keycloak: SAML broker does not check existence of signature on document allowing any user impersonation
Published Aug 14, 2019
8.1
MEDIUMCVSS 3.1
EPSS 0.71%
Description
It was found that Keycloak's SAML broker, versions up to 6.0.1, did not verify missing message signatures. If an attacker modifies the SAML Response and removes the <Signature> sections, the message is still accepted, and the message can be modified. An attacker could use this flaw to impersonate other users and gain access to sensitive information.
Affected products
-
- Version up to keycloak 6.0.1StatusaffectedConstraints-
- Version
- ≤ 6.0.1
- 7.0
- 7.3.3
No data.
Red Hat Runtimes Spring Boot 2.1.12
keycloak
Fixed · RHSA-2020:2366
Red Hat Single Sign-On 7.3.3 zip
n/a
Fixed · RHSA-2019:2483
Text-Only RHOAR
n/a
Fixed · RHSA-2020:2067
Red Hat Fuse 7
keycloak
Will not fix
Red Hat Mobile Application Platform 4
keycloak
Not affected
Red Hat OpenShift Application Runtimes
keycloak
Affected
Red Hat Single Sign-On 7
rh-sso7-keycloak
Affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Runtimes Spring Boot 2.1.12 | keycloak | Fixed | RHSA-2020:2366 |
| Red Hat Single Sign-On 7.3.3 zip | n/a | Fixed | RHSA-2019:2483 |
| Text-Only RHOAR | n/a | Fixed | RHSA-2020:2067 |
| Red Hat Fuse 7 | keycloak | Will not fix | n/a |
| Red Hat Mobile Application Platform 4 | keycloak | Not affected | n/a |
| Red Hat OpenShift Application Runtimes | keycloak | Affected | n/a |
| Red Hat Single Sign-On 7 | rh-sso7-keycloak | Affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat mitigation
Administrator can prevent this issue for POST binding by requiring signed assertions.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
AV:N/AC:L/Au:S/C:P/I:P/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Table of values (12 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.71% (0.00714) | 51.95th | v5 (v2026.06.15) |
| Sep 20, 2026 | 0.71% (0.00714) | 52.22th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.07% (0.00065) | 28.82th | v3 (v2023.03.01) |
| Jun 20, 2024 | 0.07% (0.00065) | 28.44th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.07% (0.00065) | 26.41th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00885) | 27.89th | v2 (v2022.01.01) |
| Apr 1, 2022 | 0.89% (0.00885) | 24.24th | v2 (v2022.01.01) |
| Feb 4, 2022 | 9.03% (0.09029) | 86.86th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.84% (0.01840) | 47.83th | v1 |
| Jan 6, 2022 | 1.84% (0.01840) | 47.32th | v1 |
| Jan 5, 2022 | 0.42% (0.00416) | 26.65th | v5 (v2026.06.15) |
| Apr 14, 2021 | 0.42% (0.00416) | 0.00th | v1 |
References (6)
- https://access.redhat.com/security/cve/CVE-2019-10201 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1728609 Issue Tracking
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-10201 x_refsource_CONFIRMIssue TrackingMitigationVendor Advisory
- https://github.com/advisories/GHSA-4fgq-gq9g-3rw7 Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2019-10201
- https://www.cve.org/CVERecord?id=CVE-2019-10201
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2019-10201 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1728609 | Issue Tracking | |
| https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-10201 | x_refsource_CONFIRMIssue TrackingMitigationVendor Advisory | |
| https://github.com/advisories/GHSA-4fgq-gq9g-3rw7 | Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2019-10201 | ||
| https://www.cve.org/CVERecord?id=CVE-2019-10201 |
Change history (0)
No recorded changes yet.