Assassin Personality: The assassin personality is causing other animations, such as jumping and call mount, to glitch. Source: https://forums.elderscrollsonline.com/en/discussion/270880/assassin-personality-animation-interfering-with-other-animations#latest
PC. Medicinal Use: Currently bugged and not working. Acknowledged by ZOS and fix planned in the next incremental. Source: https://forums.elderscrollsonline.com/en/discussion/comment/3055558#Comment_3055558
PS4. Werewolf + chair prop animation: If you use the chair prop emote while in werewolf form, the visual can glitch and the chair will become affixed to your backside https://youtube.com/watch?v=OaZPLPxtn14
PS4. Visual Bug - Horse riding animation when sprinting: There is a visual bug in which your character will drag their arse and pump their hands, as if riding a horse, when sprinting. https://youtube.com/watch?v=zP-8hgyzN6o

PC. Sanctum Ophidia - Troll AOEs: The visual effects for the AOE cast on players by trolls, i.e. the 'poop' is disappearing before the actual effect ends, resulting in players spreading the AOE when they think they are clear. Source: https://forums.elderscrollsonline.com/en/discussion/269156/zos-please-read-all-bugs-with-so-normal-and-hm-with-spoilers-hidden/p1
PC. Sanctum Ophidia - door before The Serpent: The door leading to the room where you fight The Serpent (final boss) closes and locks players out. This is not an issue unless players DC and spawn back in at the beginning of the trial, or if the group brings in a new player, in which case players can no longer get thru the door to participate in the final boss fight. Note that the door should shut and lock once the boss is aggro'd but open when the group either wipes or the boss is defeated. Source: https://forums.elderscrollsonline.com/en/discussion/269156/zos-please-read-all-bugs-with-so-normal-and-hm-with-spoilers-hidden/p1
Sanctum Ophidia - Ozara boss fight: During the Ozara boss encounter, players are having a hard time activating the Lightning Spear synergy to help get a team mate free from the Lightning Spear. This is causing players pinned by the spear to take excessive DoT, often resulting in a death. Furthermore, the Overcharger adds that spawn during this fight can glitch out and get stuck in walls, thus making them unable to be killed, which results in an excessive number of lightning AoEs being cast on players. Source: https://forums.elderscrollsonline.com/en/discussion/269156/zos-please-read-all-bugs-with-so-normal-and-hm-with-spoilers-hidden/p1
Sanctum Ophidia - Black Doors: All doorways in SO can glitch and become black, causing players to not be able to see what is thru the door, which is perilous in SO due to the number of holes which players can fall thru to their deaths. This glitch can occur anytime but seems consistent if players fall to their death, join a group late, or DC and respawn at the beginning.
Sanctum Ophidia - Start of Trial lag and Load Screen: Players going thru the door into the trial (not trial entrance but rather door that starts the trial timer) will often experience a load screen if they attempt to move immediately after loading in. this can be mitigated by not moving once you load in until you see the rock and other features in front of you fully form. However, should you move before the rock and other features fully render (a result of lag?), you will go into a load screen.
Aetherian Archive - Final boss not pulling: Once at The Mage (final boss), when clearing the adds prior to the boss coming down off the elevated platform to start the fight, if you knock an add off the platform/cliff (i.e. Wrecking Blow/Destructive Reach) then The Mage will not come down and the trial will glitch and progress will be halted. This can sometimes be fixed if the group wipes (jumps off the cliff) to reset the final fight.
PS4. VDSA Environmental Insta-Death: In the Veteran Dragon Star Arena (unknown if bug occurs in normal mode), players can back up too far on the platform where the boss spawns, basically touching the wall, and receive 'environmental dmg' resulting in an instant death. https://youtube.com/watch?v=66RNJhrAkSg

Mementos: Mementos currently are not working for some players. ZOS has acknowledged and offered this: "Thanks for the info, everyone. We've identified the issue, and are working on a fix. In the meantime, you can avoid this issue by not having a Memento active when you zone and/or hit a loading screen." Source: https://forums.elderscrollsonline.com/de/discussion/269603/mementos-broken#latest
Crafting Bags: Three glitches have been noted regarding crafting bags: (1) Inventory check glitches sometimes allowing you to Take, but not Take All when looting, even tho you have ample inventory space. (2) Minimum inventory space (player) is still required when deconstructing items or refining raw mats (3) Minimum inventory space is still required when retrieving mail. Source: https://forums.elderscrollsonline.com/en/discussion/270778/bug-report-some-minor-bugs-with-craft-bags-and-looting#latest
vMoL Trials sets dropping BoE: The four new trials sets dropping in Maw of Lorkhaj are dropping BoE if they have the new revamped traits. These sets should drop BoP. Source: https://forums.elderscrollsonline.com/de/discussion/269621/bind-on-pickup-trial-gear-gone-bind-on-equip
Vampires appear Mortal: Several costumes will cause the vampire visual effects to disappear, causing the player to appear mortal. Source: https://forums.elderscrollsonline.com/en/discussion/269302/vampire-skin-doesnt-display-when-wearing-disguise-visual-bug

PC. Cheat Engine: There is currently a known hack and blatant cheat using third party cheat engines. ZOS is already taking action against accounts and writing new code to both detect the use of, and counter the use of, CEs. However, this has reportedly been in game since its release and many players are accused of subtle cheating (i.e. making only small changes to regens, attack speed, global cooldowns, ult gain, etc). If you suspect someone of using a CE to cheat, please report them directly to ZOS. Video evidence helps
White Gold Tower - Adjudicator jail cells gap closer exploit: Players confined in one of the jail cells during the Adjudicator boss fight (1st boss) can use a gap closer to bypass the jail door. If the boss or adds are in range, players can gap close directly out of the jail cell without having to first pick the lock.
PS4. Sewers Pact Base Enemy Access: It is possible for members of other alliances to gain access to the Pact base in the sewers, via a hole in the wall, and kill players from behind the banker wall. Video documentation needed
PS4. Keep Hiding Spot & CQB AP Farm: It is sometimes possible to jump into the upper keep walls to hide during an enemy capture or to lure enemy players into a tight battle to farm AP. https://youtube.com/watch?v=jD0I1sT9mkY
PC. Templar Ultimate as a Zerg Buster: Templar healing ultimate flings people at super speed through walls, terrain, and occasionally even up in the air, and can be used as a Zerg buster and AP gathering device on stairs, towers, and any elevated surfaces. Also can and has been used to gain mass entry into keeps by utilizing the super speed no clip mode it basically enables for a few seconds on any enemy characters. Video detailing problem: https://twitch.tv/trixytricks/v/70296661 (more videos linked in post #25 of this thread). Issue was supposedly fixed in a hotfix patch on 6/18; need confirmation of fix. Source: https://forums.elderscrollsonline.com/en/discussion/270642/hotfix-6-8-16-alliance-war-fixes-pc-mac-only