XML-RPC/SOAP API Vulnerability in OpenMage Magento Long Term Support
CVE-2026-42155

9.3CRITICAL

Key Information:

Vendor

Openmage

Status
Magento-lts
Vendor
CVE Published:
15 May 2026

What is CVE-2026-42155?

The XML-RPC/SOAP API in OpenMage Magento Long Term Support permits session ID generation through an outdated time-based method instead of utilizing a Cryptographically Secure Pseudo-Random Number Generator (CSPRNG). This method's reliance on time-derived inputs leads to inadequate entropy, making it susceptible to brute-force attacks. An attacker can exploit this weakness to hijack active API sessions by leveraging predictable session IDs and the absence of API rate-limiting. The vulnerability has been addressed in version 20.18.0.

Affected Version(s)

magento-lts < 20.18.0

References

https://github.com/OpenMage/magento-lts/security/advisori...
x_refsource_CONFIRM

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.