Vulnerability · Published Dec 17, 2025 · Assigned by GitHub_M

CVE-2025-68435Zerobyte has Authentication Bypass by Primary Weakness

Critical 9.1

In plain English

A critical-severity security flaw in zerobyte from nicotsx. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities).

Severity (CVSS 3.1)9.1Critical

Exploit odds (30 days)0.4%top 64.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
nicotsx	zerobyte	< 0.18.5

Weakness: CWE-305 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References

https://github.com/nicotsx/zerobyte/security/advisories/GHSA-x539-c98q-38gv x_refsource_CONFIRM
https://github.com/nicotsx/zerobyte/issues/161 x_refsource_MISC
https://github.com/nicotsx/zerobyte/commit/13e080a18967705bd2b4e110e5f7693fdca1c692 x_refsource_MISC