CVE-2026-18217

MEDIUMNVD 4.74.7—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.7 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 91% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
4.7EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.7Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A flaw was found in the SAML protocol implementation of Keycloak, an open-source identity and access management solution. The issue occurs when Keycloak handles SAML authentication requests using the HTTP-Redirect binding. If a client is configured with a wildcard redirect URL, an attacker can craft a request that includes malicious parameters. When a user authenticates, Keycloak appends its legitimate response to the attacker's parameters. This can cause some service providers to process the attacker's data instead of the real login information, potentially leading to a user being logged into the wrong account.

CVSS v3
4.7
EG Score
4.7(medium)
EG Risk
21(Track)
EG Risk 21/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity47% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
9%
KEV
Not listed

Published

July 31, 2026

Last Modified

August 7, 2026

Advisory Details (2)

Auto-updated Aug 7, 2026
Patch available. Sources: redhat.
redhat

2508311 – (CVE-2026-18217) CVE-2026-18217 keycloak-services: keycloak-services: SAML HTTP-Redirect binding response preserves query string leading to parameter pollution

https://bugzilla.redhat.com/show_bug.cgi?id=2508311
redhat Patch Available

CVE-2026-18217 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-18217

Vendor Advisories for CVE-2026-18217(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 21× in last 7d / 57× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-20 23:37 UTCEG score recompute
  2. 2026-08-20 23:37 UTCGHSA enrichment
  3. 2026-08-20 22:55 UTCEPSS rescore
  4. 2026-08-19 23:13 UTCEG score recompute
  5. 2026-08-19 23:13 UTCGHSA enrichment
  6. 2026-08-19 17:03 UTCEPSS rescore
  7. 2026-08-18 22:48 UTCEG score recompute
  8. 2026-08-18 22:48 UTCGHSA enrichment
  9. 2026-08-18 13:48 UTCEPSS rescore
  10. 2026-08-17 22:14 UTCEG score recompute
  11. 2026-08-17 22:14 UTCGHSA enrichment
  12. 2026-08-17 13:47 UTCEPSS rescore
  13. 2026-08-16 21:49 UTCEG score recompute
  14. 2026-08-16 21:49 UTCGHSA enrichment
  15. 2026-08-16 14:56 UTCEPSS rescore
  16. 2026-08-16 02:14 UTCEPSS rescore
  17. 2026-08-15 21:24 UTCEG score recompute
  18. 2026-08-15 21:24 UTCGHSA enrichment
  19. 2026-08-15 01:30 UTCEPSS rescore
  20. 2026-08-14 20:59 UTCEG score recompute
  21. 2026-08-14 20:59 UTCGHSA enrichment
  22. 2026-08-13 22:00 UTCEPSS rescore
  23. 2026-08-13 20:34 UTCGHSA enrichment
  24. 2026-08-12 20:09 UTCEG score recompute
  25. 2026-08-12 20:09 UTCGHSA enrichment
Show 32 more
  1. 2026-08-12 13:50 UTCEPSS rescore
  2. 2026-08-11 19:44 UTCEG score recompute
  3. 2026-08-11 19:44 UTCGHSA enrichment
  4. 2026-08-11 13:42 UTCEPSS rescore
  5. 2026-08-11 00:00 UTCEPSS rescore
  6. 2026-08-10 19:20 UTCGHSA enrichment
  7. 2026-08-09 18:55 UTCEG score recompute
  8. 2026-08-09 18:55 UTCGHSA enrichment
  9. 2026-08-09 13:46 UTCEPSS rescore
  10. 2026-08-08 18:31 UTCEG score recompute
  11. 2026-08-08 18:31 UTCGHSA enrichment
  12. 2026-08-08 16:37 UTCEPSS rescore
  13. 2026-08-07 18:06 UTCEG score recompute▲ 1.30
  14. 2026-08-07 18:06 UTCGHSA enrichment
  15. 2026-08-07 18:05 UTCNVD updateCVSS v3 → 4.7 · severity → MEDIUM
  16. 2026-08-06 17:44 UTCEG score recompute
  17. 2026-08-06 17:44 UTCGHSA enrichment
  18. 2026-08-06 13:46 UTCEPSS rescore
  19. 2026-08-05 19:17 UTCEPSS rescore
  20. 2026-08-04 15:10 UTCEPSS rescore
  21. 2026-08-03 16:56 UTCEG score recompute
  22. 2026-08-03 16:56 UTCGHSA enrichment
  23. 2026-08-03 10:35 UTCEPSS rescore
  24. 2026-08-02 02:26 UTCEPSS rescore
  25. 2026-08-01 04:15 UTCEPSS rescore
  26. 2026-07-31 20:23 UTCEG score recompute
  27. 2026-07-31 20:23 UTCGHSA enrichment
  28. 2026-07-31 19:48 UTCEG score recompute
  29. 2026-07-31 19:48 UTCGHSA enrichment
  30. 2026-07-31 08:18 UTCEG score recompute
  31. 2026-07-31 07:28 UTCEG score recompute
  32. 2026-07-31 07:28 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-18217?
CVE-2026-18217 is a medium vulnerability published on July 31, 2026. A flaw was found in the SAML protocol implementation of Keycloak, an open-source identity and access management solution. The issue occurs when Keycloak handles SAML authentication requests using the HTTP-Redirect binding. If a client is configured with a wildcard redirect URL, an attacker can…
When was CVE-2026-18217 disclosed?
CVE-2026-18217 was first published in the National Vulnerability Database on July 31, 2026, with the most recent update on August 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18217 actively exploited?
CVE-2026-18217 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 90.7% of all scored CVEs.
What is the CVSS score of CVE-2026-18217?
CVE-2026-18217 has a CVSS v3 base score of 4.7 (NVD).
How do I remediate CVE-2026-18217?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18217, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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