High priorityDisclosed

Advisory · CVE-2026-76468

Cisco Meraki hardening release fixes input-validation flaws up to CVSS 8.2

Cisco's October 2026 Meraki hardening release addresses internally found improper-input-validation issues grouped under CVE-2026-76468, rated 8.2.

Advisory published October 7, 2026Independent summary
Vendor
Cisco
Product
Cisco Meraki
Identifier / CWE
CVE-2026-76468
CWE-20
Action timing
Immediate
ELI5

Explain it like I’m five

Cisco's cloud-managed network boxes were too trusting of the data they received, including sneaky file paths. The update teaches them to check first.

SIMPLIFIED_ATTACK_PATH04 STEPS
  1. 01Internal review

    Cisco's networking engineering team ran a comprehensive internal security review of the Meraki OS portfolio.

  2. 02CVE grouping

    Improper-input-validation issues (CWE-20 pillar: input validation, path traversal, external path control) are grouped under CVE-2026-76468, with a maximum CVSS of 8.2.

  3. 03Exposure

    The vulnerabilities affect Meraki Campus Gateways, MR wireless access points, MV smart cameras, and MX security and SD-WAN appliances, regardless of device configuration.

  4. 04Hardened release

    Cisco released hardened software that addresses the vulnerabilities; there are no workarounds.

What happened

On October 7, 2026, Cisco published a Meraki security hardening release. CVE-2026-76468 groups improper-input-validation issues (CWE-20 pillar, covering input validation, path traversal, and external path control) with a maximum CVSS base score of 8.2, exploitable over the network with no privileges and no user interaction. The vulnerabilities affect Meraki Campus Gateways, MG cellular gateways, MR wireless access points, MS series switches, MV smart cameras, and MX security and SD-WAN appliances, regardless of device configuration.

Cisco states the flaws were found during internal testing and are not known to be actively exploited. There are no workarounds. Fixed releases per the advisory include Campus Gateway 32.2.5 / 33.1.4, MG 26.1.4, MR 30.7.3 / 31.1.8.1 / 32.2.5 / 33.1.3, MS 18.1.9 (plus IOS XE trains), MV 8.0, and MX 19.2.9 / 26.1.7 / 26.2.3, with some fixes landing later in October or mid-November 2026.

What to do

  1. Check the Meraki dashboard for devices on affected firmware trains.
  2. Schedule upgrades to the fixed releases in the advisory; note a few fixed releases arrive later in October or mid-November, so plan a second pass.
  3. There are no workarounds, so keep management access to Meraki devices restricted in the meantime.
  4. Confirm firmware versions after upgrading.

Management note

Meraki fleets are often large and cloud-managed, which makes this easier: the dashboard shows exactly what runs where. The risk is breadth rather than depth, a widely deployed input-validation class with no workaround, so use the dashboard to drive a systematic upgrade rather than spot-fixing.