CVE-2026-5027: exploitation status and patch state

CVE-2026-5027 · CVSS 8.8 HIGH · EPSS 31%

The 'POST /api/v2/files' endpoint does not sanitize the 'filename' parameter from the multipart form data, allowing an attacker to write files to arbitrary locations on the filesystem using path traversal sequences ('../').

Is CVE-2026-5027 exploited?

• Not in the CISA KEV catalog.
• EPSS puts exploitation in the next 30 days at 31%.
• Public exploit code: none found in monitored sources.
• Public detection rules exist.

Which products and versions are affected?

No affected package list recorded here yet.

Is there a patch?

No patch identifier recorded here yet.

What PlainSec published about CVE-2026-5027

• Langflow Bug Turns AI Builder Into Server Write Surface (2026-06-12)

Primary sources

• NVD record
• Nuclei template

What this record does not say

• No affected package data.
• No patch identifier.

KEV and EPSS are re-checked daily. Record last updated 2026-08-11.