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Vulnerability Details :

CVE-2026-53837

Summary
Assigner-VulnCheck
Assigner Org ID-83251b91-4cc7-4094-a5c7-464a1b83ea10
Published At-12 Jun, 2026 | 21:57
Updated At-12 Jun, 2026 | 21:57
Rejected At-
Credits

OpenClaw < 2026.5.6 - Missing Channel Type Validation in Mattermost Event Handlers

OpenClaw before 2026.5.6 contains an improper access control vulnerability in Mattermost event handlers that fails to validate channel type metadata. Attackers can bypass intended DM policy decisions by sending crafted Mattermost events missing channel type information to process restricted content.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
â–¼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:VulnCheck
Assigner Org ID:83251b91-4cc7-4094-a5c7-464a1b83ea10
Published At:12 Jun, 2026 | 21:57
Updated At:12 Jun, 2026 | 21:57
Rejected At:
â–¼CVE Numbering Authority (CNA)
OpenClaw < 2026.5.6 - Missing Channel Type Validation in Mattermost Event Handlers

OpenClaw before 2026.5.6 contains an improper access control vulnerability in Mattermost event handlers that fails to validate channel type metadata. Attackers can bypass intended DM policy decisions by sending crafted Mattermost events missing channel type information to process restricted content.

Affected Products
Vendor
OpenClawOpenClaw
Product
OpenClaw
Repo
https://github.com/openclaw/openclaw
Default Status
unaffected
Versions
Affected
  • From 0 before 2026.5.6 (semver)
Unaffected
  • 2026.5.6 (semver)
Problem Types
TypeCWE IDDescription
CWECWE-636Not Failing Securely ('Failing Open')
Type: CWE
CWE ID: CWE-636
Description: Not Failing Securely ('Failing Open')
Metrics
VersionBase scoreBase severityVector
4.06.3MEDIUM
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
3.13.7LOW
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Version: 4.0
Base score: 6.3
Base severity: MEDIUM
Vector:
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Version: 3.1
Base score: 3.7
Base severity: LOW
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

reporter
zsx (@zsxsoft)
coordinator
KeenSecurityLab
tool
qclawer
Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/openclaw/openclaw/security/advisories/GHSA-gp79-m99v-gjmh
vendor-advisory
https://www.vulncheck.com/advisories/openclaw-missing-channel-type-validation-in-mattermost-event-handlers
third-party-advisory
Hyperlink: https://github.com/openclaw/openclaw/security/advisories/GHSA-gp79-m99v-gjmh
Resource:
vendor-advisory
Hyperlink: https://www.vulncheck.com/advisories/openclaw-missing-channel-type-validation-in-mattermost-event-handlers
Resource:
third-party-advisory
Information is not available yet
â–¼National Vulnerability Database (NVD)
nvd.nist.gov
Source:disclosure@vulncheck.com
Published At:12 Jun, 2026 | 22:16
Updated At:12 Jun, 2026 | 22:16

OpenClaw before 2026.5.6 contains an improper access control vulnerability in Mattermost event handlers that fails to validate channel type metadata. Attackers can bypass intended DM policy decisions by sending crafted Mattermost events missing channel type information to process restricted content.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.06.3MEDIUM
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary3.13.7LOW
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Type: Secondary
Version: 4.0
Base score: 6.3
Base severity: MEDIUM
Vector:
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Type: Primary
Version: 3.1
Base score: 3.7
Base severity: LOW
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
CPE Matches

Weaknesses
CWE IDTypeSource
CWE-636Primarydisclosure@vulncheck.com
CWE ID: CWE-636
Type: Primary
Source: disclosure@vulncheck.com
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://github.com/openclaw/openclaw/security/advisories/GHSA-gp79-m99v-gjmhdisclosure@vulncheck.com
N/A
https://www.vulncheck.com/advisories/openclaw-missing-channel-type-validation-in-mattermost-event-handlersdisclosure@vulncheck.com
N/A
Hyperlink: https://github.com/openclaw/openclaw/security/advisories/GHSA-gp79-m99v-gjmh
Source: disclosure@vulncheck.com
Resource: N/A
Hyperlink: https://www.vulncheck.com/advisories/openclaw-missing-channel-type-validation-in-mattermost-event-handlers
Source: disclosure@vulncheck.com
Resource: N/A

Change History

0
Information is not available yet

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||
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Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
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CWE ID-CWE-636
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Details not found