Authentication Bypass in Zerobyte API Allows Unauthorized Access

Publication date: 2025-12-17

Last updated on: 2026-03-05

Assigner: GitHub, Inc.

Description

Zerobyte is a backup automation tool Zerobyte versions prior to 0.18.5 and 0.19.0 contain an authentication bypass vulnerability where authentication middleware is not properly applied to API endpoints. This results in certain API endpoints being accessible without valid session credentials. This is dangerous for those who have exposed Zerobyte to be used outside of their internal network. A fix has been applied in both version 0.19.0 and 0.18.5. If immediate upgrade is not possible, restrict network access to the Zerobyte instance to trusted networks only using firewall rules or network segmentation. This is only a temporary mitigation; upgrading is strongly recommended.

CVSS Scores

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Meta Information

Published

2025-12-17

Last Modified

2026-03-05

Generated

2026-07-06

AI Q&A

2025-12-18

EPSS Evaluated

2026-07-05

NVD

CVE-2025-68435

Affected Vendors & Products

Vendor	Product	Version / Range
nicotsx	zerobyte	to 0.18.5 (exc)
nicotsx	zerobyte	0.19.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-305	The authentication algorithm is sound, but the implemented mechanism can be bypassed as the result of a separate weakness that is primary to the authentication error.

Attack-Flow Graph

Executive Summary

This vulnerability in Zerobyte versions prior to 0.18.5 and 0.19.0 is an authentication bypass where the authentication middleware is not properly applied to some API endpoints. This means certain API endpoints can be accessed without valid session credentials, allowing unauthorized users to interact with the system.

Impact Analysis

The vulnerability can allow unauthorized access to Zerobyte's API endpoints, potentially exposing sensitive backup automation functions to attackers. This is especially dangerous if Zerobyte is exposed outside of a trusted internal network, as attackers could exploit this to compromise data confidentiality and integrity.

Mitigation Strategies

If immediate upgrade to Zerobyte version 0.18.5 or 0.19.0 is not possible, restrict network access to the Zerobyte instance to trusted networks only using firewall rules or network segmentation. Upgrading to a fixed version is strongly recommended as a permanent solution.

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