CVE-2026-18218

MEDIUMNVD 5.45.4
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This medium-severity CVE scores 5.4 under NVD CVSS v3. EPSS exploit probability: 0.3% (21st percentile of EPSS-scored CVEs). GitHub Security Advisory CVSS 4.2 is lower than this score; a lower GitHub score revises it only when its advisory is newer than the CVE record's last change, and this advisory (published 2026-07-31) is not newer than that change (2026-09-16), so it does not.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3

Also known asEUVD-2026-51478 (ENISA EUVD) · GHSA-vhxw-j6h3-48jm (GitHub Security Advisories)Source: ENISA EUVD

5.4EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 5.4Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A flaw was found in the TokenManager component of the Keycloak identity management service. When an administrator attempts to revoke tokens for a specific application (client) using a "not-before" policy, the revocation may be silently ignored if the overall security realm already has an older, non-zero revocation policy in place. This issue can allow previously issued tokens to remain valid for refreshing sessions and accessing user information even after an administrator has attempted to invalidate them. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

CVSS v3
5.4
EG Score
5.4MEDIUMmedium confidence
EG Risk
24
EG Risk 24/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity54% × 45%
Impact severity (EG Severity): CVSS 5.4 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
21st
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (5.4): severity, escalated by confirmed exploitation. This CVE's 5.4 is its impact severity (EG Severity), not escalated.

EG Severity
5.4 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-24). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track 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). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 31, 2026

Last Modified

September 16, 2026

Advisory Details (2)

Auto-updated Jul 31, 2026
Patch available. Sources: redhat.
Red Hat

2508313 – (CVE-2026-18218) CVE-2026-18218 keycloak-services: keycloak-services: Client not-before revocation ignored when realm not-before is older but nonzero

https://bugzilla.redhat.com/show_bug.cgi?id=2508313
Red HatMentions a patch (unverified)

cve-details

https://access.redhat.com/security/cve/CVE-2026-18218

Vendor Advisories for CVE-2026-18218(3)

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

Patch Availability(2)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatrhbk/keycloak-rhel9-operator:26.6-202026-09-16redhat
redhatrhbk-openshift-rhel9/rhbk-openshift-rhel92026-09-16redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 51× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 213 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 113 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  2. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  3. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  4. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  5. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  6. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  7. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  8. 2026-10-25 14:45 UTCEG score recompute
  9. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  10. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  11. 2026-10-23 06:00 UTCEG score recompute
  12. 2026-10-23 06:00 UTCVendor advisory
  13. 2026-10-23 06:00 UTCGHSA enrichmentGHSA-vhxw-j6h3-48jm · GitHub CVSS 4.2
  14. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  15. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  16. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  17. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  18. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  19. 2026-10-18 03:59 UTCEG score recompute
  20. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  21. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  22. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  23. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  24. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  25. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.3% · 19th percentile
Show 75 more
  1. 2026-10-12 16:27 UTCEG score recompute
  2. 2026-10-11 20:07 UTCEG score recompute
  3. 2026-10-11 17:20 UTCEG score recompute
  4. 2026-10-11 14:52 UTCEG score recompute
  5. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  6. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  7. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  8. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  9. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  10. 2026-10-06 23:51 UTCEG score recompute
  11. 2026-10-06 23:51 UTCVendor advisory
  12. 2026-10-06 23:51 UTCGHSA enrichmentGHSA-vhxw-j6h3-48jm · GitHub CVSS 4.2
  13. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  14. 2026-10-05 19:57 UTCEG score recompute
  15. 2026-10-05 19:57 UTCVendor advisory
  16. 2026-10-05 19:57 UTCGHSA enrichmentGHSA-vhxw-j6h3-48jm · GitHub CVSS 4.2
  17. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  18. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  19. 2026-10-04 06:33 UTCEG score recompute
  20. 2026-10-04 06:33 UTCVendor advisory
  21. 2026-10-04 06:33 UTCGHSA enrichmentGHSA-vhxw-j6h3-48jm · GitHub CVSS 4.2
  22. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  23. 2026-10-02 16:52 UTCEG score recompute
  24. 2026-10-02 16:52 UTCVendor advisory
  25. 2026-10-02 16:52 UTCGHSA enrichmentGHSA-vhxw-j6h3-48jm · GitHub CVSS 4.2
  26. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  27. 2026-10-01 02:49 UTCEG score recompute
  28. 2026-10-01 02:49 UTCVendor advisory
  29. 2026-10-01 02:49 UTCGHSA enrichmentGHSA-vhxw-j6h3-48jm · GitHub CVSS 4.2
  30. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  31. 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  32. 2026-09-29 06:50 UTCEG score recompute
  33. 2026-09-29 06:50 UTCVendor advisory
  34. 2026-09-29 06:50 UTCGHSA enrichmentGHSA-vhxw-j6h3-48jm · GitHub CVSS 4.2
  35. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  36. 2026-09-27 18:57 UTCEG score recompute
  37. 2026-09-27 18:57 UTCVendor advisory
  38. 2026-09-27 18:57 UTCGHSA enrichmentGHSA-vhxw-j6h3-48jm · GitHub CVSS 4.2
  39. 2026-09-27 13:47 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  40. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  41. 2026-09-25 04:53 UTCEG score recompute
  42. 2026-09-25 04:53 UTCVendor advisory
  43. 2026-09-25 04:53 UTCGHSA enrichmentGHSA-vhxw-j6h3-48jm · GitHub CVSS 4.2
  44. 2026-09-23 16:48 UTCEG score recompute
  45. 2026-09-23 16:48 UTCVendor advisory
  46. 2026-09-23 16:48 UTCGHSA enrichmentGHSA-vhxw-j6h3-48jm · GitHub CVSS 4.2
  47. 2026-09-22 13:23 UTCEG score recompute
  48. 2026-09-22 13:23 UTCVendor advisory
  49. 2026-09-22 13:23 UTCGHSA enrichmentGHSA-vhxw-j6h3-48jm · GitHub CVSS 4.2
  50. 2026-09-20 03:55 UTCEG score recompute
  51. 2026-09-20 03:55 UTCVendor advisory
  52. 2026-09-20 03:55 UTCGHSA enrichmentGHSA-vhxw-j6h3-48jm · GitHub CVSS 4.2
  53. 2026-09-19 04:06 UTCEG score recompute
  54. 2026-09-19 04:06 UTCVendor advisory
  55. 2026-09-19 04:06 UTCGHSA enrichmentGHSA-vhxw-j6h3-48jm · GitHub CVSS 4.2
  56. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  57. 2026-09-18 01:17 UTCEG score recompute
  58. 2026-09-18 01:17 UTCVendor advisory
  59. 2026-09-18 01:17 UTCGHSA enrichmentGHSA-vhxw-j6h3-48jm · GitHub CVSS 4.2
  60. 2026-09-16 19:20 UTCGHSA enrichmentGHSA-vhxw-j6h3-48jm · GitHub CVSS 4.2
  61. 2026-09-16 18:41 UTCGHSA enrichmentGHSA-vhxw-j6h3-48jm · GitHub CVSS 4.2
  62. 2026-09-16 17:11 UTCGHSA enrichmentGHSA-vhxw-j6h3-48jm · GitHub CVSS 4.2
  63. 2026-09-16 15:55 UTCEG score recompute
  64. 2026-09-16 15:55 UTCGHSA enrichmentGHSA-vhxw-j6h3-48jm · GitHub CVSS 4.2
  65. 2026-09-16 14:07 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  66. 2026-09-16 06:56 UTCGHSA enrichmentGHSA-vhxw-j6h3-48jm · GitHub CVSS 4.2
  67. 2026-09-15 07:06 UTCEG score recompute
  68. 2026-09-15 07:06 UTCGHSA enrichmentGHSA-vhxw-j6h3-48jm · GitHub CVSS 4.2
  69. 2026-09-14 06:17 UTCEG score recompute
  70. 2026-09-14 06:17 UTCGHSA enrichmentGHSA-vhxw-j6h3-48jm · GitHub CVSS 4.2
  71. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  72. 2026-09-13 06:27 UTCEG score recompute
  73. 2026-09-13 06:27 UTCGHSA enrichmentGHSA-vhxw-j6h3-48jm · GitHub CVSS 4.2
  74. 2026-09-12 15:00 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  75. 2026-09-12 06:37 UTCEG score recompute

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-18218?
CVE-2026-18218 is a medium-severity vulnerability; its CVE record was published on July 31, 2026. A flaw was found in the TokenManager component of the Keycloak identity management service. When an administrator attempts to revoke tokens for a specific application (client) using a "not-before" policy, the revocation may be silently ignored if the overall security realm already has an older,…
When was CVE-2026-18218 made public?
CVE-2026-18218 was made public on July 24, 2026: that is the date its CVE record's CNA, Red Hat, Inc., gives for when the vulnerability was made public. The CVE record itself was published on July 31, 2026. EchelonGraph's copy of the record carries a last-modified date of September 16, 2026; the record at its source may have been updated since.
Is CVE-2026-18218 actively exploited?
CVE-2026-18218 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (21st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-18218?
CVE-2026-18218 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-18218?
A fix for CVE-2026-18218 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-18218 are linked in the Vendor Advisories panel on this page.

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