CVE-2026-42155: Magento LTS has Weak API Session ID — Predictable MD5 of Time-Derived Inputs

critical Affects openmage/magento-lts. Feed 2026.10.29.3, updated 2026-10-29; published ; advisory modified .

Magento LTS has Weak API Session ID — Predictable MD5 of Time-Derived Inputs

Package
openmage/magento-lts Composer
Affected versions
<20.18.0
Fixed in
20.18.0
Severity
critical
Exploitation
not on CISA KEV · EPSS 0% (30.4th percentile)
Published
2026-05-05
Source
osv.dev

References

CWE-330CWE-331CWE-338
NVD recordopenmage/magento-lts advisories

Am I affected?

Find out in one command. phpwarden checks your composer.lock against this advisory and 20,000+ others, ranked by real-world exploitation (CISA KEV + EPSS). Free, offline, open data.

# PHP projects (recommended)
composer require --dev phpwarden/phpwarden
# then
vendor/bin/phpwarden deps composer.lock

# or, without Composer
pipx install phpwarden   &&   phpwarden deps composer.lock

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