CVE-2026-0871

MEDIUMPre-NVD 4.94.9—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 77% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
4.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.9Exploit: None knownExposed: 0

A fix is available — apply it.

A flaw was found in Keycloak. An administrator with manage-users permission can bypass the "Only administrators can view" setting for unmanaged attributes, allowing them to modify these attributes. This improper access control can lead to unauthorized changes to user profiles, even when the system is configured to restrict such modifications.

CVSS v3
4.9
EG Score
4.9(medium)
EG Risk
27(Track)
EG Risk 27/100SSVC: 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
Severity49% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
24%
KEV
Not listed

Published

February 27, 2026

Last Modified

June 17, 2026

Advisory Details (4)

Auto-updated Aug 4, 2026
Patch available. Sources: redhat.
redhat

2428881 – (CVE-2026-0871) CVE-2026-0871 org.keycloak/keycloak-services: Keycloak: Unauthorized modification of unmanaged user attributes by administrators

https://bugzilla.redhat.com/show_bug.cgi?id=2428881
redhat Patch Available

CVE-2026-0871 - 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-2026-0871
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:2366
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:2365

Vendor Advisories for CVE-2026-0871(1)

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 / EcosystemFixed in / PatchReleasedSource
redhatrhbk/keycloak-rhel9-operator:26.4-102026-02-09redhat
redhatrhbk/keycloak-rhel92026-02-09redhat

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.

Affected Packages

(1 across 1 ecosystem)
Maven(1)
PackageVulnerable rangeFixed inDependents
org.keycloak:keycloak-server-spi-private10.0.0 ... 9.0.3 (158 versions)26.5.2—

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 5× in last 7d / 23× 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. 2026-09-18 19:27 UTCEPSS rescore
  2. 2026-09-18 19:06 UTCOSV refresh
  3. 2026-09-16 05:14 UTCEPSS rescore
  4. 2026-09-13 16:46 UTCEPSS rescore
  5. 2026-09-12 15:00 UTCEPSS rescore
  6. 2026-09-11 09:36 UTCEPSS rescore
  7. 2026-09-10 09:34 UTCEPSS rescore
  8. 2026-09-08 22:00 UTCEPSS rescore
  9. 2026-09-07 16:01 UTCEPSS rescore
  10. 2026-09-06 13:47 UTCEPSS rescore
  11. 2026-09-04 05:06 UTCEPSS rescore
  12. 2026-09-02 14:11 UTCEPSS rescore
  13. 2026-09-01 13:53 UTCEPSS rescore
  14. 2026-09-01 04:39 UTCEPSS rescore
  15. 2026-08-30 22:17 UTCOSV refresh
  16. 2026-08-30 19:17 UTCEPSS rescore
  17. 2026-08-30 01:21 UTCEPSS rescore
  18. 2026-08-28 21:40 UTCEPSS rescore
  19. 2026-08-27 14:24 UTCEPSS rescore
  20. 2026-08-25 13:48 UTCEPSS rescore
  21. 2026-08-23 00:19 UTCEPSS rescore
  22. 2026-08-21 23:48 UTCEPSS rescore
  23. 2026-08-20 22:55 UTCEPSS rescore
  24. 2026-08-19 17:03 UTCEPSS rescore
  25. 2026-08-18 13:48 UTCEPSS rescore
Show 40 more
  1. 2026-08-16 14:56 UTCEPSS rescore
  2. 2026-08-16 02:14 UTCEPSS rescore
  3. 2026-08-15 01:30 UTCEPSS rescore
  4. 2026-08-14 08:50 UTCEG score recompute
  5. 2026-08-14 08:50 UTCVendor advisory
  6. 2026-08-13 22:00 UTCEPSS rescore
  7. 2026-08-13 00:48 UTCEG score recompute
  8. 2026-08-13 00:48 UTCVendor advisory
  9. 2026-08-12 13:50 UTCEPSS rescore
  10. 2026-08-11 13:42 UTCEPSS rescore
  11. 2026-08-11 06:27 UTCEG score recompute
  12. 2026-08-11 06:27 UTCVendor advisory
  13. 2026-08-10 23:59 UTCEPSS rescore
  14. 2026-08-10 08:30 UTCEG score recompute
  15. 2026-08-10 08:30 UTCVendor advisory
  16. 2026-08-09 13:46 UTCEPSS rescore
  17. 2026-08-09 08:28 UTCEG score recompute
  18. 2026-08-09 08:28 UTCVendor advisory
  19. 2026-08-08 16:37 UTCEPSS rescore
  20. 2026-08-07 20:29 UTCEG score recompute
  21. 2026-08-07 20:29 UTCVendor advisory
  22. 2026-08-06 13:46 UTCEPSS rescore
  23. 2026-08-06 02:55 UTCEG score recompute
  24. 2026-08-06 02:55 UTCVendor advisory
  25. 2026-08-05 19:17 UTCEPSS rescore
  26. 2026-08-04 15:09 UTCEPSS rescore
  27. 2026-08-04 10:38 UTCEPSS rescore
  28. 2026-08-04 04:54 UTCEG score recompute
  29. 2026-08-04 04:54 UTCVendor advisory
  30. 2026-08-03 10:35 UTCEPSS rescore
  31. 2026-08-02 19:22 UTCEG score recompute
  32. 2026-08-02 19:22 UTCVendor advisory
  33. 2026-08-02 02:26 UTCEPSS rescore
  34. 2026-08-01 04:15 UTCEPSS rescore
  35. 2026-07-30 16:27 UTCEPSS rescore
  36. 2026-07-28 15:36 UTCEPSS rescore
  37. 2026-07-27 14:13 UTCEPSS rescore
  38. 2026-07-27 14:04 UTCEG score recompute
  39. 2026-07-27 14:04 UTCVendor advisory
  40. 2026-07-27 13:55 UTCOSV refresh

Frequently asked(5)

What is CVE-2026-0871?
CVE-2026-0871 is a medium vulnerability published on February 27, 2026. A flaw was found in Keycloak. An administrator with manage-users permission can bypass the "Only administrators can view" setting for unmanaged attributes, allowing them to modify these attributes. This improper access control can lead to unauthorized changes to user profiles, even when the system…
When was CVE-2026-0871 disclosed?
CVE-2026-0871 was first published in the National Vulnerability Database on February 27, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-0871 actively exploited?
CVE-2026-0871 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 76.3% of all scored CVEs.
What is the CVSS score of CVE-2026-0871?
CVE-2026-0871 has a CVSS v3 base score of 4.9 (NVD).
How do I remediate CVE-2026-0871?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-0871, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-0871

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