High-severity authorization bypass in widely deployed Cisco networking/security software that can affect core infrastructure; vendor released a hardening update.
CVE-2026-76530
Authorization bypass via non-canonical URL paths in Cisco products
Is CVE-2026-76530 being exploited?
Not confirmed. CVE-2026-76530 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.29% probability of exploitation in the next 30 days.
How severe is CVE-2026-76530?
CVE-2026-76530 is rated High with a CVSS score of 8.8. 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-2026-76530?
Yes. A fix has been recorded for CVE-2026-76530. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-76530 affect?
CVE-2026-76530 affects Cisco routers/switches (IOS, IOS XE, NX-OS), Cisco security appliances (ASA, Firepower), Cisco management and control-plane software. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-76530?
Apply Cisco's hardening update immediately and audit URL canonicalization and access controls.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authorization bypass via non-canonical URL paths enabling unauthorized access or privilege escalation on affected devices.
Immediate action required
- affected< 8.7.0
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.