Actively exploited · CISA KEV · NVD published 2026-09-30
Actively exploitedCVE-2026-76504
A vulnerability in the API session-based authentication management of Cisco Catalyst SD-WAN Manager could allow an unauthenticated, remote attacker to access an affected system with privileges of the admin user. This vulnerability is due to improper handling of URI encoding in an HTTP request, which allows the request to bypass an authentication rule that is intended to restrict access to a specific API endpoint. An attacker could exploit this vulnerability by sending a crafted HTTP request to the API of the affected system. A successful exploit could allow the attacker to bypass authentication and gain access to the API as the admin user.
- KEV
- 1 day →First PoC
Signals
- Exploited in the wild
- Yesadded 2026-09-30 · due 2026-10-03. An observation, not a forecast.
- EPSS · 30-day forecast
- 2%Chance of exploitation in the next 30 days, 78th percentile of all CVEs. A forecast; KEV outranks it.
- CVSS · NVD · CRITICAL
- 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Internet exposure
- not stated by sourcesNo exposure census on this CVE's dispatches.
Exploits
1 known · links onlyGitHub PoCs · by trust, then stars1
EUVD-2026-89950 Improper Handling of URL Encoding (Hex Encoding) (CWE-177)
★ 2 · created 2026-09-30
Fake proof-of-concept repositories have been used to deliver malware to the researchers who run them. The trust verdict is our engine's heuristic over the repository (account age, what it ships, how its stars arrived); it is a reason to read the code first, not a finding about its author.
On the wire
1 dispatchWatch this one?
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