CVE-2026-5027
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 ('../').
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 40.0%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.
Description
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 ('../').
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 39.97% probability · 99th percentile
- Public exploits
- 1 in Exploit-DB · first 31 August 2026
- CISA KEV
- Not listed
- Weakness
- CWE-22
- Affected
- langflow/langflow
- Source
- vulnreport@tenable.com
EPSS moved from 4.8% on 24 September 2026 to 40.0% on 30 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
Public exploits (1)
Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.
References
- https://www.tenable.com/security/research/tra-2026-26Vendor Advisory, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.