GHSA-4gv3-mc9p-5wqc BIT-keycloak-2026-18963 CVE-2026-18963
Keycloak: Unauthenticated account takeover via reset-credentials flow bypass
- Severity
- 9.1 / 10
- Critical · CVSS 3.1
- Exploit chance (EPSS)
- 4.68%
- Chance of exploitation in the next 30 days. Higher than 91.78% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-640 Weak Password Recovery Mechanism for Forgotten Password
- Fix
26.4.15- Upgrade org.keycloak:keycloak-services to this version or later
Description
A flaw was found in the reset-credentials flow of the keycloak-services component, which is the core engine for identity and access management in Red Hat Build of Keycloak. The issue allows an unauthenticated attacker to force the password reset process for any user without needing to click the required email verification link. This can result in the attacker gaining full control over target user accounts by directly setting new credentials.
Affected versions
Maven
| Package | Vulnerable | Fixed in |
|---|---|---|
| org.keycloak:keycloak-services | >= 26.0.0, < 26.4.15 |
26.4.15 |
| org.keycloak:keycloak-services | >= 26.5.0, < 26.6.6 |
26.6.6 |
| org.keycloak:keycloak-services | >= 26.7.0, < 26.7.2 |
26.7.2 |
How to fix
Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.
org.keycloak:keycloak-services Maven → 26.4.15
- maven
<dependency><groupId>org.keycloak</groupId><artifactId>keycloak-services</artifactId><version>26.4.15</version></dependency>- gradle
implementation("org.keycloak:keycloak-services:26.4.15")
Severity breakdown
CVSS 3.1 9.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- None
Weakness
CWE-640: Weak Password Recovery Mechanism for Forgotten Password
The product contains a mechanism for users to recover or change their passwords without knowing the original password, but the mechanism is weak.
How to prevent it
- Architecture and Design: Make sure that all input supplied by the user to the password recovery mechanism is thoroughly filtered and validated.
- Architecture and Design: Do not use standard weak security questions and use several security questions.
- Architecture and Design: Make sure that there is throttling on the number of incorrect answers to a security question. Disable the password recovery functionality after a certain (small) number of incorrect guesses.
- Architecture and Design: Require that the user properly answers the security question prior to resetting their password and sending the new password to the e-mail address of record.
- Architecture and Design: Never allow the user to control what e-mail address the new password will be sent to in the password recovery mechanism.
- Architecture and Design: Assign a new temporary password rather than revealing the original password.
References
Advisories
Packages
Other links
- github.com/keycloak/keycloak/issues/51833
- github.com/keycloak/keycloak/pull/51844
- github.com/keycloak/keycloak/commit/dc2d4e524b4dae85aedc87ca28b9e4fa567d56c1
- access.redhat.com/errata/RHSA-2026:56519
- access.redhat.com/errata/RHSA-2026:56520
- access.redhat.com/errata/RHSA-2026:56523
- access.redhat.com/errata/RHSA-2026:56524
- access.redhat.com/security/cve/CVE-2026-18963
- bugzilla.redhat.com/show_bug.cgi
- cert-portal.siemens.com/productcert/html/ssa-503852.html
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-v3f7-2p4r-mwfw Keycloak vulnerable to cross-site scripting (xss) via case-insensitive uri validation bypass | High | Also affects org.keycloak:keycloak-services |
| GHSA-9jrw-8xf7-xqhq Keycloak vulnerable to information disclosure through arbitrary filesystem path probing | Medium | Also affects org.keycloak:keycloak-services |
| GHSA-w3p3-7cjg-vgfw Keycloak allows unauthorized access to resources via uma permission ticket bypass | Medium | Also affects org.keycloak:keycloak-services |
| GHSA-f5p5-6xmx-p252 Keycloak vulnerable to authorization bypass via incorrect uri comparison | High | Also affects org.keycloak:keycloak-services |
| GHSA-r7rc-c989-86g6 Keycloak: Attacker can re-enable and take over disabled clients via registration access token | Medium | Also affects org.keycloak:keycloak-services |
| GHSA-6g26-7cx5-mrrg Keycloak: Information disclosure due to user profile permission bypass | Low | Also affects org.keycloak:keycloak-services |
| GHSA-cpf7-j4cf-vqx4 Keycloak has an Out-of-bounds Read | Medium | Also affects org.keycloak:keycloak-services |
| GHSA-v5g5-wwmp-jppw Keycloak has Insufficient Session Expiration | Medium | Also affects org.keycloak:keycloak-services |
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