● Medium · CVSS 4.3

How to Fix CVE-2026-1369: Open redirect in Conditional CAPTCHA

Q: What is the CVSS score for CVE-2026-1369?

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

Q: Where is the official advisory for CVE-2026-1369?

The vendor advisory is at [https://wpscan.com/vulnerability/5a275725-85f2-4463-880b-9473dbdfa8e0/](https://wpscan.com/vulnerability/5a275725-85f2-4463-880b-9473dbdfa8e0/). The NVD record is at https://nvd.nist.gov/vuln/detail/CVE-2026-1369.

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

CVE-2026-1369 is a open redirect in Unknown Conditional CAPTCHA. The fix is to apply the vendor patch noted below.

⚡ At a glance


Severity	4.3 (Medium)
Actively exploited?	No public listing in CISA KEV
Affected	Conditional CAPTCHA 0 to <=4.0.0
Fixed in	See vendor advisory
Type (CWE)	CWE-601 URL Redirection to Untrusted Site ('Open Redirect')

What is CVE-2026-1369?

The Conditional CAPTCHA WordPress plugin through 4.0.0 does not validate a parameter before redirecting the user to its value, leading to an Open Redirect issue The CVSS base score is 4.3 (Medium). The official advisory is at https://wpscan.com/vulnerability/5a275725-85f2-4463-880b-9473dbdfa8e0/.

Am I affected?

Check the version of Conditional CAPTCHA you are running and compare it against the Affected row above (Conditional CAPTCHA 0 to <=4.0.0). If your build sits inside the affected range, you must patch.

Run the version check that fits your platform:


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


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

How to fix CVE-2026-1369

Upgrade Conditional CAPTCHA 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 conditional-captcha
dpkg -s conditional-captcha | grep -i ^Version

RHEL / CentOS / Rocky / AlmaLinux


sudo dnf upgrade --refresh conditional-captcha -y
# or for older releases:
sudo yum update conditional-captcha -y
rpm -q conditional-captcha

SUSE / openSUSE


sudo zypper refresh
sudo zypper update conditional-captcha
rpm -q conditional-captcha

PHP / Composer


composer update unknown/conditional-captcha 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-2026-1369 affecting Conditional CAPTCHA
# Run as administrator. Detect -> backup -> upgrade -> verify -> log.

$ErrorActionPreference = "Stop"
$LogPath  = "C:\Logs\CVE-2026-1369-fix-$(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"
    $pkg = Get-Package -Name "*Conditional CAPTCHA*" -ErrorAction SilentlyContinue
    if ($pkg) { $pkg | Format-Table Name, Version }
    else { Write-Host "Not detected via Get-Package; try winget list" }

    Write-Host "[2/4] Backup configuration"
    $backup = "C:\Backup\conditional-captcha-$(Get-Date -Format yyyyMMdd)"
    New-Item -ItemType Directory -Force $backup | Out-Null
    Get-ChildItem "C:\ProgramData\Conditional CAPTCHA" -ErrorAction SilentlyContinue |
        Copy-Item -Destination $backup -Recurse -Force -ErrorAction SilentlyContinue

    Write-Host "[3/4] Apply the upgrade to See vendor advisory"
    winget upgrade --name "Conditional CAPTCHA" --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 "Conditional CAPTCHA"
    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-2026-1369 affecting Conditional CAPTCHA
# Detect -> backup -> upgrade -> verify -> log.

set -euo pipefail
LOG="/var/log/cve-2026-1369-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 conditional-captcha 2>/dev/null | grep -i ^Version || echo "conditional-captcha not installed via dpkg"
elif command -v rpm >/dev/null; then
    rpm -q conditional-captcha || echo "conditional-captcha not installed via rpm"
fi

echo "[2/4] Backup configuration"
BACKUP="/root/backup-cve-2026-1369-$(date +%Y%m%d)"
mkdir -p "$BACKUP"
for d in /etc/conditional-captcha /etc/conditional-captcha.d /etc/conditional-captcha.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 conditional-captcha
elif command -v dnf >/dev/null; then
    dnf upgrade --refresh -y conditional-captcha
elif command -v yum >/dev/null; then
    yum update -y conditional-captcha
elif command -v zypper >/dev/null; then
    zypper --non-interactive update conditional-captcha
fi

echo "[4/4] Verify the patched build"
if command -v dpkg >/dev/null; then
    dpkg -s conditional-captcha 2>/dev/null | grep -i ^Version
elif command -v rpm >/dev/null; then
    rpm -q conditional-captcha
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-2026-1369" -Direction Inbound -Action Block -Protocol TCP -LocalPort 80,443 -RemoteAddress Any -Enabled True
Get-NetFirewallRule -DisplayName "Block-CVE-2026-1369"

Disable the affected service (Linux)


sudo systemctl stop conditional-captcha 2>/dev/null || true
sudo systemctl disable conditional-captcha 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 conditional-captcha 2>/dev/null | grep -i ^Version
rpm -q conditional-captcha 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 "*Conditional CAPTCHA*" | 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:

How to Fix CVE-2026-26093: Command Injection in opds — Command Injection in opds
How to Fix CVE-2026-44542: Path Traversal in filebrowser — Path Traversal in filebrowser
How to Fix CVE-2026-1111: Path Traversal in PublicCMS , Path Traversal in PublicCMS
How to Fix CVE-2026-8113: Path Traversal in MiniClaw , Path Traversal in MiniClaw
How to Fix CVE-2026-22388: Critical Vulnerability in Owl Carousel WP , Critical Vulnerability in Owl Carousel WP

Is CVE-2026-1369 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-2026-1369?

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-2026-1369?

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

Where is the official advisory for CVE-2026-1369?

The vendor advisory is at https://wpscan.com/vulnerability/5a275725-85f2-4463-880b-9473dbdfa8e0/. The NVD record is at https://nvd.nist.gov/vuln/detail/CVE-2026-1369.

References

Official vendor advisory: https://wpscan.com/vulnerability/5a275725-85f2-4463-880b-9473dbdfa8e0/
NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-1369
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.*