PatchTheCVECVE-2026-12118: IBM webMethods Integration (on prem) 10.15, 10.11 could allow an unauthenticated remote attacker to execute ar
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CRITICAL 9.8REMOTEDOWNGRADE
CVE-2026-12118 is a critical-severity flaw (CVSS 9.8) affecting webmethods integration. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
IBM webMethods Integration (on prem) 10.15, 10.11 could allow an unauthenticated remote attacker to execute arbitrary code on the system due to the deserialization of untrusted data.
Why this priority
- Critical severity
- CISA SSVC: automatable with total technical impact
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.8% (top 42%) |
| CISA exploited list | No |
| Weakness | CWE-502 |
| Published | 2026-07-30 |
| Last modified | 2026-10-23 |
Publisher (CNA): IBM Corporation · Vendor: ibm
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
ibm webmethods integration DOWNGRADE
Affected: 10.11 · 10.15
Fixed in: no fixed release known
Safe to downgrade to: a release before 10.11
1. Check installed version
apt-cache policy webmethods-integration || rpm -q webmethods-integration || webmethods-integration --version
2. No fixed release: DOWNGRADE to a release before 10.11 (Debian / Ubuntu)
apt-cache madison webmethods-integration
sudo apt install webmethods-integration=<VERSION_BEFORE_10.11>
sudo apt-mark hold webmethods-integration
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list webmethods-integration
sudo dnf downgrade webmethods-integration-<VERSION_BEFORE_10.11>
sudo dnf versionlock add webmethods-integration
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
Exact fixes by distribution
A distro patch exists: prefer upgrading over downgrading.
Fedora 46 · pspp · FIXED · 2.1.3-2.fc46 · FEDORA-2026-0d6444911b · source
sudo dnf upgrade --advisory=FEDORA-2026-0d6444911b
Fedora ELN · barman · FIXED · 3.20.1-3.eln159 · FEDORA-2026-45ecf042c2 · source
sudo dnf upgrade --advisory=FEDORA-2026-45ecf042c2
Public exploits and detection
Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.
- GitHub PoC: uday952/CVE-2026-12118-POC- (0 stars)
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.