CVE-2026-11806: IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.6 is affected by an arbitrary file read vul

Routine

HIGH 7.2UPGRADE

CVE-2026-11806 is a high-severity flaw (CVSS 7.2) affecting websphere application server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.6 is affected by an arbitrary file read vulnerability with the restConnector-2.0 feature enabled.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-444
Published	2026-06-30
Last modified	2026-10-25

Publisher (CNA): IBM Corporation · Vendor: ibm

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

Am I affected?

Timeline

2026-06-30 20:17 UTCPublished CVE record published
2026-10-25 21:10 UTCUpdated Record last modified

ibm websphere application server UPGRADE

Affected: >= 17.0.0.3 and < 26.0.0.7

Fixed in: 26.0.0.7

Safe to downgrade to: a release before 17.0.0.3

1. Check installed version

apt-cache policy websphere-application-server || rpm -q websphere-application-server || websphere-application-server --version

2. UPGRADE to 26.0.0.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade websphere-application-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade websphere-application-server

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 17.0.0.3 (Debian / Ubuntu)

apt-cache madison websphere-application-server sudo apt install websphere-application-server=<VERSION_BEFORE_17.0.0.3> sudo apt-mark hold websphere-application-server

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list websphere-application-server sudo dnf downgrade websphere-application-server-<VERSION_BEFORE_17.0.0.3> sudo dnf versionlock add websphere-application-server

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-2026-11806?

websphere application server: upgrade to 26.0.0.7. Exact commands for each OS are on this page.

Is CVE-2026-11806 being exploited?

CVE-2026-11806 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-2026-11806 affect?

CVE-2026-11806 affects websphere application server. Severity is high (CVSS 7.2). IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.6 is affected by an arbitrary file read vulnerability with the restConnector-2.0 feature enabled.

How urgent is CVE-2026-11806?

Priority 35/100. High severity

Software pages

IBM WebSphere vulnerabilities

Related CVEs

CVE-2026-10845 HIGH 7.3 UPGRADE IBM WebSphere Application Server 8.5 and 9.0 could allow a remote attacker to bypass authentication and gain u
CVE-2026-9006 HIGH 7.4 UPGRADE IBM WebSphere Application Server 9.0, and 8.5 is vulnerable to server-side request forgery (SSRF) with the Aja
CVE-2026-11708 CRITICAL 9.3 UPGRADE IBM WebSphere Application Server 9.0, and 8.5 is affected by a cross-site scripting vulnerability in the admin
CVE-2026-11712 CRITICAL 9.3 UPGRADE IBM WebSphere Application Server 9.0, and 8.5 is affected by a cross-site scripting vulnerability in the admin
CVE-2026-11541 HIGH 7.4 UPGRADE IBM CICS Transaction Gateway for Multiplatforms 9.1, 9.2, 9.3, and 10.1 IBM WebSphere Application Server 9.0,

References

← Back to latest CVEs