CVE-2026-49256

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Source
https://cve.org/CVERecord?id=CVE-2026-49256
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49256.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-49256
Aliases
Published
2026-07-09T21:56:40Z
Modified
2026-10-21T02:30:51Z
Severity
  • 6.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N CVSS Calculator
Summary
Discourse: Hidden tag names leaked via category serializers
Details

Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, restricted tag and tag-group names attached to publicly readable categories as allowed_tags, allowed_tag_groups, or required tag groups could leak to anonymous and unauthorized users through category and group endpoints. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-200"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49256.json"
}
References

Affected packages

Git / github.com/discourse/discourse

Affected ranges

Type
GIT
Repo
https://github.com/discourse/discourse
Events
Introduced
322d3c0ac6a8f133b3f82875e9dbbe310f638c1b
Fixed
c06899647d758493d95a5b301e573ffa3db1e878
Introduced
fdd750d960e603415db62242eca3c30d68e366db
Fixed
4bbdddfc6700ca23604242111d4fa0e00347af97
Introduced
640840d818f4ee9375829ece0ef452923bb0c012
Fixed
598586ccf2e046a25d4b54132e4e1feb47f24e98
Introduced
06d03da34c4ed09ea59f917f045ba250d2b6320d
Fixed
06d03da34c4ed09ea59f917f045ba250d2b6320d
Database specific
Show details 
{
    "extracted_events":  [
        {
            "cpe":  "cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "2026.1.0"
                },
                {
                    "fixed":  "2026.1.5"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "cpe":  "cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "2026.4.0"
                },
                {
                    "fixed":  "2026.4.2"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "cpe":  "cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "2026.5.0"
                },
                {
                    "fixed":  "2026.5.1"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "cpe":  "cpe:2.3:a:discourse:discourse:2026.6.0:*:*:*:latest:*:*:*",
            "range":  [
                {
                    "introduced":  "2026.6.0"
                },
                {
                    "last_affected":  "2026.6.0"
                }
            ],
            "source":  "CPE_STRING"
        },
        {
            "original_tag":  "v2026.1.5",
            "range":  [
                {
                    "fixed":  "c06899647d758493d95a5b301e573ffa3db1e878"
                }
            ],
            "source":  "REFERENCES_TAG"
        },
        {
            "original_tag":  "v2026.4.2",
            "range":  [
                {
                    "fixed":  "4bbdddfc6700ca23604242111d4fa0e00347af97"
                }
            ],
            "source":  "REFERENCES_TAG"
        },
        {
            "original_tag":  "v2026.5.1",
            "range":  [
                {
                    "fixed":  "598586ccf2e046a25d4b54132e4e1feb47f24e98"
                }
            ],
            "source":  "REFERENCES_TAG"
        },
        {
            "original_tag":  "v2026.6.0",
            "range":  [
                {
                    "fixed":  "06d03da34c4ed09ea59f917f045ba250d2b6320d"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

Affected versions

2026.*
2026.6.0
Other
esr
stable
v2026.*
v2026.1.0
v2026.1.0-latest
v2026.1.1
v2026.1.2
v2026.1.3
v2026.1.4
v2026.4.0
v2026.4.0-latest
v2026.4.1
v2026.5.0
v2026.5.0-latest
v2026.5.0-latest.1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49256.json"