CVE-2025-36326: IBM Cognos Controller 11.0.0 through 11.0.1, and IBM Controller 11.1.0 through 11.1.1 could allow an attacker

Routine

LOW 3.7REMOTEUPGRADEUPGRADE

CVE-2025-36326 is a low-severity flaw (CVSS 3.7) affecting cognos controller, controller. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

IBM Cognos Controller 11.0.0 through 11.0.1, and IBM Controller 11.1.0 through 11.1.1 could allow an attacker to obtain sensitive information due to the use of hardcoded cryptographic keys for signing session cookies.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	3.7 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 86%)
CISA exploited list	No
Weakness	CWE-321
Published	2025-09-26
Last modified	2026-10-18

Publisher (CNA): IBM Corporation · Vendor: ibm

Last updated 2026-10-18 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-09-26 15:16 UTCPublished CVE record published
2026-10-18 21:10 UTCUpdated Record last modified

ibm cognos controller UPGRADE

Affected: >= 11.0.0 and <= 11.0.1

Fixed in: newer than 11.0.1

Safe to downgrade to: a release before 11.0.0

1. Check installed version

apt-cache policy cognos-controller || rpm -q cognos-controller || cognos-controller --version

2. UPGRADE to newer than 11.0.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade cognos-controller

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cognos-controller

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 11.0.0 (Debian / Ubuntu)

apt-cache madison cognos-controller sudo apt install cognos-controller=<VERSION_BEFORE_11.0.0> sudo apt-mark hold cognos-controller

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

dnf --showduplicates list cognos-controller sudo dnf downgrade cognos-controller-<VERSION_BEFORE_11.0.0> sudo dnf versionlock add cognos-controller

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.

ibm controller UPGRADE

Affected: >= 11.1.0 and <= 11.1.1

Fixed in: newer than 11.1.1

Safe to downgrade to: a release before 11.1.0

1. Check installed version

apt-cache policy controller || rpm -q controller || controller --version

2. UPGRADE to newer than 11.1.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade controller

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade controller

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 11.1.0 (Debian / Ubuntu)

apt-cache madison controller sudo apt install controller=<VERSION_BEFORE_11.1.0> sudo apt-mark hold controller

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

dnf --showduplicates list controller sudo dnf downgrade controller-<VERSION_BEFORE_11.1.0> sudo dnf versionlock add controller

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-2025-36326?

cognos controller: upgrade to newer than 11.0.1; controller: upgrade to newer than 11.1.1. Exact commands for each OS are on this page.

Is CVE-2025-36326 being exploited?

CVE-2025-36326 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-2025-36326 affect?

CVE-2025-36326 affects cognos controller, controller. Severity is low (CVSS 3.7). IBM Cognos Controller 11.0.0 through 11.0.1, and IBM Controller 11.1.0 through 11.1.1 could allow an attacker to obtain sensitive information due to the use of hardcoded cryptographic keys for signing session cookies.

How urgent is CVE-2025-36326?

Priority 21/100. Remotely exploitable, no login, no user action

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References

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