User without parent group permission cannot assign epic to issue.

Summary

A user without permission in the group but with permission in the project, cannot assign epic to issue.

Steps to reproduce

1. Create a group G
2. Create a project P
3. Add an epic (E) to G
4. Add a user (U) as a member of P
5. Open an issue (I) in P
6. After the I is open, verify that E shows up in the epic drop-down (edit)
7. Try assigning E to I

Example Project

No can do without paying for Epics here.

What is the current bug behavior?

Assigning/removing an epic form a group the user doesn't have permissions to a project (inside said group) the user has permission results in an error.

What is the expected correct behavior?

The user should be able to assign the issue to its project's parent group epic. The user can already see the epic regardless of not having access to the group (what makes sense).

Relevant logs and/or screenshots

Output of checks

Unable to try. Behind the Ultimate wall.

Results of GitLab environment info

Expand for output related to GitLab environment info

System information
System:         Ubuntu 16.04
Proxy:          no
Current User:   git
Using RVM:      no
Ruby Version:   2.6.5p114
Gem Version:    2.7.10
Bundler Version:1.17.3
Rake Version:   12.3.3
Redis Version:  5.0.7
Git Version:    2.24.1
Sidekiq Version:5.2.7
Go Version:     unknown
GitLab information
Version:        12.8.1-ee
Revision:       13bae744d5c
Directory:      /opt/gitlab/embedded/service/gitlab-rails
DB Adapter:     PostgreSQL
DB Version:     10.12
URL:            https:// <do you need it?>
HTTP Clone URL: https:// <do you need it?>
SSH Clone URL:  git@<do you need it?>:some-group/some-project.git
Elasticsearch:  no
Geo:            no
Using LDAP:     yes
Using Omniauth: yes
Omniauth Providers:
GitLab Shell
Version:        11.0.0
Repository storage paths:

• default: /var/opt/gitlab/git-data/repositories GitLab Shell path: /opt/gitlab/embedded/service/gitlab-shell Git: /opt/gitlab/embedded/bin/git

Results of GitLab application Check

Expand for output related to the GitLab application check

Checking GitLab subtasks ...
Checking GitLab Shell ...
GitLab Shell: ... GitLab Shell version >= 11.0.0 ? ... OK (11.0.0)
Running /opt/gitlab/embedded/service/gitlab-shell/bin/check
Internal API available: OK
Redis available via internal API: OK
gitlab-shell self-check successful
Checking GitLab Shell ... Finished
Checking Gitaly ...
Gitaly: ... default ... OK
Checking Gitaly ... Finished
Checking Sidekiq ...
Sidekiq: ... Running? ... yes
Number of Sidekiq processes ... 1
Checking Sidekiq ... Finished
Checking Incoming Email ...
Incoming Email: ... Reply by email is disabled in config/gitlab.yml
Checking Incoming Email ... Finished
Checking LDAP ...
LDAP: ... Server: ldapmain
LDAP authentication... Success
LDAP users with access to your GitLab server (only showing the first 100 results)
User output sanitized. Found 100 users of 100 limit.
Checking LDAP ... Finished
Checking GitLab App ...
Git configured correctly? ... yes
Database config exists? ... yes
All migrations up? ... yes
Database contains orphaned GroupMembers? ... no
GitLab config exists? ... yes
GitLab config up to date? ... yes
Log directory writable? ... yes
Tmp directory writable? ... yes
Uploads directory exists? ... yes
Uploads directory has correct permissions? ... yes
Uploads directory tmp has correct permissions? ... yes
Init script exists? ... skipped (omnibus-gitlab has no init script)
Init script up-to-date? ... skipped (omnibus-gitlab has no init script)
Projects have namespace: ...
52/1 ... yes
228/4 ... yes
52/5 ... yes
16/56 ... yes
16/57 ... yes
16/58 ... yes
16/59 ... yes
16/60 ... yes
15/62 ... yes
15/63 ... yes
15/64 ... yes
15/65 ... yes
15/66 ... yes
15/67 ... yes
15/68 ... yes
15/69 ... yes
15/70 ... yes
15/71 ... yes
15/72 ... yes
42/73 ... yes
42/74 ... yes
3/76 ... yes
88/77 ... yes
88/78 ... yes
88/79 ... yes
88/80 ... yes
88/81 ... yes
88/82 ... yes
88/83 ... yes
88/84 ... yes
88/85 ... yes
102/86 ... yes
101/87 ... yes
101/216 ... yes
101/217 ... yes
101/218 ... yes
101/219 ... yes
101/220 ... yes
101/221 ... yes
101/222 ... yes
101/223 ... yes
101/224 ... yes
101/225 ... yes
101/226 ... yes
101/227 ... yes
101/228 ... yes
101/229 ... yes
101/231 ... yes
101/232 ... yes
101/233 ... yes
101/234 ... yes
101/235 ... yes
101/236 ... yes
101/237 ... yes
101/238 ... yes
101/239 ... yes
101/240 ... yes
101/241 ... yes
101/243 ... yes
101/244 ... yes
101/245 ... yes
101/246 ... yes
101/247 ... yes
101/248 ... yes
101/249 ... yes
101/250 ... yes
101/251 ... yes
101/252 ... yes
101/253 ... yes
101/254 ... yes
101/255 ... yes
101/256 ... yes
101/257 ... yes
101/258 ... yes
101/259 ... yes
101/260 ... yes
101/261 ... yes
101/262 ... yes
101/263 ... yes
101/264 ... yes
101/265 ... yes
101/266 ... yes
101/267 ... yes
114/270 ... yes
114/271 ... yes
114/272 ... yes
114/273 ... yes
110/274 ... yes
110/275 ... yes
110/279 ... yes
135/281 ... yes
141/283 ... yes
141/284 ... yes
141/285 ... yes
42/286 ... yes
101/287 ... yes
141/288 ... yes
143/289 ... yes
143/290 ... yes
136/291 ... yes
136/292 ... yes
101/293 ... yes
145/294 ... yes
136/296 ... yes
136/298 ... yes
198/299 ... yes
135/300 ... yes
42/301 ... yes
192/303 ... yes
155/304 ... yes
155/305 ... yes
155/306 ... yes
155/307 ... yes
155/308 ... yes
155/309 ... yes
137/310 ... yes
192/311 ... yes
192/312 ... yes
192/313 ... yes
135/314 ... yes
101/315 ... yes
40/316 ... yes
193/317 ... yes
195/318 ... yes
193/319 ... yes
193/320 ... yes
193/321 ... yes
195/322 ... yes
138/323 ... yes
195/324 ... yes
193/325 ... yes
193/326 ... yes
42/327 ... yes
198/328 ... yes
198/329 ... yes
198/330 ... yes
198/331 ... yes
198/332 ... yes
198/333 ... yes
192/335 ... yes
192/336 ... yes
206/338 ... yes
206/339 ... yes
206/340 ... yes
206/341 ... yes
206/342 ... yes
206/343 ... yes
206/344 ... yes
127/345 ... yes
137/346 ... yes
224/347 ... yes
203/349 ... yes
227/350 ... yes
227/351 ... yes
228/352 ... yes
231/353 ... yes
231/354 ... yes
231/355 ... yes
224/356 ... yes
228/357 ... yes
193/371 ... yes
234/372 ... yes
228/374 ... yes
42/375 ... yes
228/376 ... yes
228/377 ... yes
135/378 ... yes
228/379 ... yes
Redis version >= 2.8.0? ... yes
Ruby version >= 2.5.3 ? ... yes (2.6.5)
Git version >= 2.22.0 ? ... yes (2.24.1)
Git user has default SSH configuration? ... yes
Active users: ... 72
Is authorized keys file accessible? ... yes
Elasticsearch version 5.6 - 6.x? ... skipped (elasticsearch is disabled)
Checking GitLab App ... Finished
Checking GitLab subtasks ... Finished

Possible fixes