Unauthenticated FS Write via /save-document in Feast Feature Server
CVE-2026-23537 Published on July 1, 2026
Feast: unauthenticated arbitrary file write
A vulnerability has been identified in the Feast Feature Servers `/save-document` endpoint that allows an unauthenticated remote attacker to write arbitrary JSON files to the server's filesystem. Although the system attempts to restrict file locations, these protections can be bypassed, enabling an attacker to overwrite vital application configurations or startup scripts. Because this flaw requires no credentials or special privileges, any attacker with network access to the server can potentially compromise the integrity of the system. This could lead to unauthorized system modifications, denial of service through disk exhaustion, or potential remote code execution.
Vulnerability Analysis
CVE-2026-23537 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, a high impact on integrity and availability.
Timeline
Reported to Red Hat.
Made public. 66 days later.
Weakness Type
What is an AuthZ Vulnerability?
The software does not perform an authorization check when an actor attempts to access a resource or perform an action.
CVE-2026-23537 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2026-23537
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Affected Versions
Feast Feature Server:- Before 0.59.0 is affected.