Unauthenticated remote admin access to Cisco Catalyst SD‑WAN Manager can let attackers control enterprise WAN infrastructure; widely used networking product with high-impact consequences.
CVE-2026-76504
Unauthenticated API auth bypass in Cisco SD‑WAN Manager allows admin access
Is CVE-2026-76504 being exploited?
Yes. CVE-2026-76504 appears in CISA's Known Exploited Vulnerabilities catalog, which means exploitation in the wild has been confirmed and reported. Treat it as active rather than theoretical, and patch it ahead of higher-scoring vulnerabilities that carry no exploitation evidence.
How severe is CVE-2026-76504?
CVE-2026-76504 is rated Critical with a CVSS score of 9.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-76504?
Not known from our data. No patch reference has been recorded for CVE-2026-76504, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-76504 affect?
CVE-2026-76504 affects Cisco Catalyst SD‑WAN Manager (API session-based auth). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-76504?
Isolate affected systems, restrict API access, and apply Cisco advisory mitigations/updates ASAP
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote attacker can bypass API auth via crafted URI-encoded HTTP request and gain admin privileges, enabling full control of SD‑WAN Manager.
Immediate action required
- affected18.3.6
- affected18.3.7
- affected18.3.8
- affected17.2.10
- affected18.3.6.1
- affected18.2.0
- affected18.4.3
- affected18.4.1
- affected17.2.8
- affected18.3.3.1
- affected18.4.0
- affected18.3.1
- affected17.2.6
- affected17.2.9
- affected18.3.4
- affected17.2.5
- affected18.3.1.1
- affected18.3.5
- affected18.4.0.1
- affected18.3.3
- affected17.2.7
- affected17.2.4
- affected18.3.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.