CVE-2026-2578

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Source
https://cve.org/CVERecord?id=CVE-2026-2578
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-2578.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-2578
Aliases
Downstream
Related
Published
2026-03-16T11:58:09Z
Modified
2026-08-12T03:30:53Z
Severity
  • 4.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N CVSS Calculator
Summary
Information Disclosure via WebSocket Event When Deleting Unrevealed Burn on Read Posts
Details

Mattermost versions 11.3.x <= 11.3.0 fail to preserve the redacted state of burn-on-read posts during deletion which allows channel members to access unrevealed burn-on-read message contents via the WebSocket post deletion event.. Mattermost Advisory ID: MMSA-2026-00579

Database specific 
{
    "cna_assigner":  "Mattermost",
    "cwe_ids":  [
        "CWE-201"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/2xxx/CVE-2026-2578.json",
    "unresolved_ranges":  [
        {
            "extracted_events":  [
                {
                    "introduced":  "11.3.0"
                },
                {
                    "last_affected":  "11.3.0"
                }
            ],
            "source":  "AFFECTED_FIELD"
        }
    ]
}
References

Affected packages

Git / github.com/mattermost/mattermost

Affected ranges

Type
GIT
Repo
https://github.com/mattermost/mattermost
Events
Introduced
d27a2195068ddfa3ce17cf470f9739e4edb94b83
Fixed
4082c3dcf285e4d1a386d2ef37f14f39dc5a0094
Database specific
Show details 
{
    "cpe":  "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
    "extracted_events":  [
        {
            "introduced":  "11.3.0"
        },
        {
            "fixed":  "11.3.1"
        }
    ],
    "source":  "CPE_RANGE"
}

Affected versions

@mattermost/client@11.*
@mattermost/client@11.3.0
@mattermost/types@11.*
@mattermost/types@11.3.0
mattermost-redux@11.*
mattermost-redux@11.3.0
v11.*
v11.3.0
v11.3.0-rc3
v11.3.0-rc4
v11.3.1-rc1

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-2578.json"