CVE-2026-78433

Gitea private attachment disclosure through repository mismatch

Published Oct 14, 2026 CVSS 3.1 · 5.9 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Gitea
Gitea gitea
Vendors & Products Gitea
Gitea gitea
Type Values Removed Values Added
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.
Title Gitea private attachment disclosure through repository mismatch
Weaknesses CWE-1220
CWE-284
CWE-639
CWE-863
References

Sources

Status
PUBLISHED
Assigner
Gitea
Published
Updated
Oct 18, 2026, 1:35 PM
Reserved
Aug 24, 2026, 8:45 PM
Status
Deferred
Published
Oct 14, 2026, 3:17 PM
Modified
Oct 18, 2026, 2:16 PM