⚠ 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 6.4

How to Fix CVE-2026-2029: Cross-site scripting in Livemesh Addons for Beaver Builder

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

CVE-2026-2029 is a cross-site scripting in livemesh Livemesh Addons for Beaver Builder. The fix is to apply the vendor patch noted below.

⚡ At a glance
Severity6.4 (Medium)
Actively exploited?No public listing in CISA KEV
AffectedLivemesh Addons for Beaver Builder 0 to <=3.9.2
Fixed inSee vendor advisory
Type (CWE)CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

What is CVE-2026-2029?

The Livemesh Addons for Beaver Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the [labb_pricing_item] shortcode's title and value attributes in all versions up to, and including, 3.9.2 due to insufficient input sanitization and output escaping. Specifically, the plugin uses htmlspecialchars_decode() after wp_kses_post(), which decodes HTML entities back into executable code after sanitization has occurred. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The CVSS base score is 6.4 (Medium). The official advisory is at https://www.wordfence.com/threat-intel/vulnerabilities/id/8bc96b4f-256e-491b-9d27-de1adbf67643?source=cve.

Am I affected?

Check the version of Livemesh Addons for Beaver Builder you are running and compare it against the Affected row above (Livemesh Addons for Beaver Builder 0 to <=3.9.2). If your build sits inside the affected range, you must patch.

Run the version check that fits your platform:


# Linux package check
dpkg -s livemesh-addons-for-beaver-builder 2>/dev/null | grep -i ^Version
rpm -q livemesh-addons-for-beaver-builder 2>/dev/null
command -v livemesh-addons-for-beaver-builder >/dev/null && livemesh-addons-for-beaver-builder --version 2>/dev/null


# Windows (PowerShell)
Get-Package -Name "*Livemesh Addons for Beaver Builder*" -ErrorAction SilentlyContinue | Select-Object Name, Version
winget list --name "Livemesh Addons for Beaver Builder" 2>$null

How to fix CVE-2026-2029

Upgrade Livemesh Addons for Beaver Builder 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 livemesh-addons-for-beaver-builder
dpkg -s livemesh-addons-for-beaver-builder | grep -i ^Version

RHEL / CentOS / Rocky / AlmaLinux


sudo dnf upgrade --refresh livemesh-addons-for-beaver-builder -y
# or for older releases:
sudo yum update livemesh-addons-for-beaver-builder -y
rpm -q livemesh-addons-for-beaver-builder

SUSE / openSUSE


sudo zypper refresh
sudo zypper update livemesh-addons-for-beaver-builder
rpm -q livemesh-addons-for-beaver-builder

PHP / Composer


composer update livemesh/livemesh-addons-for-beaver-builder 2>/dev/null || composer update
composer show | head -20

WordPress


# Update via WP-CLI
wp plugin update --all
wp core update

Complete PowerShell remediation script (Windows)


# Fix script for CVE-2026-2029 affecting Livemesh Addons for Beaver Builder
# Run as administrator. Detect -> backup -> upgrade -> verify -> log.

$ErrorActionPreference = "Stop"
$LogPath  = "C:\Logs\CVE-2026-2029-fix-$(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"
    $pkg = Get-Package -Name "*Livemesh Addons for Beaver Builder*" -ErrorAction SilentlyContinue
    if ($pkg) { $pkg | Format-Table Name, Version }
    else { Write-Host "Not detected via Get-Package; try winget list" }

    Write-Host "[2/4] Backup configuration"
    $backup = "C:\Backup\livemesh-addons-for-beaver-builder-$(Get-Date -Format yyyyMMdd)"
    New-Item -ItemType Directory -Force $backup | Out-Null
    Get-ChildItem "C:\ProgramData\Livemesh Addons for Beaver Builder" -ErrorAction SilentlyContinue |
        Copy-Item -Destination $backup -Recurse -Force -ErrorAction SilentlyContinue

    Write-Host "[3/4] Apply the upgrade to See vendor advisory"
    winget upgrade --name "Livemesh Addons for Beaver Builder" --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 "Livemesh Addons for Beaver Builder"
    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-2026-2029 affecting Livemesh Addons for Beaver Builder
# Detect -> backup -> upgrade -> verify -> log.

set -euo pipefail
LOG="/var/log/cve-2026-2029-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 livemesh-addons-for-beaver-builder 2>/dev/null | grep -i ^Version || echo "livemesh-addons-for-beaver-builder not installed via dpkg"
elif command -v rpm >/dev/null; then
    rpm -q livemesh-addons-for-beaver-builder || echo "livemesh-addons-for-beaver-builder not installed via rpm"
fi

echo "[2/4] Backup configuration"
BACKUP="/root/backup-cve-2026-2029-$(date +%Y%m%d)"
mkdir -p "$BACKUP"
for d in /etc/livemesh-addons-for-beaver-builder /etc/livemesh-addons-for-beaver-builder.d /etc/livemesh-addons-for-beaver-builder.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 livemesh-addons-for-beaver-builder
elif command -v dnf >/dev/null; then
    dnf upgrade --refresh -y livemesh-addons-for-beaver-builder
elif command -v yum >/dev/null; then
    yum update -y livemesh-addons-for-beaver-builder
elif command -v zypper >/dev/null; then
    zypper --non-interactive update livemesh-addons-for-beaver-builder
fi

echo "[4/4] Verify the patched build"
if command -v dpkg >/dev/null; then
    dpkg -s livemesh-addons-for-beaver-builder 2>/dev/null | grep -i ^Version
elif command -v rpm >/dev/null; then
    rpm -q livemesh-addons-for-beaver-builder
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-2026-2029" -Direction Inbound -Action Block -Protocol TCP -LocalPort 80,443 -RemoteAddress Any -Enabled True
Get-NetFirewallRule -DisplayName "Block-CVE-2026-2029"

Disable the affected service (Linux)


sudo systemctl stop livemesh-addons-for-beaver-builder 2>/dev/null || true
sudo systemctl disable livemesh-addons-for-beaver-builder 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 livemesh-addons-for-beaver-builder 2>/dev/null | grep -i ^Version
rpm -q livemesh-addons-for-beaver-builder 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 "*Livemesh Addons for Beaver Builder*" | 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

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

Is CVE-2026-2029 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-2026-2029?

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-2026-2029?

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

Where is the official advisory for CVE-2026-2029?

The vendor advisory is at https://www.wordfence.com/threat-intel/vulnerabilities/id/8bc96b4f-256e-491b-9d27-de1adbf67643?source=cve. The NVD record is at https://nvd.nist.gov/vuln/detail/CVE-2026-2029.

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.*