CVE-2026-64670 (GCVE-0-2026-64670)

Vulnerability from cvelistv5 – Published: 2026-11-11 03:42 – Updated: 2026-11-11 03:42
VLAI
Title
Stored XSS in @waline/client via the unsanitized markdown preview of a comment's raw body on edit
Summary
Waline is a comment system with backend support. In versions 3.15.2 and prior, @waline/client renders the comment editor's live preview with marked and no sanitizer (utils/markdown.ts), and the preview is injected with v-html. When a comment is edited, the editor is seeded with the comment's raw, un-sanitized body (orig). Only administrators and the comment owner can edit. So an administrator who clicks Edit on an attacker's comment renders that attacker's raw HTML in their own session: an unauthenticated commenter achieves privilege-escalation stored XSS against a moderator with a single Edit click. At time of publication, there are no publicly available patches.
Severity
9.3 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
CWE
  • CWE-79 - Improper Neutralization of Input During Web Page Generation
  • CWE-116 - Improper Encoding or Escaping of Output
Assigner
GitHub_M CNA
References
Impacted products
Vendor Product Version
walinejs waline Affected: <= 3.15.2
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "waline",
          "vendor": "walinejs",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c= 3.15.2"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Waline is a comment system with backend support. In versions 3.15.2 and prior, @waline/client renders the comment editor\u0027s live preview with marked and no sanitizer (utils/markdown.ts), and the preview is injected with v-html. When a comment is edited, the editor is seeded with the comment\u0027s raw, un-sanitized body (orig). Only administrators and the comment owner can edit. So an administrator who clicks Edit on an attacker\u0027s comment renders that attacker\u0027s raw HTML in their own session: an unauthenticated commenter achieves privilege-escalation stored XSS against a moderator with a single Edit click. At time of publication, there are no publicly available patches."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 9.3,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-79",
              "description": "CWE-79: Improper Neutralization of Input During Web Page Generation",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-116",
              "description": "CWE-116: Improper Encoding or Escaping of Output",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-11T03:42:22.276Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/walinejs/waline/security/advisories/GHSA-crj3-q72p-ggqm",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/walinejs/waline/security/advisories/GHSA-crj3-q72p-ggqm"
        }
      ],
      "source": {
        "advisory": "GHSA-crj3-q72p-ggqm",
        "discovery": "UNKNOWN"
      },
      "title": "Stored XSS in @waline/client via the unsanitized markdown preview of a comment\u0027s raw body on edit"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-64670",
    "datePublished": "2026-11-11T03:42:22.276Z",
    "dateReserved": "2026-07-20T17:12:12.891Z",
    "dateUpdated": "2026-11-11T03:42:22.276Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}



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