Commerce CyberSource security updates, in plain English

Commerce CyberSource

102 sites report using it · on drupal.org · 1 security update explained here

This module connects the website online shop to a specific payment processing service.

Below is every security update for Commerce CyberSource that this site has covered, newest first. Each one says who could exploit it, whether it applies to your site, how urgent it is, and what to tell your developer. If your site uses this module and you are not sure which version, that is the first question to ask whoever looks after it.

Commerce CyberSource

Moderately critical · 102 sites report using it · SA-CONTRIB-2026-106 · on drupal.org · Week of 26 August 2026

Anyone without logging in could manipulate the timing of messages sent back from the payment provider. This would allow them to trick the website into recording a successful payment when no money was actually taken. They could not read any private data.

Who could do thisAnyone visiting the site. No login needed.
Does it apply to youA site is affected if it uses the off site redirect payment method.
Has it been used in attacksNo sign of it.
How urgentDrupal rates this moderately critical. Include it in your next routine update, within the month.

Tell your developerUpdate Commerce CyberSource to 8.x-1.10.

For developers: what the fix changed

The fix updates the signature validation in the validateResponse function of src/Plugin/Commerce/PaymentGateway/CyberSourceSahc.php to use hash_equals. This ensures the comparison executes in constant time to prevent timing attacks.

Also in this release The release also added JWT signature verification for transient tokens in the Flex payment gateway.

8.x-1.9 to 8.x-1.10 1 commit, 2 files.

src/Plugin/Commerce/PaymentGateway/CyberSourceSahc.php +26 −6 fix
src/Plugin/Commerce/PaymentGateway/Flex.php +36 −4

Full diff, 8.x-1.9 to 8.x-1.10

The comparison is against the release immediately before the fix. If your site is on an older release, more will have changed.

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Commerce CyberSource

Commerce CyberSource

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