---
id: "CVE-2026-76497"
kind: "vulnerability"
aliases: ["CVE-2026-76497"]
title: "Cisco Expressway: insecure temporary files flaw from internal security review"
severity: "medium"
cvss: 6.6
epss: 0.00116
exploited: false
status: "open"
category: "vendor"
products: []
ecosystems: []
tags: ["cisco", "expressway", "self-hosted", "vendor"]
not_affected_if: []
published_at: "2026-10-21T17:19:09+00:00"
first_seen_at: "2026-10-23T21:57:29+00:00"
updated_at: "2026-10-25T03:46:45+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-76497", "first_seen_at": "2026-10-23T21:57:29+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-76497", "first_seen_at": "2026-10-24T13:15:54+00:00"}]
---

# Cisco Expressway: insecure temporary files flaw from internal security review

Cisco Expressway Series contains multiple internally found flaws tied to insecure temporary files (CWE-377), fixed in hardening releases. The sources do not say what an attacker gains beyond local file exposure or which releases are fixed.

_Summary, check and fix written by a model from the sources; labelled as such._

## Fix

- Upgrade Cisco Expressway to the fixed release named in Cisco's advisory (version unknown from sources)

## Timeline

- 2026-10-23T21:57:29+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-76497
- 2026-10-24T13:15:54+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-76497

## From the sources

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Expressway Series software engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities.  

The vulnerabilities tracked by CVE-2026-76497 are related to issues concerning insecure temporary files that are grouped under the Common Weakness Enumeration (CWE) Base CWE-377.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_