CVE-2026-49436 (GCVE-0-2026-49436)

Vulnerability from cvelistv5 – Published: 2026-08-20 21:40 – Updated: 2026-08-20 21:40
VLAI
Title
LinkAce vulnerable to stored XSS via 'javascript:' URI in Bulk Link API
Summary
LinkAce is a self-hosted archive to collect website links. Prior to version 2.5.7, the Bulk Link API endpoint (`POST /api/v2/bulk/links`) accepts URLs without any format validation, allowing an authenticated user to store a `javascript:` URI. The stored URI is later rendered verbatim as an `href` in Blade templates, and clicking it executes arbitrary JavaScript in the victim's browser — exfiltrating cookies and session tokens. Version 2.5.7 fixes the issue.
Severity
7.3 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
CWE
  • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
Impacted products
Vendor Product Version CPE status
Kovah LinkAce Affected: < 2.5.7
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "LinkAce",
          "vendor": "Kovah",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.5.7"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "LinkAce is a self-hosted archive to collect website links. Prior to version 2.5.7, the Bulk Link API endpoint (`POST /api/v2/bulk/links`) accepts URLs without any format validation, allowing an authenticated user to store a `javascript:` URI. The stored URI is later rendered verbatim as an `href` in Blade templates, and clicking it executes arbitrary JavaScript in the victim\u0027s browser \u2014 exfiltrating cookies and session tokens. Version 2.5.7 fixes the issue."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.3,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/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 (\u0027Cross-site Scripting\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-20T21:40:54.087Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/Kovah/LinkAce/security/advisories/GHSA-6r73-pchm-4m39",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/Kovah/LinkAce/security/advisories/GHSA-6r73-pchm-4m39"
        },
        {
          "name": "https://github.com/Kovah/LinkAce/commit/642ac520347205a8277668bcae269bdc21223eae",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Kovah/LinkAce/commit/642ac520347205a8277668bcae269bdc21223eae"
        }
      ],
      "source": {
        "advisory": "GHSA-6r73-pchm-4m39",
        "discovery": "UNKNOWN"
      },
      "title": "LinkAce vulnerable to stored XSS via \u0027javascript:\u0027 URI in Bulk Link API"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-49436",
    "datePublished": "2026-08-20T21:40:54.087Z",
    "dateReserved": "2026-05-30T02:43:33.105Z",
    "dateUpdated": "2026-08-20T21:40:54.087Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-49436",
      "date": "2026-06-14",
      "epss": "0.00031",
      "percentile": "0.09554"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-49436\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-08-20T22:17:20.240\",\"lastModified\":\"2026-08-20T22:17:20.240\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"LinkAce is a self-hosted archive to collect website links. Prior to version 2.5.7, the Bulk Link API endpoint (`POST /api/v2/bulk/links`) accepts URLs without any format validation, allowing an authenticated user to store a `javascript:` URI. The stored URI is later rendered verbatim as an `href` in Blade templates, and clicking it executes arbitrary JavaScript in the victim\u0027s browser \u2014 exfiltrating cookies and session tokens. Version 2.5.7 fixes the issue.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"Kovah\",\"product\":\"LinkAce\",\"versions\":[{\"version\":\"\u003c 2.5.7\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N\",\"baseScore\":7.3,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"REQUIRED\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.1,\"impactScore\":5.2}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-79\"}]}],\"references\":[{\"url\":\"https://github.com/Kovah/LinkAce/commit/642ac520347205a8277668bcae269bdc21223eae\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/Kovah/LinkAce/security/advisories/GHSA-6r73-pchm-4m39\",\"source\":\"security-advisories@github.com\"}]}}"
  }
}



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