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CVE-2026-18963

CRITICAL 9.1 PoC AVAILABLE

Published 2026-08-18 · Last modified 2026-08-20

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.

EXPLOIT AVAILABLE

Public exploit or PoC code exists. Modeled probability is still low, but the barrier to attack is reduced — watch closely.

Exploitation likelihood

2.8%chance of exploitation in 30 days · 85th percentile

○ In CISA KEV ● Public exploit / PoC

Impact if exploited

9.1CVSS 3.1 · CRITICAL

  • ConfidentialityHigh
  • IntegrityHigh
  • AvailabilityNone

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept & exploit code

Test against your own equipment

nuclei -id CVE-2026-18963 -u https://TARGETDetection template — non-destructive check that a target is affected.
curl -s https://vulnpedia.com/cve/CVE-2026-18963/poc.jsonMachine-readable PoC index for this CVE (for automation).

Listed for defensive triage, patch verification, and authorized testing on systems you own. Machine-readable: /cve/CVE-2026-18963/poc.json

Affected

Vendors Red Hat

Products Red Hat Build Of Keycloak 26.4 Red Hat Build Of Keycloak 26.4.15 Red Hat Build Of Keycloak 26.6 Red Hat Build Of Keycloak 26.6.6 Red Hat Jboss Enterprise Application Platform Expansion Pack Red Hat Single Sign On 7

Weakness (CWE)

  • CWE-640: Weak Password Recovery Mechanism for Forgotten Password

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

All CVSS metrics

  • CRITICAL 9.1 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
  • CRITICAL 9.1 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS