Mattermost up to 10.11.21/11.7.6/11.8.x Playbook Run state issue

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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4.2$0-$5k0.41+

Summaryinfo

A vulnerability was found in Mattermost up to 10.11.21/11.7.6/11.8.x. It has been rated as problematic. Affected by this issue is some unknown functionality of the component Playbook Run. Performing a manipulation results in state issue. This vulnerability was named CVE-2026-16046. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability classified as problematic has been found in Mattermost up to 10.11.21/11.7.6/11.8.x. This affects an unknown function of the component Playbook Run. The manipulation with an unknown input leads to a state issue vulnerability. CWE is classifying the issue as CWE-371. This is going to have an impact on integrity. The summary by CVE is:

Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21 fail to enforce run-state validation on write operations for finished playbook runs which allows a run participant to modify status, checklists, retrospective content, ownership, and participants on completed runs via REST and GraphQL API requests. Mattermost Advisory ID: MMSA-2026-00675

The advisory is shared at mattermost.com. This vulnerability is uniquely identified as CVE-2026-16046 since 07/17/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Neither technical details nor an exploit are publicly available.

Upgrading to version 10.11.22, 11.7.7 or 11.9.0 eliminates this vulnerability.

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Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.2

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 4.3
CNA Vector (Mattermost): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: State issue
CWE: CWE-371
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Mattermost 10.11.22/11.7.7/11.9.0

Timelineinfo

07/17/2026 CVE reserved
08/17/2026 +31 days Advisory disclosed
08/17/2026 +0 days VulDB entry created
08/17/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: mattermost.com
Status: Confirmed

CVE: CVE-2026-16046 (🔒)
GCVE (CVE): GCVE-0-2026-16046
GCVE (VulDB): GCVE-100-391293

Entryinfo

Created: 08/17/2026 17:33
Changes: 08/17/2026 17:33 (64)
Complete: 🔍
Cache ID: 216::103

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