CVE-2026-100404

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Source
https://cve.org/CVERecord?id=CVE-2026-100404
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-100404.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-100404
Aliases
  • GHSA-5r8f-gq2h-fcgp
Published
2026-10-14T15:50:00Z
Modified
2026-10-15T02:47:19Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
Summary
Zulip: Guests can read new messages in non-subscribed public channels
Details

Zulip is an open-source team collaboration tool. In Zulip Server versions through 12.1, guest users can receive new message events for public channels outside their subscriptions. A guest can trigger the issue by registering an event queue with parameters that request messages from an unsubscribed public channel, or an existing event queue can remain affected after the guest's access to the channel is removed. The flaw discloses new public-channel messages to the guest. This issue is fixed in version 12.2.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-862"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100404.json"
}
References

Affected packages

Git / github.com/zulip/zulip

Affected ranges

Type
GIT
Repo
https://github.com/zulip/zulip
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
1e73e1d754761b73c18135a3f25d0673f31cd8b3
Database specific
Show details 
{
    "extracted_events":  [
        {
            "introduced":  "0"
        },
        {
            "fixed":  "12.2"
        }
    ],
    "source":  "AFFECTED_FIELD"
}

Affected versions

1.*
1.3.0
1.3.1
1.3.10
1.3.11
1.3.13
1.3.2
1.3.3
1.3.4
1.3.5
1.3.6
1.3.7
1.3.8
1.3.9
1.4.0
1.5.0
1.6.0
1.7.0
1.8.0
1.8.0-rc1
1.9.0
1.9.0-rc2
1.9.0-rc3
10.*
10.0
10.0-beta1
10.0-beta2
11.*
11.0
11.0-beta1
11.0-beta2
11.0-dev
12.*
12.0
12.0-beta1
12.0-beta2
12.0-dev
12.1
2.*
2.0.0
2.0.0-rc1
2.1-dev
2.1.0
2.1.0-rc1
2.2-dev
3.*
3.0
3.0-dev
3.0-rc1
3.0-rc2
4.*
4.0
4.0-dev
5.*
5.0
5.0-dev
6.*
6.0
6.0-dev
7.*
7.0
7.0-beta3
7.0-dev
8.*
8.0
8.0-beta1
8.0-beta2
8.0-dev
9.*
9.0
9.0-beta1
9.0-dev
enterprise-1.*
enterprise-1.1.5
enterprise-1.2.0
shared-0.*
shared-0.0.1
shared-0.0.10
shared-0.0.11
shared-0.0.12
shared-0.0.13
shared-0.0.14
shared-0.0.15
shared-0.0.16
shared-0.0.17
shared-0.0.18
shared-0.0.2
shared-0.0.3
shared-0.0.4
shared-0.0.5
shared-0.0.6
shared-0.0.7
shared-0.0.8
shared-0.0.9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-100404.json"