CVE-2026-107124 (GCVE-0-2026-107124)
Vulnerability from cvelistv5
Published
2026-11-06 05:57
Modified
2026-11-06 17:34
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-384 - Session Fixation
Summary
A flaw was found in the OIDC logout endpoint of the keycloak-services component, which handles user session termination in Red Hat Build of Keycloak. The issue occurs because the system sets a session cookie based on an unvalidated token hint before completing security checks. An attacker can use this flaw to fix a session ID in a victim's browser, allowing them to hijack the victim's subsequent login and gain full control over their account.
References
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Impacted products
| Vendor | Product | Version | |||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Red Hat | Red Hat build of Keycloak 26.6 |
Unaffected: 26.6.8-2 < * cpe:/a:redhat:build_keycloak:26.6::el9 |
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{
"containers": {
"cna": {
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{
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"cpes": [
"cpe:/a:redhat:build_keycloak:26.6::el9"
],
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"status": "unaffected",
"version": "26.6.8-2",
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}
]
},
{
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"cpes": [
"cpe:/a:redhat:build_keycloak:26.6::el9"
],
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"status": "unaffected",
"version": "26.6-24",
"versionType": "rpm"
}
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{
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],
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{
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"cpes": [
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"credits": [
{
"lang": "en",
"value": "Red Hat would like to thank Adam Korczynski (Ada Logics Ltd) and Anthropic for reporting this issue."
}
],
"datePublic": "2026-11-05T00:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "A flaw was found in the OIDC logout endpoint of the keycloak-services component, which handles user session termination in Red Hat Build of Keycloak. The issue occurs because the system sets a session cookie based on an unvalidated token hint before completing security checks. An attacker can use this flaw to fix a session ID in a victim\u0027s browser, allowing them to hijack the victim\u0027s subsequent login and gain full control over their account."
}
],
"metrics": [
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"other": {
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"type": "Red Hat severity rating"
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},
{
"cvssV3_1": {
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"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.4,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N",
"version": "3.1"
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"format": "CVSS"
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"providerMetadata": {
"dateUpdated": "2026-11-06T17:34:42.126Z",
"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
"shortName": "redhat"
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"references": [
{
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"tags": [
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],
"url": "https://access.redhat.com/errata/RHSA-2026:95761"
},
{
"name": "RHSA-2026:95762",
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"url": "https://access.redhat.com/errata/RHSA-2026:95762"
},
{
"tags": [
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"url": "https://access.redhat.com/security/cve/CVE-2026-107124"
},
{
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"tags": [
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"x_refsource_REDHAT"
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2547298"
}
],
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"time": "2026-10-06T14:42:31.000Z",
"value": "Reported to Red Hat."
},
{
"lang": "en",
"time": "2026-11-05T00:00:00.000Z",
"value": "Made public."
}
],
"title": "Keycloak-services: keycloak-services: oidc logout endpoint session fixation via id_token_hint leading to account takeover",
"workarounds": [
{
"lang": "en",
"value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."
}
],
"x_generator": {
"engine": "cvelib 1.8.0"
},
"x_redhatCweChain": "CWE-384: Session Fixation"
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},
"cveMetadata": {
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"assignerShortName": "redhat",
"cveId": "CVE-2026-107124",
"datePublished": "2026-11-06T05:57:23.296Z",
"dateReserved": "2026-10-07T07:40:44.616Z",
"dateUpdated": "2026-11-06T17:34:42.126Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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