CVE-2026-18963
CriticalExploitedThe issue allows an unauthenticated attacker to force the password reset process for any user without needing to click the required email verification link.
Published Aug 18, 2026 · Updated Sep 8, 2026 · Also known as BIT-keycloak-2026-18963, GHSA-4gv3-mc9p-5wqc
Key Facts
Patch immediately- CVE-2026-18963 is a critical-severity vulnerability (CVSS 9.1 v3.1) affecting 26.4 (Build Keycloak), 26.6 (Build Keycloak), keycloak-26.5 (chainguard) and 18 more products.
- It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Aug 25, 2026. No public exploit code is known.
- EPSS estimates a 3.2% probability of exploitation in the next 30 days.
- Fixed versions are available, including keycloak 26.7.2, keycloak 26.7.2-r0, keycloak-26.5 26.5.7-r6.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS (30-day exploit likelihood)
3.2%
Higher than 87.8% of all scored CVEs
Exploited in the wild
Yes
2 catalog listings
Public exploit code
None known
Get the full CVE-2026-18963 brief as a PDF
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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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Aug 25, 2026 | n/a | Not reported |
| CIRCL KEV | Aug 25, 2026 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
28 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| 26.4Build Keycloak | See advisory | n/a |
| 26.6Build Keycloak | See advisory | n/a |
| keycloak-26.5chainguard | See advisory | 26.5.7-r6 |
| keycloak-fips-26.5chainguard | See advisory | 26.5.7-r12 |
| request-9047-keycloak-fips-26.5chainguard | See advisory | 26.5.7-r26 |
Patched Releases
keycloak
26.7.2, 26.7.2-r0
keycloak-26.5
26.5.7-r6
keycloak-fips
26.7.2-r0
keycloak-fips-26.5
26.5.7-r12
keycloak-rhel9-container
26.6-12
keycloak-rhel9-operator-bundle-container
26.6.6-1
keycloak-rhel9-operator-container
26.6-12
org.keycloak:keycloak-services
26.1.4+sp999, 26.4.15, 26.6.6, 26.7.2
request-9047-keycloak-fips-26.5
26.5.7-r26
rhbk/keycloak-operator-bundle:26.4.15
1
rhbk/keycloak-operator-bundle:26.6.6
1
rhbk/keycloak-rhel9-operator:26.4
23
rhbk/keycloak-rhel9-operator:26.6
12
rhbk/keycloak-rhel9:26.4
23
rhbk/keycloak-rhel9:26.6
12
seal.sp1.org.keycloak:keycloak-services
26.1.4+sp999
Timeline
Publicly disclosed
Aug 18, 2026
Added to Industry KEV feed
Aug 25, 2026
Added to CIRCL KEV
Aug 25, 2026
Last updated
Sep 8, 2026
Weakness Type
- CWE-640 Weak Password Recovery Mechanism for Forgotten Password
References
- advisoryGHSA advisory
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- articlehttps://github.com/keycloak/keycloak/commit/dc2d4e524b4dae85aedc87ca28b9e4fa567d56c1
- articlehttps://github.com/keycloak/keycloak/issues/51833
FAQ
Common Questions.
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.
Affected: 26.4 (Build Keycloak); 26.6 (Build Keycloak); keycloak-26.5 (chainguard), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Aug 25, 2026.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including keycloak 26.7.2, keycloak 26.7.2-r0, keycloak-26.5 26.5.7-r6.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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