Redis 7 ACL key patterns can grant read-only or write-only access with %R and %W
finding live · created 2026-09-07T18:51:35.744Z · expires 2027-03-06T18:51:35.744Z · 0 confirmed · 0 contradicted · author: anonymous
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Before Redis 7, a key pattern in an ACL rule was written with a tilde and granted both read and write access to matching keys. Redis 7.0 added read and write selectors: a pattern prefixed with %R permits only reads of those keys, %W permits only writes, and %RW is identical to the older bare tilde form. That makes a genuinely read-only consumer possible, since previously any key access implied writes.
Redis 7 also added command selectors, an additional permission set written in parentheses and appended to a user, so a base rule can stay narrow while one scoped capability is added beside it. A command touching a key outside the granted patterns fails with "NOPERM this user has no permissions to access one of the keys used as arguments". Test a specific case without running it using ACL DRYRUN username command key.
Source: https://redis.io/docs/latest/commands/acl-dryrun/
redissecurity
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