● Medium · CVSS 5.4

How to Fix CVE-2026-22789: Unrestricted File Upload in WebErpMesv2

Q: Is CVE-2026-22789 being exploited in the wild?

Public exploitation has not been confirmed by CISA at the time of writing. Treat the patch as time-sensitive anyway; reports often lag actual abuse.

Q: Will a WAF or IDS rule fully mitigate CVE-2026-22789?

No. Network-layer filters can reduce noise and slow opportunistic scanners, but they will not stop a determined attacker. The vendor patch is the only durable fix.

Q: How long should I plan for the upgrade?

Typical vendor-documented upgrade windows for WebErpMesv2 run from a few minutes to under an hour depending on cluster size. Test in a staging environment first and follow the vendor's documented HA upgrade order.

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

How to Fix CVE-2026-6383: Incorrect authorization in Red Hat OpenShift Virtualization 4 — Incorrect authorization in Red Hat OpenShift Virtualization 4
How to Fix CVE-2026-32985: Authentication Bypass in Xerte Online Toolkits — Authentication Bypass in Xerte Online Toolkits
How to Fix CVE-2026-4695: Critical Vulnerability in Firefox , Critical Vulnerability in Firefox
How to Fix CVE-2026-2174: Authentication Bypass in Contact Management System , Authentication Bypass in Contact Management System
How to Fix CVE-2026-39109: SQL injection in SQL Injection , SQL injection in SQL Injection

*By Sai Kiran Pandrala*

⚡ At a glance


Severity	CVSS 5.4 - Medium
Actively exploited?	Not currently listed in CISA KEV
Affected	< 1.19
Fixed in	1.19.
Type (CWE)	CWE-434: Unrestricted Upload of File with Dangerous Type

What is CVE-2026-22789?

CVE-2026-22789 is an unrestricted file upload flaw in WebErpMesv2. An attacker can upload files of arbitrary type or to arbitrary locations, leading to webshell deployment and remote code execution. Vendor description: WebErpMesv2 is a Resource Management and Manufacturing execution system Web for industry. Prior to 1.19, WebErpMesv2 contains a file upload validation bypass vulnerability in multiple controllers that allows authenticated users to upload arbitrary files, including PHP scripts, leading to Remote Code Execution (RCE).

Why this CVE matters

Unrestricted file upload is the classic webshell vector. The attacker uploads a script with an executable extension, then requests it through the same web server to execute commands.

For deployments of WebErpMesv2 that have been exposed to the public internet during the disclosure window, the operating assumption should be that scanning has already happened. Even where exploitation has not been publicly observed, scanning for the vulnerable fingerprint is cheap and routine. Patching closes the door; log review and credential rotation close out the rest of the response.

Am I affected?

You are affected if your installation matches any of these version ranges:

WebErpMesv2: < 1.19

Check your installed version against the list above. If you cannot determine the version, treat the system as affected and follow the upgrade path below.

Open WebErpMesv2's About dialog or run the vendor-documented version-check command. Compare the result against the affected ranges in the advisory.

How to fix CVE-2026-22789

Read the vendor advisory in full: https://github.com/SMEWebify/WebErpMesv2/security/advisories/GHSA-64rv-f829-x6m4
Upgrade WebErpMesv2 to the patched build listed in the vendor advisory.
Back up the configuration (and database, where applicable) before upgrading.
Apply the patch in a maintenance window. For HA pairs, upgrade the standby node first, fail over, then upgrade the former primary.
Restart the affected service so the patched binary loads, then verify the new version (see verification section).

Ubuntu / Debian

_Verify the exact patched build against the vendor advisory: https://github.com/SMEWebify/WebErpMesv2/security/advisories/GHSA-64rv-f829-x6m4_


sudo apt-get update
sudo apt-get install --only-upgrade php
dpkg -s php | grep -i version

RHEL / Rocky / AlmaLinux / Fedora


sudo dnf upgrade --refresh php -y
rpm -q php

openSUSE


sudo zypper refresh
sudo zypper update php
rpm -q php

Bash detect / upgrade / verify runner (Linux)

_Verify the exact patched build against the vendor advisory: https://github.com/SMEWebify/WebErpMesv2/security/advisories/GHSA-64rv-f829-x6m4_


#!/usr/bin/env bash
# CVE-2026-22789 remediation runner. Re-runnable; exits non-zero on failure.
set -euo pipefail
log() { printf '%s %s\n' "$(date -Is)" "$*" | tee -a /var/log/cve-2026-22789-fix.log; }

PKG="php"
TARGET_VERSION="see vendor advisory"

log "Detect: reading current $PKG version"
if command -v dpkg >/dev/null 2>&1; then
    current=$(dpkg-query -W -f='${Version}' "$PKG" 2>/dev/null || echo "not-installed")
elif command -v rpm >/dev/null 2>&1; then
    current=$(rpm -q --qf '%{VERSION}-%{RELEASE}' "$PKG" 2>/dev/null || echo "not-installed")
else
    current="unknown"
fi
log "Current: $current (target per advisory: $TARGET_VERSION)"

log "Backup: snapshotting /etc/$PKG if present"
backup="/var/backups/cve-2026-22789-$(date +%Y%m%d-%H%M)"
mkdir -p "$backup"
[ -d "/etc/$PKG" ] && cp -a "/etc/$PKG" "$backup/" || true

log "Upgrade: applying vendor patch"
if command -v apt-get >/dev/null 2>&1; then
    sudo apt-get update -qq
    sudo apt-get install -y --only-upgrade "$PKG"
elif command -v dnf >/dev/null 2>&1; then
    sudo dnf upgrade -y "$PKG"
elif command -v yum >/dev/null 2>&1; then
    sudo yum update -y "$PKG"
fi

log "Verify: re-reading $PKG version"
if command -v dpkg >/dev/null 2>&1; then
    after=$(dpkg-query -W -f='${Version}' "$PKG")
else
    after=$(rpm -q --qf '%{VERSION}-%{RELEASE}' "$PKG")
fi
log "After: $after"

if [ "$after" != "$current" ]; then
    log "SUCCESS: $PKG upgraded"
else
    log "WARN: version unchanged. Confirm the patched build is in your repository."
    exit 1
fi

Verify the fix landed


# 1. Confirm the running version matches the patched build
#    (target per advisory: see vendor advisory)
#    Use the platform-specific version probe shown above.

# 2. Re-scan the host with your vulnerability scanner (Nessus, Qualys, Tenable,
#    Rapid7, OpenVAS). The scanner should no longer flag CVE-2026-22789.

# 3. Inspect service and kernel logs for crash-loops or rollback events
journalctl --since "10 minutes ago" | grep -iE 'error|fail|panic'
dmesg --since "10 minutes ago" | tail -50

If you cannot patch immediately

No official workaround exists beyond restricting network exposure to the affected component. Apply the vendor patch as the primary remediation.

How to verify the fix worked

After applying the patch, verify the running version in the product's admin UI or via the vendor-documented CLI command.
Confirm the patched build matches the version listed in the vendor advisory.
Run an authenticated vulnerability scan with a current signature set and confirm the scanner no longer flags CVE-2026-22789.
Review logs for the entire pre-patch window for indicators of compromise listed in the vendor or CISA advisory.
Confirm any network-layer mitigations that were applied as a stopgap have been reverted (or left in place intentionally) once the patch is verified.

If your installation was internet-reachable during the disclosure window, treat log review as part of the remediation rather than an optional follow-up. Look for unexpected administrator accounts in WebErpMesv2, scheduled tasks or cron jobs you did not create, new files in web-accessible directories, and outbound connections to addresses not in your baseline. Suspicious requests to the vulnerable endpoint immediately followed by successful 200-class responses with unusually large bodies are a strong indicator of exploitation.

Frequently asked questions

Is CVE-2026-22789 being exploited in the wild?