{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-41887",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-08T19:26:06.629218Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-08T19:26:53.642Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/flarum/framework/security/advisories/GHSA-xjvc-pw2r-6878"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "framework",
          "vendor": "flarum",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.8.16"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.0.0-beta.1, \u003c 2.0.0-rc.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Flarum is open-source forum software. Prior to versions 1.8.16 and 2.0.0-rc.1, Flarum\u0027s patch for CVE-2023-27577 restricted the @import and data-uri() LESS features in the custom_less setting, but the same restriction was never applied to other settings registered as LESS config variables (for example theme_primary_color and theme_secondary_color, as well as any key registered via Extend\\Settings::registerLessConfigVar()). Those values are interpolated verbatim into the LESS source at compile time, allowing an authenticated administrator to craft a theme-color value that injects an arbitrary @import directive into the compiled forum.css. Because the underlying LESS parser honours @import (inline) \u0027\u003cpath\u003e\u0027, an attacker can read arbitrary files reachable by the PHP process (local file inclusion) or trigger outbound HTTP(S) requests (server-side request forgery). This issue has been patched in versions 1.8.16 and 2.0.0-rc.1."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "HIGH",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-22",
              "description": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-918",
              "description": "CWE-918: Server-Side Request Forgery (SSRF)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-08T15:50:38.484Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/flarum/framework/security/advisories/GHSA-xjvc-pw2r-6878",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/flarum/framework/security/advisories/GHSA-xjvc-pw2r-6878"
        },
        {
          "name": "https://github.com/flarum/framework/commit/2d90a1f19f0e46f8c7e1b07c48ba74b5e38f8410",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/flarum/framework/commit/2d90a1f19f0e46f8c7e1b07c48ba74b5e38f8410"
        },
        {
          "name": "https://github.com/flarum/framework/releases/tag/v1.8.16",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/flarum/framework/releases/tag/v1.8.16"
        },
        {
          "name": "https://github.com/flarum/framework/releases/tag/v2.0.0-rc.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/flarum/framework/releases/tag/v2.0.0-rc.1"
        }
      ],
      "source": {
        "advisory": "GHSA-xjvc-pw2r-6878",
        "discovery": "UNKNOWN"
      },
      "title": "Flarum: Path traversal in LESS parser via theme color settings (incomplete fix for CVE-2023-27577)"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-41887",
    "datePublished": "2026-05-08T15:50:38.484Z",
    "dateReserved": "2026-04-22T15:11:54.671Z",
    "dateUpdated": "2026-05-08T19:26:53.642Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}