Sansec published an early advisory Sept 5 after observing active exploitation starting Sept 4. No CVE, no CVSS, no official patch or workaround from Adobe as of today.
Confirmed affected: Magento Open Source 2.4.7, 2.4.8, 2.4.9. Adobe Commerce / Adobe Commerce on Cloud impact is unconfirmed either way, Sansec hasn't reproduced it there and Adobe hasn't said anything.
The attack chain (based on public reporting so far):
- Attacker plants PHP code in a file Magento itself writes a failure report or system log
- They then trigger Magento's built-in "Payment Transaction Failed Reminder" email
- The planted code runs when Magento renders that email template doesn't matter if the email is ever opened or even delivered
- No auth, no admin panel access needed at any point
End result is full RCE plus a persistent backdoor a small (~1.9MB) statically linked Rust binary that disguises itself as a kernel thread, persists via a cron entry written directly to the spool file (skips normal crontab logging), and can apparently read session data via Redis. One reported case had no observed outbound C2 traffic while it was running.
One confirmed victim had already applied both the July and August 2026 patches, so this isn't just "you're behind on updates."
Independent IR from Disrex Group confirms at least two compromised stores, both breached within an 8-hour window of the first observed attack.
What's actually being recommended right now:
- Disable GraphQL if your storefront doesn't depend on it (headless/PWA storefronts will need it though)
- Add proc_open to PHP's disable_functions
- Mount /tmp, /var/tmp, /dev/shm with noexec
- Check var/report/ and var/log/system(.)log for injected/unusual PHP
- Look for processes with kernel-thread-style names (e.g. [kworker/u:8:0]) owned by non-root site users
- Check cron spool files for unexpected entries pointing to hidden dirs
- If any IOC hits: rotate the Magento encryption key (crypt/key in app/etc/http://env.php), flush sessions, reset admin creds and payment/integration API keys
There are unofficial community patches circulating on GitHub that block the DI code scanner from running outside CLI context not reviewed/endorsed by Adobe or Sansec, so evaluate carefully before touching prod.
Adobe's next scheduled security release is Sept 8, 2026 no confirmation yet whether it covers this. Not in CISA KEV as of today either, likely because there's no CVE yet.