My Nextcloud is the only public facing service on the list. Is it sufficient to just disable public access via Nginx Proxy Manager and continue to permit local access for Nextcloud, or do I need to just shut down Nextcloud until it gets updated?

Oh, and here are the sources. From left to right, top to bottom:

1. (C86) [Pochi-Goya. (Pochi.)] Suzuya wa Sore o Gaman Dekinai (Kantai Collection -KanColle-) [English] [Facedesk] 139577 (page 8)
2. [Aoki Kanji] Dakishime Nasai!! | Gimme A Hug Ch.1-3 [English] [Sling] 110983 (page 19)
3. [Ikezaki Misa] Queen Slave (COMIC SIGMA 2014-09) [English] [Team Koinaka + PSYN] (page 22)
4. Looks like Metamorphosis
5. (C86) [Pochi-Goya. (Pochi.)] Suzuya wa Sore o Gaman Dekinai (Kantai Collection -KanColle-) [English] [Facedesk] 139577 (page 12, same sauce as #1)
6. Looks like Metamorphosis
7. (C87) [Pochi-Goya. (Pochi.)] Primarck (Kantai Collection -KanColle-) [English] [constantly] 129970 (page 6)