⚠ 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-2026-3513: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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

*By Sai Kiran Pandrala*

Last verified: 2026-05-25

⚡ At a glance
SeverityCVSS 6.4, Medium
Actively exploited?No
AffectedRealmag777 TableOn – WordPress Posts Table Filterable (0 <= 1.0.4.4)
Fixed inSee vendor advisory
Type (CWE)CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVE-2026-3513 is a improper neutralization of input during web page generation ('cross-site scripting') in Realmag777 TableOn – WordPress Posts Table Filterable. The fix is to upgrade to see vendor advisory and apply the runnable commands below.

What is CVE-2026-3513?

The TableOn – WordPress Posts Table Filterable plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'tableon_button' shortcode in all versions up to and including 1.0.4.4. This is due to insufficient input sanitization and output escaping on user-supplied shortcode attributes such as 'class', 'help_link', 'popup_title', and 'help_title'. The do_shortcode_button() function extracts these attributes without sanitization and passes them to TABLEON_HELPER::draw_html_item(), which concatenates attribute values into HTML using single quotes without escaping (line 29: $item .=...

In practical terms, a successful attacker gets execution of attacker-controlled JavaScript in a victim's browser. There is no confirmed in-the-wild exploitation listed in CISA's KEV catalog at the time of writing, but the CVSS rating still warrants prompt patching.

Am I affected?

You are affected if you run Realmag777 TableOn – WordPress Posts Table Filterable at a version listed in the Affected row above. Probe your installed build with the commands below.


wp core version

How to fix CVE-2026-3513

The primary fix is to upgrade to the patched build listed in the Fixed in row above (See vendor advisory). Pick the platform that matches your install and run the commands below.

WordPress core (WP-CLI)


# Vendor advisory: https://www.wordfence.com/threat-intel/vulnerabilities/id/33490873-da99-465e-bfb6-44d2ba84f3ee?source=cve
wp core check-update
wp core update --version=<patched-version>
wp core update-db

PowerShell script (Windows): detect, back up, upgrade, verify, log


# Vendor advisory: https://www.wordfence.com/threat-intel/vulnerabilities/id/33490873-da99-465e-bfb6-44d2ba84f3ee?source=cve
# Run as Administrator
$ErrorActionPreference = 'Stop'
$log = "$env:ProgramData\TableOnWordPressPostsTableFilterable-Patch-CVE-2026-3513.log"
function Write-Log($msg) { "$(Get-Date -Format s)  $msg" | Tee-Object -FilePath $log -Append }

Write-Log "Starting CVE-2026-3513 remediation for Realmag777 TableOn – WordPress Posts Table Filterable"

# 1. Detect: replace the path/version probe with one valid for your install
$installed = (Get-WmiObject -Class Win32_Product |
    Where-Object { $_.Name -like '*TableOn*' } |
    Select-Object -First 1 -ExpandProperty Version)
Write-Log "Detected version: $installed"

if (-not $installed) {
    Write-Log "Product not installed on this host; nothing to do."
    return
}
if ([version]$installed -ge [version]'<patched-version>') {
    Write-Log "Already at fixed version $installed; no action needed."
    return
}

# 2. Backup configuration to a timestamped folder
$backup = "$env:ProgramData\TableOnWordPressPostsTableFilterable-Backup-$(Get-Date -Format yyyyMMdd-HHmm)"
New-Item -ItemType Directory -Path $backup -Force | Out-Null
$src = "$env:ProgramFiles\Realmag777\TableOn – WordPress Posts Table Filterable"
if (Test-Path $src) { Copy-Item -Path $src -Destination $backup -Recurse -Force }
Write-Log "Backed up config to $backup"

# 3. Apply the patched installer
$installer = "$env:TEMP\TableOnWordPressPostsTableFilterable-<patched-version>.msi"
if (-not (Test-Path $installer)) {
    throw "Patched installer not found at $installer. Stage it from your software repo first."
}
Start-Process msiexec.exe -ArgumentList "/i `"$installer`" /qn /norestart" -Wait
Write-Log "Installer finished"

# 4. Verify
$verify = (Get-WmiObject -Class Win32_Product |
    Where-Object { $_.Name -like '*TableOn*' } |
    Select-Object -First 1 -ExpandProperty Version)
if ([version]$verify -ge [version]'<patched-version>') {
    Write-Log "SUCCESS: now at $verify (>= <patched-version>)"
} else {
    Write-Log "FAILURE: still at $verify after install"
    exit 1
}

Bash script (Linux): detect, back up, upgrade, verify, log


# Vendor advisory: https://www.wordfence.com/threat-intel/vulnerabilities/id/33490873-da99-465e-bfb6-44d2ba84f3ee?source=cve
#!/usr/bin/env bash
set -euo pipefail
LOG=/var/log/tableon---wordpress-posts-table-filterable-patch-cve-2026-3513.log
log()  { echo "$(date -Iseconds)  $*" | tee -a "$LOG"; }

log "Starting CVE-2026-3513 remediation for Realmag777 TableOn – WordPress Posts Table Filterable"

# 1. Detect installed version (works for deb and rpm packages)
if command -v dpkg >/dev/null && dpkg -s tableon---wordpress-posts-table-filterable >/dev/null 2>&1; then
    CURRENT=$(dpkg-query -W -f='${Version}' tableon---wordpress-posts-table-filterable)
    PKG_MGR=apt
elif command -v rpm >/dev/null && rpm -q tableon---wordpress-posts-table-filterable >/dev/null 2>&1; then
    CURRENT=$(rpm -q --queryformat '%{VERSION}' tableon---wordpress-posts-table-filterable)
    PKG_MGR=dnf
else
    log "tableon---wordpress-posts-table-filterable not installed via apt or rpm; check your package manager or vendor instructions."
    exit 0
fi
log "Detected: tableon---wordpress-posts-table-filterable=$CURRENT (manager=$PKG_MGR)"

# 2. Backup config
BACKUP=/var/backups/tableon---wordpress-posts-table-filterable-$(date +%Y%m%d-%H%M)
mkdir -p "$BACKUP"
for d in /etc/tableon---wordpress-posts-table-filterable /etc/${pkg%%-*} ; do
    [ -d "$d" ] && cp -a "$d" "$BACKUP/" && log "Backed up $d to $BACKUP"
done

# 3. Upgrade
if [ "$PKG_MGR" = apt ]; then
    sudo apt-get update -y
    sudo apt-get install --only-upgrade -y tableon---wordpress-posts-table-filterable
else
    sudo dnf upgrade --security -y tableon---wordpress-posts-table-filterable
fi

# 4. Verify
if [ "$PKG_MGR" = apt ]; then
    NEW=$(dpkg-query -W -f='${Version}' tableon---wordpress-posts-table-filterable)
else
    NEW=$(rpm -q --queryformat '%{VERSION}' tableon---wordpress-posts-table-filterable)
fi
log "After upgrade: $NEW"
log "Done. Compare $NEW against <patched-version> and restart the affected service if needed."

If you cannot patch immediately

These are runnable hardening commands. They reduce blast radius but they are not a replacement for the vendor patch.

Tighten Content-Security-Policy and cookie flags


add_header Content-Security-Policy "default-src 'self'; script-src 'self'" always;
add_header X-Frame-Options DENY always;
add_header X-Content-Type-Options nosniff always;

How to verify the fix worked

Run the version probe again and confirm the running build matches the Fixed in row above.


wp core version

Expected output: the patched build (or higher).

Re-run any vulnerability scanner you used previously and confirm the finding for CVE-2026-3513 has cleared. Sweep your logs for indicators of compromise listed in the vendor or CISA advisory, especially if the system was internet-reachable during the disclosure window.

Frequently asked questions

Is CVE-2026-3513 being actively exploited?

Not at the time of writing. It is not listed in CISA's Known Exploited Vulnerabilities catalog. That status can change, so monitor the vendor advisory and the KEV catalog if the system is exposed.

How severe is CVE-2026-3513?

CVSS rates it 6.4 (Medium). Use that score to set your patch priority alongside the other items in your queue.

Do I have to take TableOn – WordPress Posts Table Filterable offline to apply the patch?

It depends on the deployment. High-availability or clustered installs can usually patch one node at a time with no full outage. Standalone installs typically need a short restart. Always follow the vendor's documented upgrade steps.

What if my vulnerability scanner still flags CVE-2026-3513 after I patch?

Re-run the scan after a service restart, then confirm the scanner's plugin set is up to date. Some scanners detect by banner version only and lag the official fix metadata by a release.

References

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