CVE-2026-76236High▾ Twilightstigmem-node before 0.9.0a12 contains a cross-tenant broken object level authorization (BOLA) flaw in the RTBF (right-to-be-forgotten) tombstone mechanism. issue_tombstone defaulted the tenant to "default" instead of the caller's tenant,…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.
Exploit-prediction probability, daily snapshots since Aug 20.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.3%
Last analysed / modified upstream
stigmem-node before 0.9.0a12 contains a cross-tenant broken object level authorization (BOLA) flaw in the RTBF (right-to-be-forgotten) tombstone mechanism. issue_tombstone defaulted the tenant to "default" instead of the caller's tenant, allowing deletion records to be written to the wrong tenant, and the read-suppression path (_get_tombstone_filter and the tombstone scope cache) lacked a tenant_id predicate, so tombstone suppression was applied tenant-blind across fact queries and provenance reads. As a result, a tenant's deletion could be attributed to the wrong tenant and tombstone suppression could either hide facts belonging to other tenants or fail to hide facts within the correct tenant, undermining data isolation and RTBF guarantees. The issue is exploitable only on multi-tenant deployments running the opt-in stigmem-plugin-multi-tenant; single-tenant deployments are unaffected. Fixed in 0.9.0a12.
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Affected packages:
stigmem-node < 0.9.0a12Patched in:
stigmem-node 0.9.0a12Connected by shared product, vendor, weakness, or advisory.
GHSA-x26h-xmv8-gxf7Highstigmem-node: RTBF tombstones are mis-attributed and suppress reads tenant-blind (cross-tenant BOLA)
CVE-2026-76237Highstistigmem-node: quarantine review surface exposes and mutates other tenants' quarantined facts (cross-tenant BOLA)
CVE-2026-76238Highstigmem-node: decay sweep expires and counts facts across all tenants (cross-tenant BOLA)
GHSA-xhv3-q4xx-349rHighstistigmem-node: quarantine review surface exposes and mutates other tenants' quarantined facts (cross-tenant BOLA)
CVE-2026-76245Highstigmem (pip package stigmem-node) version 0.9.0a1 contains a timestamp-handling mismatch in federation peer-token validation that can cause valid peer tokens to be incorrectly treated as expired
CVE-2026-76241Highstigmem-node 0.9.0a1 allows plugin signature enforcement to be disabled via a single configuration flag without a second explicit acknowledgment