CVE-2026-86062

Description

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.

Overview

State: PUBLISHED
Assigner (CNA): GitHub_M
CVSS severity: MEDIUM
CVSS score: 6.1 / 10
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Effective score: 6.1 / 10 MEDIUM source: CNA overview
CWE(s): CWE-79
Reserved: 2026-09-04
Published: 2026-09-22 16:21 UTC
Last updated: 2026-09-22 18:17 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/86xxx/CVE-2026-86062.json

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-09-22 17:17:27 UTC
NVD last modified: 2026-09-22 19:16:54 UTC
NVD CVSS v3.1: 6.1 / 10 MEDIUM source: security-advisories@github.com
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Exploitability subscore: 2.8 / 10
Impact subscore: 2.7 / 10

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-84550
Assigner: GitHub_M
Published: Sep 22, 2026, 4:21:43 PM
Updated: Sep 22, 2026, 6:17:00 PM
EUVD base score (CVSS 3.1): 6.1 / 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EUVD-reported EPSS: 0.0000
Vendors: HKUDS
Products: LightRAG (< 1.5.5)
Aliases: GHSA-xpjq-3w4w-w5wr

ENISA description: 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.

EUVD references (4)

Affected products (1)

Vendor	Product	Versions	Platforms
HKUDS	LightRAG	`< 1.5.5` (affected)	—

Vendor references (4)

References embedded in the original CVE record by the assigning CNA.

https://github.com/HKUDS/LightRAG/security/advisories/GHSA-xpjq-3w4w-w5wr x_refsource_CONFIRM
https://github.com/HKUDS/LightRAG/pull/3437 x_refsource_MISC
https://github.com/HKUDS/LightRAG/commit/8bf032a5200f293b482dd945d436e25cd08bd953 x_refsource_MISC
https://github.com/HKUDS/LightRAG/releases/tag/v1.5.5 x_refsource_MISC

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (5)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://github.com/HKUDS/LightRAG/commit/8bf032a5200f293b482dd945d436e25cd08bd953 security-advisories@github.com
https://github.com/HKUDS/LightRAG/pull/3437 security-advisories@github.com
https://github.com/HKUDS/LightRAG/releases/tag/v1.5.5 security-advisories@github.com
https://github.com/HKUDS/LightRAG/security/advisories/GHSA-xpjq-3w4w-w5wr security-advisories@github.com
https://github.com/HKUDS/LightRAG/security/advisories/GHSA-xpjq-3w4w-w5wr 134c704f-9b21-4f2e-91b3-4a467353bcc0

Remediations (10)

Security Advisory - Action Required - Active Exploitation of CVE-2026 ...

web:blog.checkpoint.com

CVE - 2026 -93616 is a newly discovered zero-day vulnerability in Security Management, and a fix is available now as part of this advisory. Fixes are available for both vulnerabilities. Customers running affected versions should install the applicable fixes immediately. Affected versions and remediation instructions are detailed below.

2026-09-23 15:43 UTC
Microsoft Patch Tuesday for September 2026 — Snort rules and prominent ...

web:blog.talosintelligence.com

Microsoft has released its monthly security update for September 2026 , which includes 973 vulnerabilities affecting a range of products, including 113 that Microsoft marked as "critical." Microsoft notes that 2 of the vulnerabilities disclosed this month have been exploited in the wild: CVE - 2026 -81963 affects Windows Update Stack. CVE - 2026 -81963 is a elevation of privilege vulnerability ...

2026-09-23 15:43 UTC
Microsoft Patch Tracker (September 2026): Exploit-Ranked | Senserva

web:senserva.com

Every Microsoft security patch (KB) and the CVEs it fixes, with severity, CVSS, and CISA KEV status. Cross-linked to the CVE reference.

2026-09-23 15:43 UTC
N-central 2026.3 Hotfix 3 - CVE-2026-86206 and CVE-2026-86207

web:status.n-able.com

Build Number: 2026.3.1.13 Last Updated: Sept 5th 2026 Security Update This hotfix includes security fixes for CVE - 2026 -86206 and CVE - 2026 -86207 which are high-CVSS-rated vulnerabilities that could allow an unauthorized party to bypass authentication controls and gain full access to the N-central platform. The vulnerabilities were responsibly disclosed by a third party through our security ...

2026-09-23 15:43 UTC
About the security content of iOS 26.6 and iPadOS 26.6

web:support.apple.com

This document describes the security content of iOS 26.6 and iPadOS 26.6.

2026-09-23 15:43 UTC
CVE-2026-58626: Install July Updates to Fix Windows RDS RCE

web:windowsforum.com

Microsoft's July 14 security updates fix CVE - 2026 -58626, a high-severity remote code execution vulnerability in Windows Remote Desktop Services.

2026-09-23 15:43 UTC
Critical Patches Issued for Microsoft Products, September 8, 2026

web:www.cisecurity.org

<p>Multiple vulnerabilities have been discovered in Microsoft products, the most severe of which could allow for remote code execution. Successful exploitation of the most severe of these vulnerabilities could result in an attacker gaining the same privileges as the logged-on user. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or ...

2026-09-23 15:43 UTC
August 2026 Patch Tuesday: Updates and Analysis | CrowdStrike

web:www.crowdstrike.com

Microsoft has released security updates for 415 vulnerabilities, including one exploited zero-day and 62 critical, in its August 2026 Patch Tuesday rollout.

2026-09-23 15:43 UTC
Oracle Critical Patch Update Advisory - July 2026

web:www.oracle.com

This Critical Patch Update contains 1448 new security patches across the product families listed below. Please note that a My Oracle Support (MOS) note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at July 2026 Critical Patch Update: Executive Summary and Analysis.

2026-09-23 15:43 UTC
Patch Tuesday September 2026: Security Updates & CVE Analysis

web:zecurit.com

Get the complete breakdown of Microsoft's September 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

2026-09-23 15:43 UTC

AI Forensic Analysis

Only Available for Registered Users. Sign in to view.

Raw JSON

The full cvelistV5 record. Download as CVE-2026-86062.json.

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-86062",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-22T18:14:49.454452Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-22T18:17:00.212Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/HKUDS/LightRAG/security/advisories/GHSA-xpjq-3w4w-w5wr"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "LightRAG",
          "vendor": "HKUDS",
          "versions": [
            {
              "status": "affected",
              "version": "< 1.5.5"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "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"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-79",
              "description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-22T16:21:43.846Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/HKUDS/LightRAG/security/advisories/GHSA-xpjq-3w4w-w5wr",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/HKUDS/LightRAG/security/advisories/GHSA-xpjq-3w4w-w5wr"
        },
        {
          "name": "https://github.com/HKUDS/LightRAG/pull/3437",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/HKUDS/LightRAG/pull/3437"
        },
        {
          "name": "https://github.com/HKUDS/LightRAG/commit/8bf032a5200f293b482dd945d436e25cd08bd953",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/HKUDS/LightRAG/commit/8bf032a5200f293b482dd945d436e25cd08bd953"
        },
        {
          "name": "https://github.com/HKUDS/LightRAG/releases/tag/v1.5.5",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/HKUDS/LightRAG/releases/tag/v1.5.5"
        }
      ],
      "source": {
        "advisory": "GHSA-xpjq-3w4w-w5wr",
        "discovery": "UNKNOWN"
      },
      "title": "LightRAG: Stored Cross-Site Scripting (XSS) in the LightRAG WebUI chat/answer renderer via ingested content"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-86062",
    "datePublished": "2026-09-22T16:21:43.846Z",
    "dateReserved": "2026-09-04T19:34:03.099Z",
    "dateUpdated": "2026-09-22T18:17:00.212Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}