board Management component, specifically in the /notice/All_notice endpoint. An authenticated attacker can submit a crafted payload through the Notice Title parameter in a POST request, which is then persisted and rendered without proper output encoding. The issue is tracked under CWE-79 and a public proof of concept is referenced in the GitHub CVE-2026-11491 Repository.

Critical Impact
Stored XSS in the Notice Board allows persistent script execution in the browser of any user viewing the affected notice, enabling session theft, UI manipulation, or phishing redirects.

Affected Products

CodeAstro Human Resource Management System 1.0
Notice Board Management component (/notice/All_notice)
Deployments exposing the HRMS web interface to authenticated users

Discovery Timeline

2026-06-08 - CVE-2026-11491 published to NVD
2026-06-08 - Last updated in NVD database

Technical Details for CVE-2026-11491

Vulnerability Analysis

The vulnerability is a stored XSS issue in the Notice Board Management feature of CodeAstro HRMS 1.0. The application accepts user-supplied input in the Notice Title field of a POST request to /notice/All_notice and stores it without sanitization or context-aware output encoding. When other authenticated users load the notice list, the malicious markup executes in their browser session. The publicly documented payload <svg onload="alert('Stored XSS Triggered by Ashik Mohamed')"> confirms HTML and JavaScript injection through standard DOM event handlers.

Root Cause

The root cause is missing input validation and missing output encoding on the Notice Title parameter. The application trusts authenticated input and renders stored content directly into the HTML response. Because the value is persisted in the database, the payload re-triggers for every viewer of the notice board, making the issue a stored rather than reflected XSS condition.

Attack Vector

The attack vector is network-based and requires high privileges with user interaction, since the attacker must be authenticated to post a notice and a second user must visit the notice board. After injection, the payload executes in the victim's browser under the application's origin. Attackers can steal session cookies that are not marked HttpOnly, perform actions on behalf of victims through CSRF-like requests, or redirect users to credential-harvesting pages. No verified exploitation code beyond the public PoC payload is required.

Detection Methods for CVE-2026-11491

Indicators of Compromise

Notice records in the HRMS database where the Notice Title column contains HTML tags such as <svg, <script, <img, or DOM event handlers like onload=, onerror=, or onclick=.
Web server access logs showing POST requests to /notice/All_notice with body parameters containing URL-encoded angle brackets (%3C, %3E) or javascript: schemes.
Browser console errors or unexpected outbound requests from HRMS pages to attacker-controlled domains.

Detection Strategies

Implement web application firewall (WAF) rules that inspect POST bodies sent to /notice/All_notice for HTML tag patterns and JavaScript event handlers.
Run scheduled database queries against the notices table to flag stored values containing <, >, or on*= substrings for analyst review.
Review authentication logs to correlate notice creation events with low-privilege or newly created accounts that should not normally post notices.

Monitoring Recommendations

Forward HRMS web and application logs to a central analytics platform and alert on anomalous POST volume to notice endpoints.
Monitor outbound HTTP requests from HRMS user sessions to identify exfiltration triggered by injected scripts.
Track Content Security Policy (CSP) violation reports if CSP is enabled in report-only or enforcing mode.

How to Mitigate CVE-2026-11491

Immediate Actions Required

Restrict access to the Notice Board creation function to trusted HR administrators until a fix is applied.
Audit existing notices and purge any records containing HTML or script content.
Rotate session cookies and force re-authentication for users who viewed the notice board during the exposure window.

Patch Information

No vendor patch is currently referenced in the NVD entry. Consult the CodeAstro Security Resource and the VulDB CVE-2026-11491 Details page for vendor updates. Until a patch is released, apply the workarounds below and implement compensating controls at the web application layer.

Workarounds

Apply server-side input validation on the Notice Title field to reject any characters outside an allow-list of letters, digits, and a small set of punctuation.
Enforce context-aware output encoding when rendering notice content, encoding <, >, ", ', and & before insertion into HTML.
Deploy a strict Content Security Policy that disallows inline scripts and restricts script sources to trusted origins.
Set the HttpOnly and Secure flags on session cookies to limit the impact of script execution.

bash

# Example WAF rule (ModSecurity) blocking script-like payloads in Notice Title
SecRule REQUEST_URI "@streq /notice/All_notice" \
  "phase:2,chain,deny,status:403,id:1026114910,msg:'Potential XSS in Notice Title'"
  SecRule ARGS:Notice_Title "@rx (?i)(<\s*(script|svg|img|iframe)|on\w+\s*=|javascript:)" \
    "t:none,t:urlDecodeUni"