CVE-2026-56702 vrana CVE debrief

Who should care

Defenders responsible for Adminer deployments, particularly those using the AdminerFileUpload plugin, should assess exposure and verify the uploadPath configuration. This includes reviewing current versions, understanding the potential impact of unrestricted file uploads, and implementing necessary restrictions on file uploads to prevent exploitation. Security teams and vulnerability management teams should prioritize this vulnerability due to its high-sev

Why it matters

CVE-2026-56702 is a high-severity vulnerability in AdminerFileUpload plugin that allows authenticated users to upload PHP files and execute arbitrary code. Defenders should prioritize verifying exposure and assessing the uploadPath configuration.

• Authenticated users can upload malicious PHP files
• Arbitrary code execution as the web-server user is possible
• Verify exposure of Adminer versions before 5.4.3
• Restrict file uploads to only necessary extensions

Technical summary

The AdminerFileUpload plugin in Adminer versions before 5.4.3 contains an unrestricted file upload vulnerability. Authenticated users can upload PHP files by exploiting a permissive default extension allowlist. Attackers can upload PHP webshells to columns ending in _path and execute arbitrary code as the web-server user when uploadPath is web-served. This issue allows for potential code execution and highlights the need for defenders to verify exposure and assess the uploadPath configuration to mitigate risks effectively.

Defensive priority

Defenders should prioritize verifying exposure of Adminer versions before 5.4.3 and assessing the uploadPath configuration.

Recommended defensive actions

• Verify exposure of Adminer versions before 5.4.3
• Assess the uploadPath configuration
• Restrict file uploads to only necessary extensions
• 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 details on the unrestricted file upload vulnerability in AdminerFileUpload plugin. However, the corpus does not establish versions, exploitation, impact, or remediation beyond vendor-provided information.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.