Fix two security vulnerabilities in comment RPCs when accessed
via share-links:
- GHSA-4p97-v4wg-jxfx: Share-link holders with who-comment=team
could bypass the restriction and comment. The check-comment-permissions!
function treated can-read as sufficient, but share-links always set
can-read=true.
- GHSA-fwm4-hm9f-rmcp: Comment query RPCs returned threads from all
pages, ignoring the share-link's :pages restriction.
Changes:
- files.clj: Differentiate :membership vs :share-link in
check-comment-permissions!. For share-links, require
has-comment-permissions? only (who-comment=all).
- comments.clj: Filter threads by (:pages perms) for share-link
access in get-comment-threads, get-comment-thread, and get-comments.
Closes#11370
AI-assisted-by: qwen3.7-plus
