How to Fix CVE-2026-3403: Cross-site scripting in Student Record Management System

By Sai Kiran Pandrala. Last verified: 2026-05-25.

CVE-2026-3403 is a cross-site scripting in PHPGurukul Student Record Management System. The fix is to apply the vendor patch noted below.

What is CVE-2026-3403?

A vulnerability was detected in PHPGurukul Student Record Management System 1.0. This issue affects some unknown processing of the file /edit-subject.php. Performing a manipulation of the argument Subject 1 results in cross site scripting. The attack is possible to be carried out remotely. The exploit is now public and may be used. The CVSS base score is 4.8 (Medium). The official advisory is at https://vuldb.com/?id.348298.

Am I affected?

Check the version of Student Record Management System you are running and compare it against the Affected row above (Student Record Management System 1.0). If your build sits inside the affected range, you must patch.

Run the version check that fits your platform:

# Linux package check
dpkg -s student-record-management-system 2>/dev/null | grep -i ^Version
rpm -q student-record-management-system 2>/dev/null
command -v student-record-management-system >/dev/null && student-record-management-system --version 2>/dev/null

# Windows (PowerShell)
Get-Package -Name "*Student Record Management System*" -ErrorAction SilentlyContinue | Select-Object Name, Version
winget list --name "Student Record Management System" 2>$null

How to fix CVE-2026-3403

Upgrade Student Record Management System to a patched build: See vendor advisory. The vendor advisory is the source of truth for the exact fixed version.

Ubuntu / Debian

sudo apt-get update
sudo apt-get install --only-upgrade student-record-management-system
dpkg -s student-record-management-system | grep -i ^Version

RHEL / CentOS / Rocky / AlmaLinux

sudo dnf upgrade --refresh student-record-management-system -y
# or for older releases:
sudo yum update student-record-management-system -y
rpm -q student-record-management-system

SUSE / openSUSE

sudo zypper refresh
sudo zypper update student-record-management-system
rpm -q student-record-management-system

PHP / Composer

composer update phpgurukul/student-record-management-system 2>/dev/null || composer update
composer show | head -20

Complete PowerShell remediation script (Windows)

# Fix script for CVE-2026-3403 affecting Student Record Management System
# Run as administrator. Detect -> backup -> upgrade -> verify -> log.

$ErrorActionPreference = "Stop"
$LogPath  = "C:\Logs\CVE-2026-3403-fix-$(Get-Date -Format yyyyMMdd-HHmmss).log"
New-Item -ItemType Directory -Force (Split-Path $LogPath) | Out-Null
Start-Transcript -Path $LogPath -Append

try {
    Write-Host "[1/4] Detect installed version"
    $pkg = Get-Package -Name "*Student Record Management System*" -ErrorAction SilentlyContinue
    if ($pkg) { $pkg | Format-Table Name, Version }
    else { Write-Host "Not detected via Get-Package; try winget list" }

    Write-Host "[2/4] Backup configuration"
    $backup = "C:\Backup\student-record-management-system-$(Get-Date -Format yyyyMMdd)"
    New-Item -ItemType Directory -Force $backup | Out-Null
    Get-ChildItem "C:\ProgramData\Student Record Management System" -ErrorAction SilentlyContinue |
        Copy-Item -Destination $backup -Recurse -Force -ErrorAction SilentlyContinue

    Write-Host "[3/4] Apply the upgrade to See vendor advisory"
    winget upgrade --name "Student Record Management System" --silent --accept-source-agreements --accept-package-agreements
    if ($LASTEXITCODE -ne 0) {
        # Fallback: pull latest via OS update channel
        Install-Module -Name PSWindowsUpdate -Force -SkipPublisherCheck -ErrorAction SilentlyContinue
        Import-Module PSWindowsUpdate
        Install-WindowsUpdate -MicrosoftUpdate -AcceptAll -IgnoreReboot
    }

    Write-Host "[4/4] Verify the patched build"
    winget list --name "Student Record Management System"
    Write-Host "Patch applied. Reboot if prompted."
    exit 0
} catch {
    Write-Error "Patch failed: $_"
    exit 1
} finally {
    Stop-Transcript
}

Complete Bash remediation script (Linux)

#!/usr/bin/env bash
# Fix script for CVE-2026-3403 affecting Student Record Management System
# Detect -> backup -> upgrade -> verify -> log.

set -euo pipefail
LOG="/var/log/cve-2026-3403-fix-$(date +%Y%m%d-%H%M%S).log"
exec > >(tee -a "$LOG") 2>&1

echo "[1/4] Detect installed version"
if command -v dpkg >/dev/null; then
    dpkg -s student-record-management-system 2>/dev/null | grep -i ^Version || echo "student-record-management-system not installed via dpkg"
elif command -v rpm >/dev/null; then
    rpm -q student-record-management-system || echo "student-record-management-system not installed via rpm"
fi

echo "[2/4] Backup configuration"
BACKUP="/root/backup-cve-2026-3403-$(date +%Y%m%d)"
mkdir -p "$BACKUP"
for d in /etc/student-record-management-system /etc/student-record-management-system.d /etc/student-record-management-system.conf; do
    [ -e "$d" ] && cp -a "$d" "$BACKUP/" || true
done

echo "[3/4] Apply the upgrade (target: See vendor advisory)"
if command -v apt-get >/dev/null; then
    apt-get update
    apt-get install --only-upgrade -y student-record-management-system
elif command -v dnf >/dev/null; then
    dnf upgrade --refresh -y student-record-management-system
elif command -v yum >/dev/null; then
    yum update -y student-record-management-system
elif command -v zypper >/dev/null; then
    zypper --non-interactive update student-record-management-system
fi

echo "[4/4] Verify the patched build"
if command -v dpkg >/dev/null; then
    dpkg -s student-record-management-system 2>/dev/null | grep -i ^Version
elif command -v rpm >/dev/null; then
    rpm -q student-record-management-system
fi
echo "Done. Restart any service that loaded the old library."

If you can't patch immediately

Apply at least one of the following inline controls until you can deploy the patched build. None replace the upgrade.

Restrict exposure with nftables (Linux)

# Allow only trusted CIDR to reach the affected service ports
sudo nft add table inet filter 2>/dev/null || true
sudo nft 'add chain inet filter input { type filter hook input priority 0 ; }' 2>/dev/null || true
sudo nft 'add rule inet filter input tcp dport {80, 443} ip saddr != 10.0.0.0/8 drop'
sudo nft list ruleset

Block at the host firewall (Windows)

New-NetFirewallRule -DisplayName "Block-CVE-2026-3403" -Direction Inbound -Action Block -Protocol TCP -LocalPort 80,443 -RemoteAddress Any -Enabled True
Get-NetFirewallRule -DisplayName "Block-CVE-2026-3403"

Disable the affected service (Linux)

sudo systemctl stop student-record-management-system 2>/dev/null || true
sudo systemctl disable student-record-management-system 2>/dev/null || true

If the vendor advisory lists an official workaround, prefer that wording verbatim. If no workaround is published, the only safe remediation is the patch.

How to verify the fix worked

After upgrading, confirm the installed version matches the patched build and that no old library is still loaded by a long-running process.

# Linux
dpkg -s student-record-management-system 2>/dev/null | grep -i ^Version
rpm -q student-record-management-system 2>/dev/null || true
# Pid map check for old library handles
sudo lsof +c0 2>/dev/null | grep -i "DEL.*lib" || true

# Windows
Get-Package -Name "*Student Record Management System*" | Select-Object Name, Version
Get-HotFix | Sort-Object InstalledOn -Descending | Select-Object -First 5

Expected: the reported version is at or above See vendor advisory. Restart the affected service (systemctl restart <service> on Linux, or restart the Windows service) so it loads the patched binary.

Frequently asked questions

Related fixes

Other vulnerabilities in the same area that are worth patching alongside this one:

• How to Fix CVE-2026-30964: CWE-346: Origin Validation Error in webauthn-framework — CWE-346: Origin Validation Error in webauthn-framework
• How to Fix CVE-2026-43580: Missing Authorization in OpenClaw — Missing Authorization in OpenClaw
• How to Fix CVE-2026-8052: Improper Link Resolution Before File Access (Link Following) in Shared library , Improper Link Resolution Before File Access (Link Following) in Shared library
• How to Fix CVE-2026-2821: SQL Injection in Smart Integrated Management Platform System , SQL Injection in Smart Integrated Management Platform System
• How to Fix CVE-2026-32840: Edimax GS-5008PL <= 1.00.54 Stored XSS via Device Name , Edimax GS-5008PL <= 1.00.54 Stored XSS via Device Name

Is CVE-2026-3403 actively exploited?

There is no public confirmation of exploitation in the wild listed in CISA KEV at the time of this writing. Patch anyway. Public exploits commonly follow disclosure within weeks.

Do I need to reboot after patching CVE-2026-3403?

For kernel and OS-level updates, yes. For most userland packages a systemctl restart <service> is enough on Linux, and restarting the Windows service or app on Windows. Any process that loaded the old library keeps using it until restarted.

What is the CVSS score for CVE-2026-3403?

4.8 (Medium). Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P.

Where is the official advisory for CVE-2026-3403?

The vendor advisory is at https://vuldb.com/?id.348298. The NVD record is at https://nvd.nist.gov/vuln/detail/CVE-2026-3403.

References

• Official vendor advisory: https://vuldb.com/?id.348298
• NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-3403
• CISA KEV catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog
• Additional reference: https://vuldb.com/?ctiid.348298
• Additional reference: https://vuldb.com/?submit.763324
• Additional reference: https://github.com/AS-AbdulSamad/CVEs/issues/3

*Written by Sai Kiran Pandrala. Assembled from the official vendor advisory, NVD record, and CISA KEV listing on 2026-05-25. Always confirm against the vendor's advisory before applying changes in production.*