Is CVE-2026-18560 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2026-18560 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

No public exploit code is known.

No fixed version is listed yet; check the vendor advisory for mitigations.

Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.

Medium

Improper order of authorisations in Mattermost GetFile API leads to an authenticated user to determine a post’s quarantined status

Published Oct 16, 2026 · Updated Oct 16, 2026

The full analysis for this CVE is not ready yet, so this page shows the scores and scope from the public record. How CVEs are selected

Routine patching

CVE-2026-18560 is a medium-severity vulnerability (CVSS 4.3).
It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.

CVSS

4.3

EPSS (30-day exploit likelihood)

n/a

Exploit maturity

None known

ATLAS score

n/a

Outside the curated set

FAQ

Improper order of authorisations in Mattermost GetFile API leads to an authenticated user to determine a post’s quarantined status
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.

Brandefense matches it against the products discovered on your perimeter and opens a finding the day a CVE like this is listed.