⚠ Reference material — not professional advice. Test in staging, back up first, verify against your specific version. Use your own judgment for your environment.
● Medium · CVSS 6

How to Fix CVE-2026-0689: Weak credential storage in ExtremeCloud IQ - Site Engine

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

CVE-2026-0689 is a weak credential storage in Extreme Networks ExtremeCloud IQ - Site Engine. The fix is to upgrade to ExtremeCloud IQ - Site Engine 26.02.11.

⚡ At a glance
Severity6 (Medium)
Actively exploited?No public listing in CISA KEV
AffectedExtremeCloud IQ - Site Engine 25.5.12.6 to <=<=25.12.11
Fixed inExtremeCloud IQ - Site Engine 26.02.11
Type (CWE)CWE-522 Insufficiently Protected Credentials

What is CVE-2026-0689?

In ExtremeCloud IQ – Site Engine (XIQ‑SE) before 26.2.10, a vulnerability in the NAC administration interface allows an authenticated NAC administrator to retrieve masked sensitive parameters from HTTP responses. Although credentials appear redacted in the user interface, the application returns the underlying credential values in the HTTP response, enabling an authorized administrator to recover stored secrets that may exceed their intended access.

We would like to thank the Lockheed Martin Red Team for responsibly reporting this issue and working with us through coordinated disclosure. The CVSS base score is 6 (Medium). The official advisory is at https://extreme-networks.my.site.com/ExtrArticleDetail?an=000134325.

Am I affected?

Check the version of ExtremeCloud IQ - Site Engine you are running and compare it against the Affected row above (ExtremeCloud IQ - Site Engine 25.5.12.6 to <=<=25.12.11). If your build sits inside the affected range, you must patch.

Run the version check that fits your platform:


# Linux package check
dpkg -s extremecloud-iq---site-engine 2>/dev/null | grep -i ^Version
rpm -q extremecloud-iq---site-engine 2>/dev/null
command -v extremecloud-iq---site-engine >/dev/null && extremecloud-iq---site-engine --version 2>/dev/null


# Windows (PowerShell)
Get-Package -Name "*ExtremeCloud IQ - Site Engine*" -ErrorAction SilentlyContinue | Select-Object Name, Version
winget list --name "ExtremeCloud IQ - Site Engine" 2>$null

How to fix CVE-2026-0689

Upgrade ExtremeCloud IQ - Site Engine to a patched build: ExtremeCloud IQ - Site Engine 26.02.11. 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 extremecloud-iq---site-engine
dpkg -s extremecloud-iq---site-engine | grep -i ^Version

RHEL / CentOS / Rocky / AlmaLinux


sudo dnf upgrade --refresh extremecloud-iq---site-engine -y
# or for older releases:
sudo yum update extremecloud-iq---site-engine -y
rpm -q extremecloud-iq---site-engine

SUSE / openSUSE


sudo zypper refresh
sudo zypper update extremecloud-iq---site-engine
rpm -q extremecloud-iq---site-engine

Complete PowerShell remediation script (Windows)


# Fix script for CVE-2026-0689 affecting ExtremeCloud IQ - Site Engine
# Run as administrator. Detect -> backup -> upgrade -> verify -> log.

$ErrorActionPreference = "Stop"
$LogPath  = "C:\Logs\CVE-2026-0689-fix-$(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"
    $pkg = Get-Package -Name "*ExtremeCloud IQ - Site Engine*" -ErrorAction SilentlyContinue
    if ($pkg) { $pkg | Format-Table Name, Version }
    else { Write-Host "Not detected via Get-Package; try winget list" }

    Write-Host "[2/4] Backup configuration"
    $backup = "C:\Backup\extremecloud-iq---site-engine-$(Get-Date -Format yyyyMMdd)"
    New-Item -ItemType Directory -Force $backup | Out-Null
    Get-ChildItem "C:\ProgramData\ExtremeCloud IQ - Site Engine" -ErrorAction SilentlyContinue |
        Copy-Item -Destination $backup -Recurse -Force -ErrorAction SilentlyContinue

    Write-Host "[3/4] Apply the upgrade to ExtremeCloud IQ - Site Engine 26.02.11"
    winget upgrade --name "ExtremeCloud IQ - Site Engine" --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 "ExtremeCloud IQ - Site Engine"
    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-2026-0689 affecting ExtremeCloud IQ - Site Engine
# Detect -> backup -> upgrade -> verify -> log.

set -euo pipefail
LOG="/var/log/cve-2026-0689-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 extremecloud-iq---site-engine 2>/dev/null | grep -i ^Version || echo "extremecloud-iq---site-engine not installed via dpkg"
elif command -v rpm >/dev/null; then
    rpm -q extremecloud-iq---site-engine || echo "extremecloud-iq---site-engine not installed via rpm"
fi

echo "[2/4] Backup configuration"
BACKUP="/root/backup-cve-2026-0689-$(date +%Y%m%d)"
mkdir -p "$BACKUP"
for d in /etc/extremecloud-iq---site-engine /etc/extremecloud-iq---site-engine.d /etc/extremecloud-iq---site-engine.conf; do
    [ -e "$d" ] && cp -a "$d" "$BACKUP/" || true
done

echo "[3/4] Apply the upgrade (target: ExtremeCloud IQ - Site Engine 26.02.11)"
if command -v apt-get >/dev/null; then
    apt-get update
    apt-get install --only-upgrade -y extremecloud-iq---site-engine
elif command -v dnf >/dev/null; then
    dnf upgrade --refresh -y extremecloud-iq---site-engine
elif command -v yum >/dev/null; then
    yum update -y extremecloud-iq---site-engine
elif command -v zypper >/dev/null; then
    zypper --non-interactive update extremecloud-iq---site-engine
fi

echo "[4/4] Verify the patched build"
if command -v dpkg >/dev/null; then
    dpkg -s extremecloud-iq---site-engine 2>/dev/null | grep -i ^Version
elif command -v rpm >/dev/null; then
    rpm -q extremecloud-iq---site-engine
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-2026-0689" -Direction Inbound -Action Block -Protocol TCP -LocalPort 80,443 -RemoteAddress Any -Enabled True
Get-NetFirewallRule -DisplayName "Block-CVE-2026-0689"

Disable the affected service (Linux)


sudo systemctl stop extremecloud-iq---site-engine 2>/dev/null || true
sudo systemctl disable extremecloud-iq---site-engine 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 extremecloud-iq---site-engine 2>/dev/null | grep -i ^Version
rpm -q extremecloud-iq---site-engine 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 "*ExtremeCloud IQ - Site Engine*" | Select-Object Name, Version
Get-HotFix | Sort-Object InstalledOn -Descending | Select-Object -First 5

Expected: the reported version is at or above ExtremeCloud IQ - Site Engine 26.02.11. Restart the affected service (systemctl restart <service> on Linux, or restart the Windows service) so it loads the patched binary.

Frequently asked questions

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

Is CVE-2026-0689 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-2026-0689?

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-2026-0689?

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

Where is the official advisory for CVE-2026-0689?

The vendor advisory is at https://extreme-networks.my.site.com/ExtrArticleDetail?an=000134325. The NVD record is at https://nvd.nist.gov/vuln/detail/CVE-2026-0689.

References

*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.*