High
Security advisory
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-26038
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 07:16 UTC · Revision 1
Source evidence
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.
osv:CVE-2021-26038
Complete source record
{
"id": "c4d3e5657a50ee866ef9d3163dfcfcb65d591dc318044f64960b5e424536b849",
"url": "https://osv.dev/vulnerability/CVE-2021-26038",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-26038",
"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.",
"evidence": "osv:CVE-2021-26038",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2021-26038",
"aliases": [
"BIT-joomla-2021-26038",
"CVE-2021-26038"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/joomla/joomla-cms",
"type": "GIT",
"events": [
{
"introduced": "d53146a31d303a10b8cc4fa78a6fb16770ae50e7"
},
{
"last_affected": "4cf3b7c1559e11cb75be6662511b5d7e4da9c550"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:joomla:joomla\\!:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.5.0"
},
{
"last_affected": "3.9.27"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"3.9.27",
"3.9.27-rc",
"3.9.26",
"3.9.26-rc",
"3.9.25",
"3.9.25-rc",
"3.9.24",
"3.9.24-rc2",
"3.9.24-rc",
"3.9.20-rc",
"3.9.23",
"3.9.23-rc2",
"3.9.23-rc",
"3.9.19",
"3.9.22",
"3.9.22-rc",
"3.9.21",
"3.9.21-rc",
"3.9.20",
"3.9.19-rc",
"3.9.17-rc",
"3.9.18",
"3.9.17",
"3.9.16",
"3.9.15",
"3.9.15-rc",
"3.9.16-rc",
"3.9.14",
"3.9.14-rc",
"3.9.13",
"3.9.12",
"3.9.13-rc2",
"3.9.13-rc",
"3.9.12-rc",
"3.9.11",
"3.9.10",
"3.9.8",
"3.9.11-rc",
"3.9.9",
"3.9.6",
"3.9.5",
"3.9.9-rc",
"3.9.4",
"3.9.3",
"3.9.7",
"3.9.7-rc",
"3.9.2-rc",
"3.9.1",
"3.9.6-rc2",
"3.9.6-rc",
"3.9.0",
"3.9.0-rc",
"3.9.0-beta4",
"3.9.5-rc",
"3.9.4-rc",
"3.8.11",
"3.9.3-rc",
"3.9.2",
"3.8.8",
"3.9.1-rc",
"3.9.0-rc2",
"3.8.7",
"3.8.12",
"3.9.0-beta3",
"3.9.0-beta2",
"3.9.0-beta",
"3.8.12-rc",
"3.8.11-rc",
"3.8.6",
"3.8.10",
"3.8.9",
"3.8.4",
"3.8.9-rc",
"issues-241-257",
"3.8.8-rc",
"3.8.7-rc",
"3.8.6-rc1",
"3.8.3",
"3.8.3-rc",
"3.8.5",
"3.8.5-rc",
"3.8.4-rc2",
"3.8.4-rc",
"3.8.2",
"3.8.1",
"3.8.0",
"3.8.2-rc",
"3.8.1-rc",
"3.8.0-rc1",
"3.8.0-beta2",
"3.8.0-beta4",
"3.8.0-beta1",
"3.8.0-beta3",
"3.7.4-rc1",
"3.7.4-beta1",
"3.7.3",
"3.7.3-rc2",
"3.7.3-rc1",
"3.7.3-beta1",
"3.7.2",
"3.7.1",
"3.7.1-rc2",
"3.7.1-rc1",
"3.7.0",
"3.7.0-rc4",
"3.7.0-rc3",
"3.7.0-rc2",
"3.7.0-rc1",
"3.7.0-beta4",
"3.7.0-beta3",
"3.7.0-beta2",
"3.7.0-beta1",
"3.7.0-alpha1",
"3.6.3",
"3.6.3-rc3",
"3.6.3-rc2",
"3.6.3-rc1",
"3.6.2",
"3.6.1",
"3.6.1-rc2",
"3.6.1-rc1",
"3.6.0",
"3.6.0-rc2",
"3.6.0-rc",
"3.6.0-beta2",
"3.6.0-beta1",
"3.6.0-alpha",
"3.5.1",
"3.5.1-rc2",
"3.5.1-rc",
"3.5.0",
"3.5.0-rc4",
"3.5.0-rc2",
"3.5.0-rc",
"3.5.0-beta5",
"3.5.0-beta4",
"3.5.0-beta3",
"3.5.0-beta2",
"3.4.5",
"3.5.0-beta",
"3.4.4",
"3.4.4-rc2",
"3.4.4-rc",
"3.4.3",
"3.4.2",
"3.4.2-rc",
"3.4.1",
"3.4.1-rc2",
"3.4.1-rc",
"3.4.0",
"3.4.0-rc",
"3.4.0-beta3",
"3.4.0-beta2",
"3.4.0-beta1",
"3.2.4",
"3.3.0",
"3.2.3",
"3.2.2",
"3.2.1",
"3.2.0",
"3.1.5",
"3.2.0.rc",
"3.2.0.beta",
"3.2.0.alpha",
"3.1.1",
"3.0.3",
"3.1.0_beta5",
"3.1.0_beta4",
"3.1.0_beta3",
"3.1.0_beta2",
"3.1.0_beta1",
"3.0.1",
"3.0.0",
"3.0.0_beta1",
"3.0.0_alpha-2",
"3.0.0_alpha-1",
"2.5.6",
"2.5.5",
"2.5.4",
"2.5.1",
"2.5.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-26038.json"
}
}
],
"modified": "2026-10-24T10:30:50.962968005Z",
"provider": "osv",
"references": [
"https://developer.joomla.org/security-centre/859-20210704-core-privilege-escalation-through-com-installer.html"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2021-26038",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 437381,
"published_at": "2021-07-07T11:15:08.7+00:00"
}