Vulnerability-Lookup

FKIE_CVE-2021-26038

Vulnerability from fkie_nvd - Published: 2021-07-07 11:15 - Updated: 2026-06-17 03:42

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Summary

An issue was discovered in Joomla! 2.5.0 through 3.9.27. Install action in com_installer lack the required hardcoded ACL checks for superusers. A default system is not affected cause the default ACL for com_installer is limited to super users already.

References

	URL	Tags
	security@joomla.org	https://developer.joomla.org/security-centre/859-20210704-core-privilege-escalation-through-com-installer.html	Vendor Advisory
	af854a3a-2127-422b-91ae-364da2661108	https://developer.joomla.org/security-centre/859-20210704-core-privilege-escalation-through-com-installer.html	Vendor Advisory

Impacted products

	Vendor	Product	Version
	joomla	joomla\!	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "Joomla! CMS",
          "vendor": "Joomla! Project",
          "versions": [
            {
              "status": "affected",
              "version": "2.5.0-3.9.27"
            }
          ]
        }
      ],
      "source": "security@joomla.org"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:joomla:joomla\\!:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "31BEB895-09CF-45A6-B565-C573D3928728",
              "versionEndIncluding": "3.9.27",
              "versionStartIncluding": "2.5.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "An issue was discovered in Joomla! 2.5.0 through 3.9.27. Install action in com_installer lack the required hardcoded ACL checks for superusers. A default system is not affected cause the default ACL for com_installer is limited to super users already."
    },
    {
      "lang": "es",
      "value": "Se ha detectado un problema en Joomla! versiones 2.5.0 hasta 3.9.27. La acci\u00f3n de instalaci\u00f3n en com_installer carece de las comprobaciones ACL embebidas requeridas para los superusuarios. Un sistema por defecto no est\u00e1 afectado porque la ACL por defecto para com_installer ya est\u00e1 limitada a los superusuarios"
    }
  ],
  "id": "CVE-2021-26038",
  "lastModified": "2026-06-17T03:42:46.853",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "MEDIUM",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 4.3,
          "confidentialityImpact": "NONE",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
          "version": "2.0"
        },
        "exploitabilityScore": 8.6,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2021-07-07T11:15:08.700",
  "references": [
    {
      "source": "security@joomla.org",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://developer.joomla.org/security-centre/859-20210704-core-privilege-escalation-through-com-installer.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://developer.joomla.org/security-centre/859-20210704-core-privilege-escalation-through-com-installer.html"
    }
  ],
  "sourceIdentifier": "security@joomla.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-754"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2021-26038 (GCVE-0-2021-26038)

Vulnerability from cvelistv5 – Published: 2021-07-07 10:12 – Updated: 2026-02-25 05:04

Title

[20210704] - Core - Privilege escalation through com_installer

Summary

Severity

No CVSS data available.

CWE

CSRF

Assigner

Joomla mitre root

References

1 reference

URL	Tags
https://developer.joomla.org/security-centre/859-…	x_refsource_MISCvendor-advisory

Impacted products

1 product

Vendor	Product	Version
Joomla! Project	Joomla! CMS	Affected: 2.5.0-3.9.27

Date Public

2021-07-06 00:00

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T20:19:19.734Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://developer.joomla.org/security-centre/859-20210704-core-privilege-escalation-through-com-installer.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Joomla! CMS",
          "vendor": "Joomla! Project",
          "versions": [
            {
              "status": "affected",
              "version": "2.5.0-3.9.27"
            }
          ]
        }
      ],
      "datePublic": "2021-07-06T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "An issue was discovered in Joomla! 2.5.0 through 3.9.27. Install action in com_installer lack the required hardcoded ACL checks for superusers. A default system is not affected cause the default ACL for com_installer is limited to super users already."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CSRF",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-25T05:04:44.258Z",
        "orgId": "6ff30186-7fb7-4ad9-be33-533e7b05e586",
        "shortName": "Joomla"
      },
      "references": [
        {
          "tags": [
            "x_refsource_MISC",
            "vendor-advisory"
          ],
          "url": "https://developer.joomla.org/security-centre/859-20210704-core-privilege-escalation-through-com-installer.html"
        }
      ],
      "title": "[20210704] - Core - Privilege escalation through com_installer",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      },
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "security@joomla.org",
          "DATE_PUBLIC": "2021-07-06T16:00:00",
          "ID": "CVE-2021-26038",
          "STATE": "PUBLIC",
          "TITLE": "[20210704] - Core - Privilege escalation through com_installer"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "Joomla! CMS",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "2.5.0-3.9.27"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "Joomla! Project"
              }
            ]
          }
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
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              "lang": "eng",
              "value": "An issue was discovered in Joomla! 2.5.0 through 3.9.27. Install action in com_installer lack the required hardcoded ACL checks for superusers. A default system is not affected cause the default ACL for com_installer is limited to super users already."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "CSRF"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://developer.joomla.org/security-centre/859-20210704-core-privilege-escalation-through-com-installer.html",
              "refsource": "MISC",
              "url": "https://developer.joomla.org/security-centre/859-20210704-core-privilege-escalation-through-com-installer.html"
            }
          ]
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "6ff30186-7fb7-4ad9-be33-533e7b05e586",
    "assignerShortName": "Joomla",
    "cveId": "CVE-2021-26038",
    "datePublished": "2021-07-07T10:12:47.940Z",
    "dateReserved": "2021-01-25T00:00:00.000Z",
    "dateUpdated": "2026-02-25T05:04:44.258Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.