CVE-2026-27570

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Source
https://cve.org/CVERecord?id=CVE-2026-27570
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-27570.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-27570
Aliases
Published
2026-03-19T20:52:17Z
Modified
2026-10-28T02:30:23Z
Severity
  • 5.1 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N CVSS Calculator
Summary
Discourse Vulnerable to Stored XSS via Shared AI Conversation Onebox
Details

Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, the onebox method in the SharedAiConversation model renders the conversation title directly into HTML without proper sanitization. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. As a workaround, tighten access by changing the ai_bot_public_sharing_allowed_groups site setting.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-79"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27570.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
Fixed
43a5a60b595f0120e6adfc131f2408508fe341f1
Fixed
c14f8f52b7999328bd9f8665f2ecfa24dadc4bf1
Fixed
f2aafa5c7467c94fcd4ebd36785a98e77ca088cc
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"
        },
        {
            "range": [
                {
                    "fixed": "43a5a60b595f0120e6adfc131f2408508fe341f1"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "range": [
                {
                    "fixed": "c14f8f52b7999328bd9f8665f2ecfa24dadc4bf1"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "range": [
                {
                    "fixed": "f2aafa5c7467c94fcd4ebd36785a98e77ca088cc"
                }
            ],
            "source": "REFERENCES_COMMIT"
        }
    ]
}

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-2026-27570.json"