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CVE-2026-13772: IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 's Object Query Language engine resolves attacker-supplied

37
Routine
HIGH 7.5UPGRADE

CVE-2026-13772 is a high-severity flaw (CVSS 7.5) affecting websphere extreme scale. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 's Object Query Language engine resolves attacker-supplied class names via Class.forName() and invokes their constructors with no allow-list at three distinct sinks (SELECT NEW, enum literals, and reflection-based comparators); an authenticated remote attacker who can influence an application-built OQL query string can execute arbitrary constructors on the WAS JVM, and a SELECT DISTINCT variant

Why this priority

  • High severity

A fixed release or distro patch exists.

Risk facts

CVSS score7.5 (High)
Attack vectorNetwork (remote)
Attack complexityHigh
Privileges neededLow
User interactionNone
EPSS exploit chance0.5% (top 57%)
CISA exploited listNo
WeaknessCWE-470
Published2026-06-30
Last modified2026-10-25
Publisher (CNA): IBM Corporation · Vendor: ibm

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Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

ibm websphere extreme scale UPGRADE
Affected: >= 8.6.1.0 and <= 8.6.1.6
Fixed in: newer than 8.6.1.6
Safe to downgrade to: a release before 8.6.1.0
1. Check installed version
apt-cache policy websphere-extreme-scale || rpm -q websphere-extreme-scale || websphere-extreme-scale --version
2. UPGRADE to newer than 8.6.1.6 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade websphere-extreme-scale
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade websphere-extreme-scale
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 8.6.1.0 (Debian / Ubuntu)
apt-cache madison websphere-extreme-scale sudo apt install websphere-extreme-scale=<VERSION_BEFORE_8.6.1.0> sudo apt-mark hold websphere-extreme-scale
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list websphere-extreme-scale sudo dnf downgrade websphere-extreme-scale-<VERSION_BEFORE_8.6.1.0> sudo dnf versionlock add websphere-extreme-scale
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.
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.

Quick answers

How do I fix CVE-2026-13772?

websphere extreme scale: upgrade to newer than 8.6.1.6. Exact commands for each OS are on this page.

Is CVE-2026-13772 being exploited?

CVE-2026-13772 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-13772 affect?

CVE-2026-13772 affects websphere extreme scale. Severity is high (CVSS 7.5). IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 's Object Query Language engine resolves attacker-supplied class names via Class.forName() and invokes their constructors with no allow-list at three distinct sinks (SELECT NEW, enum liter

How urgent is CVE-2026-13772?

Priority 37/100. High severity

Software pages

IBM WebSphere vulnerabilities

Related CVEs

References

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