CVE-2026-81159: Observable Timing Discrepancy vulnerability in Drupal Commerce CyberSource allows Brute Force

Routine

LOW 3.7REMOTEUPGRADE

CVE-2026-81159 is a low-severity flaw (CVSS 3.7) affecting commerce cybersource. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Observable Timing Discrepancy vulnerability in Drupal Commerce CyberSource allows Brute Force. This issue affects Commerce CyberSource versions: from 0.0.0 to 1.10.0.

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	0.3% (top 83%)
CISA exploited list	No
Weakness	CWE-208
Published	2026-09-02
Last modified	2026-09-16

Publisher (CNA): Drupal.org · Vendor: centarro

Last updated 2026-09-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-02 13:18 UTCPublished CVE record published
2026-09-16 20:19 UTCUpdated Record last modified

centarro commerce cybersource UPGRADE

Affected: >= 8.x-1.0 and < 8.x-1.10

Fixed in: 8.x-1.10

Safe to downgrade to: a release before 8.x-1.0

1. Check installed version

apt-cache policy commerce-cybersource || rpm -q commerce-cybersource || commerce-cybersource --version

2. UPGRADE to 8.x-1.10 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade commerce-cybersource

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade commerce-cybersource

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.x-1.0 (Debian / Ubuntu)

apt-cache madison commerce-cybersource sudo apt install commerce-cybersource=<VERSION_BEFORE_8.x-1.0> sudo apt-mark hold commerce-cybersource

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

dnf --showduplicates list commerce-cybersource sudo dnf downgrade commerce-cybersource-<VERSION_BEFORE_8.x-1.0> sudo dnf versionlock add commerce-cybersource

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-2026-81159?

commerce cybersource: upgrade to 8.x-1.10. Exact commands for each OS are on this page.

Is CVE-2026-81159 being exploited?

CVE-2026-81159 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-2026-81159 affect?

CVE-2026-81159 affects commerce cybersource. Severity is low (CVSS 3.7). Observable Timing Discrepancy vulnerability in Drupal Commerce CyberSource allows Brute Force. This issue affects Commerce CyberSource versions: from 0.0.0 to 1.10.0.

How urgent is CVE-2026-81159?

Priority 22/100. Remotely exploitable, no login, no user action

Software pages

Drupal vulnerabilities

References

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