diff --git a/crates/jmap/src/calendar_event/set.rs b/crates/jmap/src/calendar_event/set.rs
index 4e18888c..74b74119 100644
--- a/crates/jmap/src/calendar_event/set.rs
+++ b/crates/jmap/src/calendar_event/set.rs
@@ -38,7 +38,10 @@ use jmap_proto::{
 use jmap_tools::{JsonPointerHandler, JsonPointerItem, Key, Map, Value};
 use std::{borrow::Cow, str::FromStr};
 use store::{
-    ValueKey, ahash::AHashSet, roaring::RoaringBitmap, write::{AlignedBytes, Archive, BatchBuilder, now, serialize::rkyv_deserialize}
+    ValueKey,
+    ahash::AHashSet,
+    roaring::RoaringBitmap,
+    write::{AlignedBytes, Archive, BatchBuilder, now, serialize::rkyv_deserialize},
 };
 use trc::AddContext;
 use types::{
@@ -802,6 +805,29 @@ fn update_calendar_event<'x>(
                     .with_property(property)
                     .with_description("Invalid value."));
             }
+            (
+                property @ (JSCalendarProperty::Locations | JSCalendarProperty::Participants),
+                Value::Object(values),
+            ) => {
+                for (_, value) in values.iter() {
+                    if let Some(values) = value
+                        .as_object_and_get(&Key::Property(JSCalendarProperty::Links))
+                        .and_then(|v| v.as_object())
+                    {
+                        for (_, value) in values.iter() {
+                            if value.as_object().is_some_and(|v| {
+                                v.keys()
+                                    .any(|k| matches!(k, Key::Property(JSCalendarProperty::BlobId)))
+                            }) {
+                                return Err(SetError::invalid_properties()
+                                    .with_property(property)
+                                    .with_description("blobIds in links is not supported."));
+                            }
+                        }
+                    }
+                }
+                entries.insert(property, Value::Object(values));
+            }
             (property, value) => {
                 if let (JSCalendarProperty::ShowWithoutTime, Value::Bool(set)) = (&property, &value)
                 {
diff --git a/crates/jmap/src/contact/set.rs b/crates/jmap/src/contact/set.rs
index 110f022e..b4b8e416 100644
--- a/crates/jmap/src/contact/set.rs
+++ b/crates/jmap/src/contact/set.rs
@@ -17,7 +17,12 @@ use jmap_proto::{
     types::state::State,
 };
 use jmap_tools::{JsonPointerHandler, JsonPointerItem, Key, Value};
-use store::{ValueKey, ahash::AHashSet, roaring::RoaringBitmap, write::{AlignedBytes, Archive, BatchBuilder}};
+use store::{
+    ValueKey,
+    ahash::AHashSet,
+    roaring::RoaringBitmap,
+    write::{AlignedBytes, Archive, BatchBuilder},
+};
 use trc::AddContext;
 use types::{
     acl::Acl,
@@ -468,6 +473,19 @@ fn update_contact_card<'x>(
                 }
                 entries = js_contact.0.as_object_mut().unwrap();
             }
+            (JSContactProperty::Media, Value::Object(media)) => {
+                for (_, value) in media.iter() {
+                    if value.as_object().is_some_and(|v| {
+                        v.keys()
+                            .any(|k| matches!(k, Key::Property(JSContactProperty::BlobId)))
+                    }) {
+                        return Err(SetError::invalid_properties()
+                            .with_property(JSContactProperty::Media)
+                            .with_description("blobIds in media is not supported."));
+                    }
+                }
+                entries.insert(JSContactProperty::Media, Value::Object(media));
+            }
             (property, value) => {
                 entries.insert(property, value);
             }