Vulnerability-Lookup

CVE-2026-42568 (GCVE-0-2026-42568)

Vulnerability from cvelistv5 – Published: 2026-06-10 22:15 – Updated: 2026-06-11 16:14

Title

Yamcs Vulnerable to LDAP Injection in LdapAuthModule

Summary

Yamcs is a mission control framework. Prior to versions 5.13.0 and 5.12.7, an LDAP injection vulnerability exists in `org.yamcs.security.LdapAuthModule` when constructing search filters. The username parameter is inserted directly into the LDAP filter without proper RFC 4515 escaping. Versions 5.13.0 and 5.12.7 patch the issue.

Severity

4.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-90 - Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')

Assigner

GitHub_M

References

3 references

URL	Tags
https://github.com/yamcs/yamcs/security/advisorie…	x_refsource_CONFIRM
https://github.com/yamcs/yamcs/releases/tag/yamcs…	x_refsource_MISC
https://github.com/yamcs/yamcs/releases/tag/yamcs…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
yamcs	yamcs	Affected: < 5.12.7

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-42568

Vulnerability from fkie_nvd - Published: 2026-06-10 23:16 - Updated: 2026-06-17 10:48

Severity

4.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/yamcs/yamcs/releases/tag/yamcs-5.12.7
	security-advisories@github.com	https://github.com/yamcs/yamcs/releases/tag/yamcs-5.13.0
	security-advisories@github.com	https://github.com/yamcs/yamcs/security/advisories/GHSA-cqh3-jg8p-336j

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "yamcs",
          "vendor": "yamcs",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 5.12.7"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Yamcs is a mission control framework. Prior to versions 5.13.0 and 5.12.7, an LDAP injection vulnerability exists in `org.yamcs.security.LdapAuthModule` when constructing search filters. The username parameter is inserted directly into the LDAP filter without proper RFC 4515 escaping. Versions 5.13.0 and 5.12.7 patch the issue."
    }
  ],
  "id": "CVE-2026-42568",
  "lastModified": "2026-06-17T10:48:03.103",
  "metrics": {
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          "baseScore": 4.3,
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          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
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}

GHSA-CQH3-JG8P-336J

Vulnerability from github – Published: 2026-05-26 23:39 – Updated: 2026-06-11 14:05

Summary

Yamcs Vulnerable to LDAP Injection in LdapAuthModule

Details

Summary

An LDAP injection vulnerability exists in org.yamcs.security.LdapAuthModule when constructing search filters. The username parameter is inserted directly into the LDAP filter without proper RFC 4515 escaping.

Root Cause

File: yamcs-core/src/main/java/org/yamcs/security/LdapAuthModule.java:233

The username parameter is inserted directly into an LDAP search filter without RFC 4515 escaping:

// VULNERABLE
var filter = userFilter.replace("{0}", username);
var searchResult = getSingleResult(ctx, userBase, filter, controls);

LDAP wildcard characters (*, (, )) are accepted without sanitization.

Impact

With a known valid password, username=* authenticates as the first user returned by the LDAP search — enabling horizontal privilege escalation between accounts sharing similar passwords or when the attacker knows one valid password.

This affects deployments that use org.yamcs.security.LdapAuthModule in their etc/security.yaml configuration file.

Proof of Concept

curl -X POST "http://TARGET:8090/auth/token" \
  -d "grant_type=password&username=*&password=known_password"
# Returns token for first matching LDAP user

Fix

Apply RFC 4515 escaping before filter construction:

private static String escapeLdapFilter(String input) {
    return input
        .replace("\\", "\\5c")
        .replace("*",  "\\2a")
        .replace("(",  "\\28")
        .replace(")",  "\\29")
        .replace("\0", "\\00");
}
var filter = userFilter.replace("{0}", escapeLdapFilter(username));

Severity

4.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.yamcs:yamcs-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.12.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-42568"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-90"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-26T23:39:55Z",
    "nvd_published_at": "2026-06-10T23:16:46Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\n\nAn LDAP injection vulnerability exists in `org.yamcs.security.LdapAuthModule` when constructing search filters. The username parameter is inserted directly into the LDAP filter without proper RFC 4515 escaping.\n\n### Root Cause\n\n**File:** `yamcs-core/src/main/java/org/yamcs/security/LdapAuthModule.java:233`\n\nThe `username` parameter is inserted directly into an LDAP search filter without RFC 4515 escaping:\n\n```java\n// VULNERABLE\nvar filter = userFilter.replace(\"{0}\", username);\nvar searchResult = getSingleResult(ctx, userBase, filter, controls);\n```\n\nLDAP wildcard characters (`*`, `(`, `)`) are accepted without sanitization.\n\n### Impact\n\nWith a known valid password, `username=*` authenticates as the first user returned by the LDAP search \u2014 enabling horizontal privilege escalation between accounts sharing similar passwords or when the attacker knows one valid password.\n\nThis affects deployments that use `org.yamcs.security.LdapAuthModule` in their `etc/security.yaml` configuration file.\n\n### Proof of Concept\n\n```bash\ncurl -X POST \"http://TARGET:8090/auth/token\" \\\n  -d \"grant_type=password\u0026username=*\u0026password=known_password\"\n# Returns token for first matching LDAP user\n```\n\n### Fix\n\nApply RFC 4515 escaping before filter construction:\n\n```java\nprivate static String escapeLdapFilter(String input) {\n    return input\n        .replace(\"\\\\\", \"\\\\5c\")\n        .replace(\"*\",  \"\\\\2a\")\n        .replace(\"(\",  \"\\\\28\")\n        .replace(\")\",  \"\\\\29\")\n        .replace(\"\\0\", \"\\\\00\");\n}\nvar filter = userFilter.replace(\"{0}\", escapeLdapFilter(username));\n```",
  "id": "GHSA-cqh3-jg8p-336j",
  "modified": "2026-06-11T14:05:22Z",
  "published": "2026-05-26T23:39:55Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/yamcs/yamcs/security/advisories/GHSA-cqh3-jg8p-336j"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42568"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/yamcs/yamcs"
    },
    {
      "type": "WEB",
      "url": "https://github.com/yamcs/yamcs/releases/tag/yamcs-5.12.7"
    },
    {
      "type": "WEB",
      "url": "https://github.com/yamcs/yamcs/releases/tag/yamcs-5.13.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Yamcs Vulnerable to LDAP Injection in LdapAuthModule"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-42568 (GCVE-0-2026-42568)

FKIE_CVE-2026-42568

GHSA-CQH3-JG8P-336J

Summary

Root Cause

Impact

Proof of Concept

Fix

Tags

Sightings

Nomenclature