How to Fix CVE-2026-3075: Exposure of sensitive system information to an unauthorized control sphere in Simple Ajax Chat

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

CVE-2026-3075 is a exposure of sensitive system information to an unauthorized control sphere in Jeff Starr Simple Ajax Chat. The fix is to upgrade to Simple Ajax Chat 20260217.

What is CVE-2026-3075?

Exposure of Sensitive System Information to an Unauthorized Control Sphere vulnerability in Jeff Starr Simple Ajax Chat simple-ajax-chat allows Retrieve Embedded Sensitive Data.This issue affects Simple Ajax Chat: from n/a through <= 20251121. The CVSS base score is 5.3 (Medium). The official advisory is at https://patchstack.com/database/Wordpress/Plugin/simple-ajax-chat/vulnerability/wordpress-simple-ajax-chat-plugin-20251121-sensitive-data-exposure-vulnerability?_s_id=cve.

Am I affected?

Check the version of Simple Ajax Chat you are running and compare it against the Affected row above (Simple Ajax Chat 0 to <=20251121). If your build sits inside the affected range, you must patch.

Run the version check that fits your platform:

# Linux package check
dpkg -s simple-ajax-chat 2>/dev/null | grep -i ^Version
rpm -q simple-ajax-chat 2>/dev/null
command -v simple-ajax-chat >/dev/null && simple-ajax-chat --version 2>/dev/null

# Windows (PowerShell)
Get-Package -Name "*Simple Ajax Chat*" -ErrorAction SilentlyContinue | Select-Object Name, Version
winget list --name "Simple Ajax Chat" 2>$null

How to fix CVE-2026-3075

Upgrade Simple Ajax Chat to a patched build: Simple Ajax Chat 20260217. 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 simple-ajax-chat
dpkg -s simple-ajax-chat | grep -i ^Version

RHEL / CentOS / Rocky / AlmaLinux

sudo dnf upgrade --refresh simple-ajax-chat -y
# or for older releases:
sudo yum update simple-ajax-chat -y
rpm -q simple-ajax-chat

SUSE / openSUSE

sudo zypper refresh
sudo zypper update simple-ajax-chat
rpm -q simple-ajax-chat

Node.js / npm

# Update the affected package in your project
npm install Simple Ajax Chat@latest
npm ls Simple Ajax Chat
npm audit fix

Complete PowerShell remediation script (Windows)

# Fix script for CVE-2026-3075 affecting Simple Ajax Chat
# Run as administrator. Detect -> backup -> upgrade -> verify -> log.

$ErrorActionPreference = "Stop"
$LogPath  = "C:\Logs\CVE-2026-3075-fix-$(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"
    $pkg = Get-Package -Name "*Simple Ajax Chat*" -ErrorAction SilentlyContinue
    if ($pkg) { $pkg | Format-Table Name, Version }
    else { Write-Host "Not detected via Get-Package; try winget list" }

    Write-Host "[2/4] Backup configuration"
    $backup = "C:\Backup\simple-ajax-chat-$(Get-Date -Format yyyyMMdd)"
    New-Item -ItemType Directory -Force $backup | Out-Null
    Get-ChildItem "C:\ProgramData\Simple Ajax Chat" -ErrorAction SilentlyContinue |
        Copy-Item -Destination $backup -Recurse -Force -ErrorAction SilentlyContinue

    Write-Host "[3/4] Apply the upgrade to Simple Ajax Chat 20260217"
    winget upgrade --name "Simple Ajax Chat" --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 "Simple Ajax Chat"
    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-2026-3075 affecting Simple Ajax Chat
# Detect -> backup -> upgrade -> verify -> log.

set -euo pipefail
LOG="/var/log/cve-2026-3075-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 simple-ajax-chat 2>/dev/null | grep -i ^Version || echo "simple-ajax-chat not installed via dpkg"
elif command -v rpm >/dev/null; then
    rpm -q simple-ajax-chat || echo "simple-ajax-chat not installed via rpm"
fi

echo "[2/4] Backup configuration"
BACKUP="/root/backup-cve-2026-3075-$(date +%Y%m%d)"
mkdir -p "$BACKUP"
for d in /etc/simple-ajax-chat /etc/simple-ajax-chat.d /etc/simple-ajax-chat.conf; do
    [ -e "$d" ] && cp -a "$d" "$BACKUP/" || true
done

echo "[3/4] Apply the upgrade (target: Simple Ajax Chat 20260217)"
if command -v apt-get >/dev/null; then
    apt-get update
    apt-get install --only-upgrade -y simple-ajax-chat
elif command -v dnf >/dev/null; then
    dnf upgrade --refresh -y simple-ajax-chat
elif command -v yum >/dev/null; then
    yum update -y simple-ajax-chat
elif command -v zypper >/dev/null; then
    zypper --non-interactive update simple-ajax-chat
fi

echo "[4/4] Verify the patched build"
if command -v dpkg >/dev/null; then
    dpkg -s simple-ajax-chat 2>/dev/null | grep -i ^Version
elif command -v rpm >/dev/null; then
    rpm -q simple-ajax-chat
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-2026-3075" -Direction Inbound -Action Block -Protocol TCP -LocalPort 80,443 -RemoteAddress Any -Enabled True
Get-NetFirewallRule -DisplayName "Block-CVE-2026-3075"

Disable the affected service (Linux)

sudo systemctl stop simple-ajax-chat 2>/dev/null || true
sudo systemctl disable simple-ajax-chat 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 simple-ajax-chat 2>/dev/null | grep -i ^Version
rpm -q simple-ajax-chat 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 "*Simple Ajax Chat*" | Select-Object Name, Version
Get-HotFix | Sort-Object InstalledOn -Descending | Select-Object -First 5

Expected: the reported version is at or above Simple Ajax Chat 20260217. 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-2026-40068: Improper Input Validation in claude-code — Improper Input Validation in claude-code
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• How to Fix CVE-2026-40797: Improper Neutralization of Special Elements used in an SQL Command ('SQL Injecti , Improper Neutralization of Special Elements used in an SQL Command ('SQL Injecti
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Is CVE-2026-3075 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-2026-3075?

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-2026-3075?

5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Where is the official advisory for CVE-2026-3075?

The vendor advisory is at https://patchstack.com/database/Wordpress/Plugin/simple-ajax-chat/vulnerability/wordpress-simple-ajax-chat-plugin-20251121-sensitive-data-exposure-vulnerability?_s_id=cve. The NVD record is at https://nvd.nist.gov/vuln/detail/CVE-2026-3075.

References

• Official vendor advisory: https://patchstack.com/database/Wordpress/Plugin/simple-ajax-chat/vulnerability/wordpress-simple-ajax-chat-plugin-20251121-sensitive-data-exposure-vulnerability?_s_id=cve
• NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-3075
• CISA KEV catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

*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.*