CVE•Published 2026-09-17•Modified 2026-10-13•0 articles on news•3 live references•NVD data

CVE-2026-75588Mattermost · Mattermost_desktop

Vulnerability data via NVD (ingested)

CVSS v3.1

2.6

LOW

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:N

EPSS percentile

Exploit Prediction Scoring System · top 89% of all CVEs

Weaknesses (CWE)

CWE-1287Improper Validation of Specified Type of Input

Description

Mattermost Desktop App versions <=6.2 6.2.2.0 fail to validate the URL scheme when checking whether a target URL is internal to the connected server, which allows a network-positioned attacker to load a plugin popout window over an insecure connection via a link using a downgraded URL scheme. Mattermost Advisory ID: MMSA-2026-00717

Timeline

Published 2026-09-17

Modified 2026-10-13

External references

NVD MITRE VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-75588

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Mattermost Mattermost Desktop"

All exposed Mattermost Mattermost Desktop instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Mattermost Desktop"

HTTP body or banner mentions "Mattermost Desktop" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-75588