Improper Input Validation in Zoom Plugin Webhook Handler

MITRE NVD CVE.ORG Print: PDF PDF

Summary

CVECVE-2026-3116
StatePUBLISHED
AssignerMattermost
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-26 17:16:42 UTC
Updated2026-03-30 13:26:50 UTC
DescriptionMattermost Plugins versions <=11.4 11.0.4 11.1.3 11.3.2 10.11.11.0 fail to validate incoming request size which allows an authenticated attacker to cause service disruption via the webhook endpoint. Mattermost Advisory ID: MMSA-2026-00589

Risk And Classification

Primary CVSS: v3.1 4.9 MEDIUM from [email protected]

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

EPSS: 0.000480000 probability, percentile 0.148810000 (date 2026-04-01)

Problem Types: CWE-400 | CWE-400 CWE-400 Uncontrolled Resource Consumption

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.9MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
3.1CNACVSS4.9MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Mattermost Mattermost affected 11.0.4 semver Not specified
CNA Mattermost Mattermost affected 11.1.3 semver Not specified
CNA Mattermost Mattermost affected 11.3.2 semver Not specified
CNA Mattermost Mattermost affected 10.11.11 semver Not specified
CNA Mattermost Mattermost unaffected 11.5.0 Not specified
CNA Mattermost Mattermost unaffected 11.4.1 Not specified
CNA Mattermost Mattermost unaffected 11.3.2 Not specified
CNA Mattermost Mattermost unaffected 11.2.4 Not specified
CNA Mattermost Mattermost unaffected 10.11.12 Not specified

References

ReferenceSourceLinkTags
mattermost.com/security-updates [email protected] mattermost.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: thecybertantrik (en)

Additional Advisory Data

Solutions

CNA: Update Mattermost Plugins to versions 11.5.0, 11.4.1, 11.3.2, 11.2.4, 10.11.12 or higher.

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