FKIE_CVE-2026-33395

Vulnerability from fkie_nvd - Published: 2026-03-19 23:16 - Updated: 2026-03-24 19:46
Severity ?
4.4 (Medium) - CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N
5.4 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Summary
Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, the discourse-graphviz plugin contains a stored cross-site scripting (XSS) vulnerability that allows authenticated users to inject malicious JavaScript code through DOT graph definitions. For instances with CSP disabled only. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. As a workaround, disable the graphviz plugin, upgrade to a patched version, or enable a content security policy.
References
security-advisories@github.comhttps://github.com/discourse/discourse/commit/0471e68ed0b594bf386e068f228849244b880ef1Patch
security-advisories@github.comhttps://github.com/discourse/discourse/commit/0c861df8bea03dcc01b60da6cc7038e6c88de4eePatch
security-advisories@github.comhttps://github.com/discourse/discourse/commit/472f9e1f7855307e489e9eaa6825d5335dfc08b5Patch
security-advisories@github.comhttps://github.com/discourse/discourse/security/advisories/GHSA-23c7-gq89-xm5vMitigation, Vendor Advisory
Impacted products
Vendor Product Version
discourse discourse *
discourse discourse *
discourse discourse 2026.3.0
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
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              "matchCriteriaId": "4BE96625-3609-410C-B41E-4A824C1A57C0",
              "versionEndExcluding": "2026.1.2",
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              "vulnerable": true
            },
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, the discourse-graphviz plugin contains a stored cross-site scripting (XSS) vulnerability that allows authenticated users to inject malicious JavaScript code through DOT graph definitions. For instances with CSP disabled only. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. As a workaround, disable the graphviz plugin, upgrade to a patched version, or enable a content security policy."
    },
    {
      "lang": "es",
      "value": "Discourse es una plataforma de discusi\u00f3n de c\u00f3digo abierto. Antes de las versiones 2026.3.0-latest.1, 2026.2.1 y 2026.1.2, el plugin discourse-graphviz contiene una vulnerabilidad de cross-site scripting (XSS) almacenado que permite a los usuarios autenticados inyectar c\u00f3digo JavaScript malicioso a trav\u00e9s de definiciones de gr\u00e1ficos DOT. Solo para instancias con CSP deshabilitado. Las versiones 2026.3.0-latest.1, 2026.2.1 y 2026.1.2 contienen un parche. Como soluci\u00f3n alternativa, deshabilite el plugin graphviz, actualice a una versi\u00f3n parcheada o habilite una pol\u00edtica de seguridad de contenido."
    }
  ],
  "id": "CVE-2026-33395",
  "lastModified": "2026-03-24T19:46:59.323",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 4.4,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N",
          "version": "3.1"
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        "impactScore": 2.7,
        "source": "security-advisories@github.com",
        "type": "Secondary"
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          "attackVector": "NETWORK",
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          "baseScore": 5.4,
          "baseSeverity": "MEDIUM",
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          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
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        "source": "nvd@nist.gov",
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  "published": "2026-03-19T23:16:44.710",
  "references": [
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      "tags": [
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    },
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      "tags": [
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "value": "CWE-79"
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      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}


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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.