CVE-2026-86348

DiscoveredSep 14, 2026UpdatedSep 16, 2026

Mattermost versions <=11.9 11.0.9 11.4.8 11.7.7 10.22.11.0 fail to recover from handler panics, which allows an authenticated user to crash the plugin via a post-action request with an unexpected field type.. Mattermost Advisory ID: MMSA-2026-00701

View graph Watch Export

CVSS v3.1

4.3 MEDIUM

EPSS

0.37%

probability of exploitation in 30 days

CISA KEV

Not listed

no confirmed exploitation reported

News coverage

sources referencing this CVE

Related IOCs

seen in the same coverage

EPSS Trend

Sep 16, 2026 → Oct 22, 2026

▲ 0.15pp

0.22% → 0.37% over 3 tracked changes

CVSS v3.1 Detail

Attack VectorNETWORK

Attack ComplexityLOW

Privileges RequiredLOW

User InteractionNONE

ScopeUNCHANGED

ConfidentialityNONE

IntegrityNONE

AvailabilityLOW

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

Connections

1 relationships

CWE-704

source

Timeline

disclosure → media coverage

Sep 14, 2026

Disclosure — published as a CVE record.