Medium severity · published Aug 19, 2026
CVE-2026-76827
Search-indexer: search-indexer: update/delete operations not scoped to caller's cluster (cross-tenant data tampering)
6.8
CVSS
0.5%
EPSS
No
On KEV
Description
A flaw was found in search-indexer. This vulnerability allows a registered and authenticated managed cluster to tamper with or delete another cluster's indexed search data. This is possible because the delta-sync write paths in search-indexer do not properly restrict UPDATE/DELETE operations to data owned by the calling cluster. An attacker could exploit this by crafting specific user identifiers (UIDs) with a different cluster's prefix.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RH
Red Hat Advanced Cluster Management for Kubernetes 2.11 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Advanced Cluster Management for Kubernetes 2.13 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Advanced Cluster Management for Kubernetes 2.14 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Advanced Cluster Management for Kubernetes 2.15 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Advanced Cluster Management for Kubernetes 2.16 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Advanced Cluster Management for Kubernetes 2.17 · Red Hat
All versions, or not specified · source: vendor
Affected product
RH
Red Hat Advanced Cluster Management for Kubernetes 2.11
Red Hat
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-76827
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-76827
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:60386
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:60387
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:60388
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:60389
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:60390
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:60391
More from Red Hat Advanced Cluster Management for Kubernetes 2.11
9.9
CVE-2026-67567
Multicloud-operators-subscription: multicloud-operators-subscription: helmrelease chart applied with controller sa without gvk or namespace restriction
9.9
CVE-2026-70496
Search-v2-operator: search-v2-operator: operator clusterrole is cluster-admin equivalent via impersonate, rbac write, csr approve, and manifestwork
9.9
CVE-2026-66792
Multicloud-operators-subscription: multicloud-operators-subscription: isclusteradmin() trusts user-settable annotations on managed clusters
9.9
CVE-2026-72508
Multicloud-operators-subscription: multicloud-operators-subscription: hub and spoke serviceaccounts bound to wildcard rbac (*/*/*)
9.9
CVE-2026-72526
Multicloud-integrations: multicloud-integrations: pull-model propagation allows hub tenant to target arbitrary spoke cluster via unvalidated ocm-managed-cluster annotation