cvelist/2021/43xxx/CVE-2021-43827.json

{
    "CVE_data_meta": {
        "ASSIGNER": "security-advisories@github.com",
        "ID": "CVE-2021-43827",
        "STATE": "PUBLIC",
        "TITLE": "Inline footnotes wrapped in <a> tags can cause errors in discourse-footnotes"
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "product": {
                        "product_data": [
                            {
                                "product_name": "discourse-footnote",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_value": "< 0.2"
                                        }
                                    ]
                                }
                            }
                        ]
                    },
                    "vendor_name": "discourse"
                }
            ]
        }
    },
    "data_format": "MITRE",
    "data_type": "CVE",
    "data_version": "4.0",
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "discourse-footnote is a library providing footnotes for posts in Discourse. ### Impact When posting an inline footnote wrapped in `<a>` tags (e.g. `<a>^[footnote]</a>`, the resulting rendered HTML would include a nested `<a>`, which is stripped by Nokogiri because it is not valid. This then caused a javascript error on topic pages because we were looking for an `<a>` element inside the footnote reference span and getting its ID, and because it did not exist we got a null reference error in javascript. Users are advised to update to version 0.2. As a workaround editing offending posts from the rails console or the database console for self-hosters, or disabling the plugin in the admin panel can mitigate this issue."
            }
        ]
    },
    "impact": {
        "cvss": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
        }
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE-755: Improper Handling of Exceptional Conditions"
                    }
                ]
            }
        ]
    },
    "references": {
        "reference_data": [
            {
                "name": "https://github.com/discourse/discourse-footnote/security/advisories/GHSA-58vr-c56v-qr57",
                "refsource": "CONFIRM",
                "url": "https://github.com/discourse/discourse-footnote/security/advisories/GHSA-58vr-c56v-qr57"
            },
            {
                "name": "https://github.com/discourse/discourse-footnote/commit/796617e0131277011207541313522cd1946661ab",
                "refsource": "MISC",
                "url": "https://github.com/discourse/discourse-footnote/commit/796617e0131277011207541313522cd1946661ab"
            }
        ]
    },
    "source": {
        "advisory": "GHSA-58vr-c56v-qr57",
        "discovery": "UNKNOWN"
    }
}