CVE•Published 2026-04-06•Modified 2026-08-06•1 article on news•6 live references•NVD data
CVE-2026-3524Mattermost · Legal_hold
Vulnerability data via NVD (ingested)
CVSS v3.1
8.8
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS percentile
31
Exploit Prediction Scoring System · top 69% of all CVEs
Weaknesses (CWE)
Description
Mattermost Plugin Legal Hold versions <=1.1.4 fail to halt request processing after a failed authorization check in ServeHTTP which allows an authenticated attacker to access, create, download, and delete legal hold data via crafted API requests to the plugin's endpoints. Mattermost Advisory ID: MMSA-2026-00621
Timeline
Published 2026-04-06
Modified 2026-08-06
External references
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-2026-3524Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Mattermost Legal Hold"All exposed Mattermost Legal Hold instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Legal Hold"HTTP body or banner mentions "Legal Hold" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2026-3524Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-3524Censys host search filtered to this CVE id.
grep.app
CVE-2026-3524Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-3524GitHub code search for direct mentions.
Google dork
"CVE-2026-3524" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.