CVE-2026-103396CWE-863broken-access-control

CVE-2026-103396

Medium · published September 30, 2026

CVSS v3.1
4.3
EPSS
0%
Percentile
20.0
In the wild
Unconfirmed
What it is

bbs-go through 4.4.6 contains a permission bypass vulnerability in the AdminMiddleware authorization logic where the read-only dashboard.user.view permission rule matches the /api/admin/user/synccount endpoint before the intended dashboard.user.update rule. Authenticated users with only view permissions can call the synccount endpoint to trigger expensive full-table user recounts and cache invalidations, causing denial of service through repeated concurrent database operations.

The record
Technical detail
CVSS v3.1
4.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
CVSS v4.0
5.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
EPSS
0.00286 · 20.0th percentile
Weakness
CWE-863 · Incorrect Authorization
Published
2026-09-30T19:22Z
References (6)
https://github.com/mlogclub/bbs-go · [email protected]https://github.com/mlogclub/bbs-go/blob/v4.4.6/internal/handlers/admin/user_handlers.go#L47-L59 · [email protected]https://github.com/mlogclub/bbs-go/blob/v4.4.6/internal/permissions/admin_permission_registry.go#L59-L60 · [email protected]https://github.com/mlogclub/bbs-go/commit/97d0bb3dcbacd686fd5300295afbf4f4a5da7609 · [email protected]https://github.com/mlogclub/bbs-go/issues/303 · [email protected]https://www.vulncheck.com/advisories/bbs-go-through-4.4.6-incorrect-authorization-via-api-admin-user-synccount · [email protected]
EPSS history
Timeline
  • 02 OCT 03:41Z
    EPSS moved — → 1%
    epss
  • 30 SEP 14:48Z
    bbs-go through 4.4.6 Incorrect Authorization via /api/admin/user/synccount
    cvelistv5