CVE-2026-52799
Summary
In Gogs 0.14.1, GET /attachments/:uuid returns the raw attachment file without verifying whether the requester has view permission for the associated Issue/Comment/Release or the repository.
In a test environment with REQUIRE_SIGNIN_VIEW = false, we confirmed that an unauthenticated user can download attachments belonging to a private repository.
Description
/attachments/:uuid retrieves an attachment record solely by the UUID provided in the URL and returns the corresponding local file without performing any authorization checks against the attachment’s parent object (Issue/Comment/Release) or the repository it belongs to. As a result, even attachments under private repositories can be downloaded by an unauthenticated user (or a user without proper permissions) as long as the UUID is known.
Relevant code (internal/cmd/web.go:306):
m.Get("/attachments/:uuid", func(c *context.Context) {
attach, err := database.GetAttachmentByUUID(c.Params(":uuid"))
if err != nil {
c.NotFoundOrError(err, "get attachment by UUID")
return
} else if !com.IsFile(attach.LocalPath()) {
c.NotFound()
return
}
fr, err := os.Open(attach.LocalPath())
if err != nil {
c.Error(err, "open attachment file")
return
}
defer fr.Close()
c.Header().Set("Content-Security-Policy", "default-src 'none'; style-src 'unsafe-inline'; sandbox")
c.Header().Set("Cache-Control", "public,max-age=86400")
c.Header().Set("Content-Disposition", fmt.Sprintf(inline; filename="%s", attach.Name))
if _, err = io.Copy(c.Resp, fr); err != nil {
c.Error(err, "copy from file to response")
return
}
})
The UUID lookup itself also performs no validation tied to repository visibility or user permissions. Authorization is not enforced at this layer.
Relevant code (internal/database/attachment.go:124):
// GetAttachmentByUUID returns attachment by given UUID.
func GetAttachmentByUUID(uuid string) (*Attachment, error) {
return getAttachmentByUUID(x, uuid)
}
Preconditions
- The attacker knows the target attachment’s UUI
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Exploitation outlook
- Low exploitation risk0.38% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 31% of all EPSS-scored CVEs.
Advisory coverage (1)
- highGHSA-p9f5-h3rx-j5qw: Gogs Missing Authorization in Attachment Downloadghsa · 2026-06-22
External references
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[](https://www.csirts.com/cve/CVE-2026-52799)