CVE-2026-33410

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Source
https://cve.org/CVERecord?id=CVE-2026-33410
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33410.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-33410
Aliases
Published
2026-03-19T21:57:27Z
Modified
2026-10-28T02:30:34Z
Severity
  • 5.4 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N CVSS Calculator
Summary
Discourse hardens chat DM channel creation and expansion
Details

Discourse is an open-source discussion platform. Versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 have two authorization issues in the chat direct message API. First, when creating a direct message channel or adding users to an existing one, the target_groups parameter was passed directly to the user resolution query without checking group or member visibility for the acting user. An authenticated chat user could craft an API request with a known private/hidden group name and receive a channel containing that group's members, leaking their identities. Second, can_chat? only checked group membership, not the chat_enabled user preference. A chat-disabled user could create or query DM channels between other users via the direct messages API, potentially exposing private last_message content from the serialized channel response. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-863"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33410.json"
}
References

Affected packages

Git / github.com/discourse/discourse

Affected ranges

Type
GIT
Repo
https://github.com/discourse/discourse
Events
Introduced
322d3c0ac6a8f133b3f82875e9dbbe310f638c1b
Fixed
808b2ac23d8ff421563b40203091026732471c60
Introduced
f7cec86997edc21d6074ceb7666f7e2e6e1b1fdf
Fixed
f38464e46df1b8c51f7d60826502476908d6bb2b
Introduced
896e810e1b296478bba91559a8fc89a9926f11fe
Last Affected
896e810e1b296478bba91559a8fc89a9926f11fe
Database specific
Show details 
{
    "extracted_events":  [
        {
            "cpe":  "cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "2026.1.0"
                },
                {
                    "fixed":  "2026.1.2"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "cpe":  "cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "2026.2.0"
                },
                {
                    "fixed":  "2026.2.1"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "cpe":  "cpe:2.3:a:discourse:discourse:2026.3.0:*:*:*:latest:*:*:*",
            "range":  [
                {
                    "introduced":  "2026.3.0"
                },
                {
                    "last_affected":  "2026.3.0"
                }
            ],
            "source":  "CPE_STRING"
        }
    ]
}

Affected versions

2026.*
2026.3.0
= 2026.*
= 2026.3.0-latest
Other
esr
stable
v2026.*
v2026.1.0
v2026.1.0-latest
v2026.1.1
v2026.2.0
v2026.2.0-latest
v2026.3.0-latest

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33410.json"