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LDAP injection in MISP ApacheAuthenticate when using a user-controlled Apache environment variable

Type: advisorySources: OSV

MISP is an open source threat intelligence and sharing platform. Prior to 2.5.36, improper neutralization of special elements in an LDAP query in ApacheAuthenticate.php allows LDAP injection via an unsanitized username value when ApacheAuthenticate.apacheEnv is configured to use a user-controlled server variable instead of REMOTE_USER (such as in certain proxy setups). An attacker able to control that value can manipulate the LDAP search filter and potentially bypass authentication constraints or cause unauthorized LDAP queries. This vulnerability is fixed in 2.5.36.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-39962
Confirmed fixed CVEs
Not specified
Updated in this feed
4 Nov 2026, 15:30 UTC · Revision 1

Source evidence

LDAP injection in MISP ApacheAuthenticate when using a user-controlled Apache environment variable

core-osv · Original source

Published 9 Apr 2026, 16:37 UTC

MISP is an open source threat intelligence and sharing platform. Prior to 2.5.36, improper neutralization of special elements in an LDAP query in ApacheAuthenticate.php allows LDAP injection via an unsanitized username value when ApacheAuthenticate.apacheEnv is configured to use a user-controlled server variable instead of REMOTE_USER (such as in certain proxy setups). An attacker able to control that value can manipulate the LDAP search filter and potentially bypass authentication constraints or cause unauthorized LDAP queries. This vulnerability is fixed in 2.5.36.

osv:CVE-2026-39962
Complete source record
{
  "id": "fe87047b680f5b62f45bc09797397676930e0dfaec1e5de8aaee4e8bf2a12458",
  "url": "https://osv.dev/vulnerability/CVE-2026-39962",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "LDAP injection in MISP ApacheAuthenticate when using a user-controlled Apache environment variable",
    "summary": "MISP is an open source threat intelligence and sharing platform. Prior to 2.5.36, improper neutralization of special elements in an LDAP query in ApacheAuthenticate.php allows LDAP injection via an unsanitized username value when ApacheAuthenticate.apacheEnv is configured to use a user-controlled server variable instead of REMOTE_USER (such as in certain proxy setups). An attacker able to control that value can manipulate the LDAP search filter and potentially bypass authentication constraints or cause unauthorized LDAP queries. This vulnerability is fixed in 2.5.36.",
    "evidence": "osv:CVE-2026-39962",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-39962",
      "aliases": [
        "CVE-2026-39962",
        "GHSA-mc53-48w8-9g63"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:L/SC:H/SI:H/SA:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/misp/misp",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "b75a2ff90b8f5ec40699a84796bd729406a5f975"
                },
                {
                  "fixed": "380ee4136a7d9ce2fe63fce06d517839f30aba10"
                },
                {
                  "fixed": "d7d671ea8f5822e91207dcad2003c35c30092a32"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:misp-project:misp:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.5.36"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "380ee4136a7d9ce2fe63fce06d517839f30aba10"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "d7d671ea8f5822e91207dcad2003c35c30092a32"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "b75a2ff90b8f5ec40699a84796bd729406a5f975"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v2.5.36"
                  }
                ]
              }
            }
          ],
          "versions": [
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-39962.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:36.917275652Z",
      "provider": "osv",
      "references": [
        "https://github.com/MISP/MISP/releases/tag/v2.5.36",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39962.json",
        "https://github.com/MISP/MISP/security/advisories/GHSA-mc53-48w8-9g63",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-39962",
        "https://github.com/MISP/MISP/commit/380ee4136a7d9ce2fe63fce06d517839f30aba10",
        "https://github.com/MISP/MISP/commit/d7d671ea8f5822e91207dcad2003c35c30092a32"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-90"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39962.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-39962",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 504145,
  "published_at": "2026-04-09T16:37:38.88+00:00"
}