CVE-2026-18217

MEDIUMNVD 4.74.7—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.7 under NVD CVSS v3. EPSS exploit probability: 0.3% (24th percentile of EPSS-scored CVEs). 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: 0.3%CVSS: 4.7Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
4.7MEDIUMmedium confidence
EG Risk
21
EG Risk 21/100CISA SSVC

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%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
24th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

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 13× in last 7d / 62× 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.

Showing the most recent 100 of 155 total refreshes for this CVE.

  1. 2026-10-04 23:21 UTCEPSS rescore
  2. 2026-10-04 06:33 UTCEG score recompute
  3. 2026-10-04 06:33 UTCGHSA enrichment
  4. 2026-10-03 14:25 UTCEPSS rescore
  5. 2026-10-02 16:52 UTCEG score recompute
  6. 2026-10-02 16:52 UTCGHSA enrichment
  7. 2026-10-01 19:49 UTCEPSS rescore
  8. 2026-10-01 02:48 UTCEG score recompute
  9. 2026-10-01 02:48 UTCGHSA enrichment
  10. 2026-09-30 15:02 UTCEPSS rescore
  11. 2026-09-29 15:20 UTCEPSS rescore
  12. 2026-09-29 06:50 UTCEG score recompute
  13. 2026-09-29 06:50 UTCGHSA enrichment
  14. 2026-09-28 13:51 UTCEPSS rescore
  15. 2026-09-27 18:57 UTCEG score recompute
  16. 2026-09-27 18:57 UTCGHSA enrichment
  17. 2026-09-27 13:47 UTCEPSS rescore
  18. 2026-09-26 15:58 UTCEPSS rescore
  19. 2026-09-25 04:53 UTCEG score recompute
  20. 2026-09-25 04:53 UTCGHSA enrichment
  21. 2026-09-23 16:48 UTCEG score recompute
  22. 2026-09-23 16:48 UTCGHSA enrichment
  23. 2026-09-22 13:23 UTCEG score recompute
  24. 2026-09-22 13:23 UTCGHSA enrichment
  25. 2026-09-20 04:32 UTCEG score recompute
Show 75 more
  1. 2026-09-20 04:32 UTCGHSA enrichment
  2. 2026-09-19 04:06 UTCEG score recompute
  3. 2026-09-19 04:06 UTCGHSA enrichment
  4. 2026-09-18 19:27 UTCEPSS rescore
  5. 2026-09-18 01:17 UTCEG score recompute
  6. 2026-09-18 01:17 UTCGHSA enrichment
  7. 2026-09-16 14:07 UTCEPSS rescore
  8. 2026-09-16 11:20 UTCEG score recompute
  9. 2026-09-16 11:20 UTCGHSA enrichment
  10. 2026-09-16 05:14 UTCEPSS rescore
  11. 2026-09-15 09:40 UTCEG score recompute
  12. 2026-09-15 09:40 UTCGHSA enrichment
  13. 2026-09-14 09:15 UTCEG score recompute
  14. 2026-09-14 09:15 UTCGHSA enrichment
  15. 2026-09-13 16:46 UTCEPSS rescore
  16. 2026-09-13 08:50 UTCEG score recompute
  17. 2026-09-13 08:50 UTCGHSA enrichment
  18. 2026-09-12 15:00 UTCEPSS rescore
  19. 2026-09-12 08:24 UTCEG score recompute
  20. 2026-09-12 08:24 UTCGHSA enrichment
  21. 2026-09-11 14:52 UTCEPSS rescore
  22. 2026-09-11 09:36 UTCEPSS rescore
  23. 2026-09-11 07:57 UTCEG score recompute
  24. 2026-09-11 07:57 UTCGHSA enrichment
  25. 2026-09-10 09:34 UTCEPSS rescore
  26. 2026-09-10 07:32 UTCGHSA enrichment
  27. 2026-09-09 07:07 UTCEG score recompute
  28. 2026-09-09 07:06 UTCGHSA enrichment
  29. 2026-09-08 22:00 UTCEPSS rescore
  30. 2026-09-07 19:38 UTCEG score recompute
  31. 2026-09-07 19:38 UTCGHSA enrichment
  32. 2026-09-07 16:01 UTCEPSS rescore
  33. 2026-09-06 19:13 UTCEG score recompute
  34. 2026-09-06 19:13 UTCGHSA enrichment
  35. 2026-09-06 13:47 UTCEPSS rescore
  36. 2026-09-05 18:47 UTCEG score recompute
  37. 2026-09-05 18:47 UTCGHSA enrichment
  38. 2026-09-04 11:21 UTCEG score recompute
  39. 2026-09-04 11:21 UTCGHSA enrichment
  40. 2026-09-04 05:06 UTCEPSS rescore
  41. 2026-09-03 09:13 UTCEG score recompute
  42. 2026-09-03 09:13 UTCGHSA enrichment
  43. 2026-09-02 14:11 UTCEPSS rescore
  44. 2026-09-01 23:51 UTCEG score recompute
  45. 2026-09-01 23:51 UTCGHSA enrichment
  46. 2026-09-01 13:53 UTCEPSS rescore
  47. 2026-09-01 04:39 UTCEPSS rescore
  48. 2026-08-31 23:26 UTCGHSA enrichment
  49. 2026-08-30 22:48 UTCEG score recompute
  50. 2026-08-30 22:48 UTCGHSA enrichment
  51. 2026-08-30 19:17 UTCEPSS rescore
  52. 2026-08-30 01:22 UTCEPSS rescore
  53. 2026-08-29 22:23 UTCEG score recompute
  54. 2026-08-29 22:23 UTCGHSA enrichment
  55. 2026-08-28 21:41 UTCEPSS rescore
  56. 2026-08-28 02:39 UTCEG score recompute
  57. 2026-08-28 02:39 UTCGHSA enrichment
  58. 2026-08-27 14:25 UTCEPSS rescore
  59. 2026-08-27 02:14 UTCEG score recompute
  60. 2026-08-27 02:14 UTCGHSA enrichment
  61. 2026-08-26 14:46 UTCEPSS rescore
  62. 2026-08-26 01:49 UTCEG score recompute
  63. 2026-08-26 01:49 UTCGHSA enrichment
  64. 2026-08-25 13:48 UTCEPSS rescore
  65. 2026-08-25 01:25 UTCEG score recompute
  66. 2026-08-25 01:25 UTCGHSA enrichment
  67. 2026-08-24 00:58 UTCGHSA enrichment
  68. 2026-08-23 00:29 UTCEG score recompute
  69. 2026-08-23 00:29 UTCGHSA enrichment
  70. 2026-08-23 00:19 UTCEPSS rescore
  71. 2026-08-22 00:03 UTCEG score recompute
  72. 2026-08-22 00:03 UTCGHSA enrichment
  73. 2026-08-21 23:49 UTCEPSS rescore
  74. 2026-08-20 23:37 UTCEG score recompute
  75. 2026-08-20 23:37 UTCGHSA enrichment

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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 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 0.3% probability of exploitation in the next 30 days (24th percentile of EPSS-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?
A fix for CVE-2026-18217 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-18217 are linked in the Vendor Advisories panel on this page.

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