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CVE-2026-57489 – Authentication Bypass via Spoofed Proxy Header – FileRise < 3.16.0

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Summary

CVE-2026-57489 is an authentication bypass by spoofing (CWE-290) in FileRise, the self-hosted web file manager. Before version 3.16.0, the application trusts reverse-proxy identity headers without validating where the request came from, allowing an unauthenticated attacker to obtain a session as any account, including an administrator. The CVSS v3.1 base score is 8.1 (High).

Technical details

  • Root cause: In deployments with proxy-header authentication (AUTH_BYPASS) enabled, FileRise trusts the configured reverse-proxy identity header without checking that the request came from a trusted proxy (FR_TRUSTED_PROXIES).
  • Trigger conditions: Proxy-header authentication is enabled and the backend application port is directly reachable by the attacker, bypassing the reverse proxy.
  • Attack vector: Network. The attacker sends a request with a spoofed X-Remote-User header naming the target account. No credentials or user interaction are required.
  • Impact: The attacker obtains a session for any named account, including administrator accounts, without a password or MFA. This gives high impact on confidentiality, integrity and availability.

Affected software

  • FileRise (error311) versions prior to 3.16.0

Severity

  • CVSS v3.1 base score: 8.1 (High)
  • Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Upgrade FileRise to version 3.16.0 or later.
  • If you cannot patch immediately: Make sure the backend application port is reachable only through your trusted reverse proxy, for example with firewall or network-segmentation rules. If proxy-header authentication is not required, do not enable it.
  • Review access logs for unexpected sessions or requests carrying an X-Remote-User header from sources other than the reverse proxy.

References

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