CVE-2026-78433 Gitea private attachment disclosure through repository mismatch
Unauthenticated attackers can access private attachments if they know the UUID, due to a missing cross-repository ownership check in Gitea.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-78433?
CVE-2026-78433 is a medium-severity missing authorization vulnerability in Gitea, published on 14 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-78433?
How do I fix CVE-2026-78433?
No fix has been published for CVE-2026-78433 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-78433 being exploited?
There is no known exploitation of CVE-2026-78433 in the wild and no public exploit code.
Sources
Also known as GHSA-frpv-2xgv-wxpq, GHSA-w7q4-4ccp-896r.