CVE-2024-21848

Users maintain access to active call after being removed from a channel

LOW

3.1

CVSS Score

Published: April 5, 2024 at 08:13 AM UTC

Updated: June 17, 2026 at 07:10 AM UTC

2 products affected across 1 vendorMattermost ServerMattermost

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Severity

LOW3.1

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

Description

Improper Access Control in Mattermost Server versions 8.1.x before 8.1.11 allows an attacker that is in a channel with an active call to keep participating in the call even if they are removed from the channel

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Mattermost Server · Mattermost

95%

8.1.0 ≤ v < 8.1.11

Affected range stops below 8.1.11, so it looks safe — our inference, not a vendor statement

Mattermost · Mattermost

60%

8.1.0 ≤ v ≤ 8.1.108.1.0

Vendor states this is fixed in 8.1.11 (unaffected)

Vendor states this is fixed in 9.5.0 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://mattermost.com/security-updates

References (1)

Vendor Advisory

Source: [email protected]

https://mattermost.com/security-updates

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

3.1LOWMattermost

Attack Vector: NETWORK
Complexity: HIGH
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: LOW
Integrity: NONE
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-284CWE-273

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