CVE-2026-2476Network attack vector

Secret disclosure via missing manifest flags

Published Mar 16, 2026 · Updated Mar 16, 2026

Sensitive information exposure in Mattermost Microsoft Teams Plugin 2.0.3 and earlier allows attackers to read secrets from support packets. The plugin manifest omits secret flags for the client secret, at-rest encryption key, and webhook secret, so configuration export copies their original values. Access to a generated support packet is required; exposed credentials and keys can reveal or enable access to protected integration data.

CVSS severity7.6
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sensitive information exposure in Mattermost Microsoft Teams Plugin 2.0.3 and earlier allows attackers to read secrets from support packets. The plugin manifest omits secret flags for the client secret, at-rest encryption key, and webhook secret, so configuration export copies their original values. Access to a generated support packet is required; exposed credentials and keys can reveal or enable access to protected integration data.

The record

CVE
CVE-2026-2476
Published
Mar 16, 2026
Updated
Mar 16, 2026
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-200, T1552.001
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Mar 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=2.0.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Mattermost · Mattermostversion=0 <=2.0.3

Published CVSS scores

4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
7.6Mattermost, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1552.001Unsecured Credentials: Credentials In Files

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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