CVE-2026-49284

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Source
https://cve.org/CVERecord?id=CVE-2026-49284
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49284.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-49284
Aliases
Downstream
Published
2026-07-17T19:17:23Z
Modified
2026-08-12T03:51:19Z
Severity
  • 7.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N CVSS Calculator
Summary
SimpleSAMLphp SP accepts a response from an unexpected IdP when unsigned `Response/InResponseTo` is combined with a signed assertion lacking `SubjectConfirmationData/InResponseTo`
Details

SimpleSAMLphp versions before 1.18.6 contain an information disclosure vulnerability. Prior to 2.4.7 and 2.5.2, SimpleSAMLphp's SAML SP ACS path does not enforce the IdP selected for an SP-initiated login when unsigned Response/InResponseTo is combined with a signed assertion lacking SubjectConfirmationData/InResponseTo, allowing a response issued by one trusted IdP to be bound to SP state created for another IdP and bypass flows that route users to a specific IdP, including deployments that set enable_unsolicited to false. This issue is fixed in versions 2.4.7 and 2.5.2.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-345"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49284.json"
}
References

Affected packages

Git / github.com/simplesamlphp/simplesamlphp

Affected ranges

Type
GIT
Repo
https://github.com/simplesamlphp/simplesamlphp
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
8b871fab276d4b0b2a09a727ceaa10ca3abd5d30
Introduced
a21e4f6bd67e41c6bc5ef2b69e1cd1ed42f41e28
Fixed
e04c29a772769bb0bacba0ba072b599779d158c4
Database specific
Show details 
{
    "cpe": "cpe:2.3:a:simplesamlphp:simplesamlphp:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "2.4.7"
        },
        {
            "introduced": "2.5.0"
        },
        {
            "fixed": "2.5.2"
        }
    ],
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ]
}

Affected versions

v1.*
v1.12.0
v1.15.0-rc1
v2.*
v2.0.0
v2.0.0-beta.1
v2.0.0-beta.11
v2.0.0-beta.2
v2.0.0-beta.3
v2.0.0-beta.4
v2.0.0-rc1
v2.0.0-rc2
v2.0.0-rc3
v2.0.1
v2.0.2
v2.0.3
v2.0.4
v2.1.0-rc1
v2.3.0
v2.4.0
v2.4.1
v2.4.2
v2.4.3
v2.4.4
v2.4.5
v2.4.6
v2.5.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49284.json"