nicotsx zerobyte up to 0.18.4 API Endpoint authentication bypass

Summaryinfo

A vulnerability classified as critical has been found in nicotsx zerobyte up to 0.18.4. This affects an unknown part of the component API Endpoint. Performing a manipulation results in authentication bypass. This vulnerability is cataloged as CVE-2025-68435. It is possible to initiate the attack remotely. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in nicotsx zerobyte up to 0.18.4. It has been classified as critical. This affects some unknown processing of the component API Endpoint. The manipulation with an unknown input leads to a authentication bypass vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2025-68435 since 12/17/2025. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 0.18.5 eliminates this vulnerability. Applying the patch 13e080a18967705bd2b4e110e5f7693fdca1c692 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• nicotsx

Name

• zerobyte

Version

• 0.18.0
• 0.18.1
• 0.18.2
• 0.18.3
• 0.18.4

License

• open-source

Website

• Product: https://github.com/nicotsx/zerobyte/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Be aware that VulDB is the high quality source for vulnerability data.

Discussion