Staging Environment: Content and features may be unstable or change without notice.
Advisory details: github_osv / GHSA-chqm-wxm2-w73w
Advisory ID github_osv/GHSA-chqm-wxm2-w73w
Aliases
Summary Duplicate Advisory: OpenClaw: Mattermost handlers could fall open when channel type was missing ### Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-gp79-m99v-gjmh. This link is maintained to preserve external references. ### Original Description 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.
Status Published
Exploitability 0.5
Weighted Severity 5.7
Risk 2.9
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (1)
CWE-636 Not Failing Securely ('Failing Open')
System Score Found at
cvssv3.1 3.7 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-chqm-wxm2-w73w/GHSA-chqm-wxm2-w73w.json
cvssv4 6.3 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-chqm-wxm2-w73w/GHSA-chqm-wxm2-w73w.json
generic_textual MODERATE
Reference id Reference type URL
https://github.com/openclaw/openclaw
https://github.com/openclaw/openclaw/security/advisories/GHSA-gp79-m99v-gjmh
https://www.vulncheck.com/advisories/openclaw-missing-channel-type-validation-in-mattermost-event-handlers
CVE-2026-53837 https://nvd.nist.gov/vuln/detail/CVE-2026-53837
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-chqm-wxm2-w73w/GHSA-chqm-wxm2-w73w.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
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 Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-chqm-wxm2-w73w/GHSA-chqm-wxm2-w73w.json
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

There are no SSVC decisions available.