CISA Adds One Known Exploited Vulnerability to Catalog
CISA added actively exploited Cisco Catalyst SD-WAN Manager flaw CVE-2026-76504 to the Known Exploited Vulnerabilities catalog.
CISA added CVE-2026-76504, a hex-encoding vulnerability in Cisco Catalyst SD-WAN Manager, to its Known Exploited Vulnerabilities Catalog based on evidence of active exploitation. The agency said this class of flaw is a frequent attack vector and poses significant risk to federal enterprises. Binding Operational Directive 26-04 requires Federal Civilian Executive Branch agencies to prioritize remediation of KEV-listed vulnerabilities on publicly exposed assets. CISA encouraged all organizations to remediate cataloged flaws using risk-based vulnerability management.
- CVE-2026-76504 affects Cisco Catalyst SD-WAN Manager.
- CISA cites evidence of active exploitation.
- BOD 26-04 requires rapid federal remediation of KEV entries.
- The issue is described as a hex-encoding vulnerability.
Vulnerabilities mentionedAll →
- CVE-2026-765049.8—Unauthenticated admin API auth bypass in Cisco Catalyst SD-WAN Managerpublished · Cisco Catalyst SD-WAN Manager KEV PoC
| CVE | Vulnerability | CVSS | EPSS | Flags | Affected | Exposure | Published |
|---|---|---|---|---|---|---|---|
| CVE-2026-76504 | Unauthenticated admin API auth bypass in Cisco Catalyst SD-WAN Manager Cisco Catalyst SD-WAN Manager has a critical flaw in how it manages API session authentication. Improper handling of URI encoding in an HTTP request can bypass an authentication rule that is supposed to restrict a specific API endpoint. An unauthenticated remote attacker can send a crafted HTTP request and gain access to the API with admin privileges, affecting confidentiality, integrity, and availability (CVSS 9.8). Organizations that run Catalyst SD-WAN Manager are affected; the provided data does not list vulnerable or fixed version ranges. No public proof-of-concept is known and the issue is not in CISA's Known Exploited Vulnerabilities catalog. |
Full article223 words · extracted from cisa.gov · click to collapse
CISA has added one new vulnerability to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation.
- CVE-2026-76504 Cisco Catalyst SD-WAN Manager Hex Encoding Vulnerability
This type of vulnerability is a frequent attack vector for malicious cyber actors and poses significant risks to the federal enterprise.
Binding Operational Directive (BOD) 26-04: Prioritizing Security Updates Based on Risk establishes vulnerability management requirements for Federal Civilian Executive Branch (FCEB) agencies. BOD 26-04 reinforces the importance of the KEV Catalog and requires federal agencies to prioritize rapid remediation of high-risk vulnerabilities, specifically those identified by Common Vulnerabilities and Exposures (CVEs) listed in CISA’s KEV Catalog on publicly exposed assets that grant total control of the asset post-exploitation, while deferring action for lower-risk vulnerabilities. BOD 26-04 further establishes basic expectations for when agencies must check whether threat actors compromised the system before the patch was applied.
While BOD 26-04 applies only to FCEB agencies, CISA encourages all organizations to adopt risk-based vulnerability management and prioritize remediation of KEV Catalog vulnerabilities. CISA will continue to add vulnerabilities to the catalog that meet the specified criteria.
Aware of an exploited vulnerability not currently listed in the KEV Catalog? Submit it for potential addition through CISA’s KEV Nomination Form. Potential KEV additions must have a CVE ID, evidence of exploitation, and clear mitigation guidance.
Text extracted automatically; images, tables and formatting may be missing. Original: https://www.cisa.gov/news-events/alerts/2026/09/30/cisa-adds-one-known-exploited-vulnerability-catalog