Digest · Wednesday

Security digest: September 30, 2026

2 editorial briefs, 1 known exploited (cisa kev) addition and 1 critical advisory.

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Take stock

  • Act now: Cisco SD-WAN Manager CVE-2026-76504: Exploited Auth Bypass. Every organization running Cisco Catalyst SD-WAN Manager (vManage) on-prem or in a self-managed cloud, on any configuration, below the first fixed release for its train.
  • Act now: Zammad CVE-2026-102489/102490: Exploited RCE-to-Root Chain. Anyone self-hosting Zammad 6.3.0-6.5.4 (remote code execution), and anyone running Zammad from the DEB or RPM packages below 7.2.2 (local root escalation that completes the chain).
  • Do you run any of these? Cisco Catalyst SD-WAN Manager. They are being exploited in the wild (CISA KEV). Patch or mitigate if you do; CISA’s federal deadline is 2026-10-03.
  • npm: 1 critical advisory (next). Check with npm audit (or: npm ls <package>).
  • None of it touches your stack? Then there is nothing to do today. That is a result, not a failure to read carefully.

Editorial briefs

Act now

· Vulnerability · CVE-2026-76504

Cisco SD-WAN Manager CVE-2026-76504: Exploited Auth Bypass

If you run SD-WAN Manager on-prem, upgrade now and check the logs Cisco names; one crafted HTTP request gives an unauthenticated attacker admin over the controller for your whole WAN.

Must act: Every organization running Cisco Catalyst SD-WAN Manager (vManage) on-prem or in a self-managed cloud, on any configuration, below the first fixed release for its train.

Can relax: Customers on Cisco-managed SD-WAN Cloud (fixed in 20.15.605, no action needed) and organizations that don't use Catalyst SD-WAN.

  1. Identify every SD-WAN Manager instance and its release.
  2. Upgrade to the first fixed release for your train (20.9.10.1, 20.12.8.2, 20.15.6.1, 20.18.4.1, 26.1.2.1 or 26.2.1); migrate off anything older than 20.9.
  3. Block access to the Manager's web and API interfaces from the internet and other untrusted networks, per Cisco's SD-WAN hardening guide.

Read the brief →

Act now

· Vulnerability · CVE-2026-102489, CVE-2026-102490

Zammad CVE-2026-102489/102490: Exploited RCE-to-Root Chain

Self-hosted Zammad on 6.x is remotely exploitable and was used in a real breach: upgrade to 7.2.2 today (6.5.5 only as a stopgap), and patch DEB/RPM installs of any version to close the root escalation.

Must act: Anyone self-hosting Zammad 6.3.0-6.5.4 (remote code execution), and anyone running Zammad from the DEB or RPM packages below 7.2.2 (local root escalation that completes the chain).

Can relax: Zammad SaaS customers, and self-hosted 7.x installs running from source or the official container images, which neither bug can be used against as published.

  1. Find every self-hosted Zammad and its version and install type (dpkg -l zammad, rpm -q zammad, or the container image tag).
  2. Upgrade to Zammad 7.2.2; if you are stuck on 6.5, install 6.5.5 today and plan the move to 7.2.2.
  3. If you cannot upgrade a 6.x instance now, take it offline or put it behind a VPN, as DIVD advises.

Read the brief →

Known exploited (CISA KEV) 1

Added to CISA’s catalog on this day: confirmed exploitation in the wild. Due date = CISA’s deadline for US federal agencies.

CVEProduct and flawCISA due
CVE-2026-76504Cisco Catalyst SD-WAN Manager
Cisco Catalyst SD-WAN Manager Hex Encoding Vulnerability
2026-10-03

Critical advisories by ecosystem 1

GitHub-reviewed advisories rated critical, published this day (Pacific time).

npm 1

Check: npm audit (or: npm ls <package>)