CVE-2026-57743 stmcan CVE debrief

Who should care

Users of RT-Theme 18 | Extensions up to version 2.5 should prioritize patching this HIGH severity vulnerability. The vulnerability has a CVSS score of 8.1 and is considered HIGH severity. The official CVE record and NVD detail page provide additional context.

Technical summary

CVE-2026-57743 is a PHP Remote File Inclusion vulnerability in RT-Theme 18 | Extensions, allowing for PHP Local File Inclusion. The vulnerability has a CVSS score of 8.1 and is considered HIGH severity. The vulnerability affects RT-Theme 18 | Extensions from n/a through <= 2.5. Users of RT-Theme 18 | Extensions up to version 2.5 should prioritize patching this vulnerability. The official CVE record and NVD detail page provide additional context. Further investigation and verification are necessary to fully understand the scope of the vulnerability, especially regarding potential local file inclusion impacts and necessary defensive measures.

Defensive priority

Patching is recommended as a top priority due to the HIGH severity and potential for local file inclusion.

Recommended defensive actions

• Apply the patch for RT-Theme 18 | Extensions version 2.5 or later
• Inventory and verify the version of RT-Theme 18 | Extensions in use
• Monitor for potential exploitation attempts
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability. Further investigation and verification are necessary to fully understand the scope of the vulnerability. The vulnerability has a CVSS score of 8.1 and is considered HIGH severity. Users of RT-Theme 18 | Extensions up to version 2.5 should prioritize patching this vulnerability. The official CVE record and NVD detail page provide additional context.

Official resources