CVE-2026-76468 covers improper input validation fixed in Cisco's Meraki security hardening release of October 2026. The record scores it 8.2 High. Cisco lists fixed software for Campus Gateway, MG, MR, MS, MV and MX, offers no workarounds, and says it is not aware of malicious use.
What's affected
Cisco's advisory says the issues affect Meraki products regardless of device configuration: Campus Gateways, MG Cellular Gateways, MR Wireless Access Points, MS Series Switches, MV Smart Cameras and MX Security and SD-WAN Appliances. The record itself lists no product.
First fixed releases from the advisory (revision 1.2, last updated 15 October 2026):
- Campus Gateway: 32.2.5 (late October 2026), 33.1.4 (mid November 2026)
- MG: 4.1.4 for MG21/E only (late October 2026), 26.1.4
- MR: 30.7.3, 31.1.8.1, 32.2.5, 33.1.3
- MS: 18.1.9 for the 17.2 and 18.1 lines, IOS XE 17.15.6, 17.18.4.1, 26.1.2
- MV: 8.0 for the 7 line
- MX: 18.107.14, 19.2.9 (recommended only for Z3 devices), 26.1.7, 26.2.3
Some of these dates were still in the future when the advisory was last updated, so check availability before you plan a window.
Where sources differ. The advisory as a whole is rated Critical with a base score of 9.6, which comes from a different CVE in the same bundle (CVE-2026-76464, a memory buffer class). This CVE's own highest score in the advisory table is 8.2, which matches the record's 8.2 High. Cisco also states that each score is the maximum for the most severe underlying bug in that weakness group, so treat the single number as a ceiling for the class, not a description of one bug.
How to check if you're exposed
Use the Meraki Dashboard to see the firmware version on each device, then compare it with the table above for the product family. Cisco says all configurations are affected, so there is nothing to exclude by settings. Make a list by product line, since the fix versions differ for MR, MS, MX, MG, MV and Campus Gateway.
For cloud-managed Catalyst devices, Cisco points to its separate IOS XE hardening advisory for August 2026. Fixed IOS XE releases are available through the Meraki Dashboard.
What to do now
- Inventory Meraki devices by family and current firmware.
- Upgrade each device to at least the first fixed release for its line. Where the fix date is still ahead, schedule it and keep a note.
- If a recommended build such as 18.107.14 or 19.2.9 does not appear as an update option, Cisco says to contact Meraki Technical Support.
- Do not rely on a workaround. Cisco lists none.
- Read the advisory again after any update, since Cisco has already revised it twice.
Why it matters
Cisco says engineering teams found these issues in internal testing, using standard processes as well as frontier AI models, and grouped them by weakness class under one CVE each. This CVE is the input validation group, filed under CWE-20, which Cisco describes as covering input validation, path traversal and external path control.
Grouping is a change for defenders. One CVE may stand for several separate bugs, so the score is a ceiling and the right response is to move to the fixed release, not to reason about one flaw. Cisco says it is not aware of public announcements or malicious use, and the record does not mark this as a CISA KEV entry.
Quick check
Is this exploited in the wild?
Cisco says its PSIRT is not aware of public announcements or malicious use. The record does not mark it as a CISA KEV entry.
Why does the advisory say Critical while the record says High?
The advisory's 9.6 comes from another CVE in the bundle. This CVE's own score in the advisory is 8.2, the same as the record.
Sources
Last reviewed: 18 October 2026.
