FKIE_CVE-2026-86062

Vulnerability from fkie_nvd - Published: 2026-09-22 17:17 - Updated: 2026-09-22 19:16
Severity
6.1 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Summary
LightRAG provides simple and fast retrieval-augmented generation. Prior to 1.5.5, lightrag_webui/src/components/retrieval/ChatMessage.tsx renders answer and thinking content with react-markdown, rehypeRaw, and skipHtml=false without an HTML sanitizer. An attacker who can add a document can store raw HTML that is returned through the query path and rendered as active content by MessageMarkdown. A user who later retrieves the content can execute attacker-controlled JavaScript through elements such as an iframe srcdoc; the additional Mermaid securityLevel: loose rendering path also injects generated SVG through innerHTML. The script runs in the LightRAG WebUI origin and can read the API token in localStorage and perform API actions as the victim. This issue is fixed in version 1.5.5.
References
security-advisories@github.comhttps://github.com/HKUDS/LightRAG/commit/8bf032a5200f293b482dd945d436e25cd08bd953
security-advisories@github.comhttps://github.com/HKUDS/LightRAG/pull/3437
security-advisories@github.comhttps://github.com/HKUDS/LightRAG/releases/tag/v1.5.5
security-advisories@github.comhttps://github.com/HKUDS/LightRAG/security/advisories/GHSA-xpjq-3w4w-w5wr
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/HKUDS/LightRAG/security/advisories/GHSA-xpjq-3w4w-w5wr
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "LightRAG",
          "vendor": "HKUDS",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.5.5"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "LightRAG provides simple and fast retrieval-augmented generation. Prior to 1.5.5, lightrag_webui/src/components/retrieval/ChatMessage.tsx renders answer and thinking content with react-markdown, rehypeRaw, and skipHtml=false without an HTML sanitizer. An attacker who can add a document can store raw HTML that is returned through the query path and rendered as active content by MessageMarkdown. A user who later retrieves the content can execute attacker-controlled JavaScript through elements such as an iframe srcdoc; the additional Mermaid securityLevel: loose rendering path also injects generated SVG through innerHTML. The script runs in the LightRAG WebUI origin and can read the API token in localStorage and perform API actions as the victim. This issue is fixed in version 1.5.5."
    }
  ],
  "id": "CVE-2026-86062",
  "lastModified": "2026-09-22T19:16:54.870",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.1,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 2.7,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-86062",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-09-22T18:14:49.454452Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-09-22T17:17:27.863",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/HKUDS/LightRAG/commit/8bf032a5200f293b482dd945d436e25cd08bd953"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/HKUDS/LightRAG/pull/3437"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/HKUDS/LightRAG/releases/tag/v1.5.5"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/HKUDS/LightRAG/security/advisories/GHSA-xpjq-3w4w-w5wr"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/HKUDS/LightRAG/security/advisories/GHSA-xpjq-3w4w-w5wr"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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