CVE-2026-55188

HIGHPre-NVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 92% 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
8.2
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.2Exploit: NoneExposed: 0

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

RustFS is a distributed object storage system built in Rust. From 1.0.0-alpha.1 until 1.0.0-beta.9, RustFS contains an authorization bypass in the bucket replication admin API. The ListRemoteTargetHandler handler for listing remote replication targets only checks whether request credentials exist, but does not verify that the caller has replication or administrator permissions. As a result, an authenticated user with no effective bucket or admin permissions can list remote replication target configuration for a bucket. Because the returned BucketTarget objects include remote target credentials, this can disclose replication access keys and secret keys. This vulnerability is fixed in 1.0.0-beta.9.

CVSS v3
8.2
EG Score
8.2(medium)
EPSS
7.8%
KEV
Not listed

Published

June 26, 2026

Last Modified

June 27, 2026

Advisory Details (1)

Auto-updated Jun 26, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

ListRemoteTargetHandler authorization bypass leaks replication target credentials · Advisory · rustfs/rustfs · GitHub

https://github.com/rustfs/rustfs/security/advisories/GHSA-796f-j7xp-hwf4

Weakness Classification(4)

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

Data Freshness Timeline

(refreshed 25× 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. 2026-07-12 20:04 UTCEG score recompute
  2. 2026-07-12 08:30 UTCEG score recompute
  3. 2026-07-12 05:46 UTCEPSS rescore
  4. 2026-07-11 20:56 UTCEG score recompute
  5. 2026-07-11 09:22 UTCEG score recompute
  6. 2026-07-11 08:27 UTCEPSS rescore
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  8. 2026-07-10 21:48 UTCEG score recompute
  9. 2026-07-10 10:14 UTCEG score recompute
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  11. 2026-07-09 19:10 UTCEPSS rescore
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  21. 2026-07-07 12:28 UTCEG score recompute
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  25. 2026-07-06 13:11 UTCEG score recompute
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  1. 2026-07-06 01:34 UTCEG score recompute
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  3. 2026-07-05 02:31 UTCEPSS rescore
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  5. 2026-07-05 02:25 UTCEG score recompute
  6. 2026-07-04 14:51 UTCEG score recompute
  7. 2026-07-04 06:31 UTCEPSS rescore
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  9. 2026-07-04 03:17 UTCEG score recompute
  10. 2026-07-03 15:42 UTCEG score recompute
  11. 2026-07-03 04:07 UTCEG score recompute
  12. 2026-07-02 16:34 UTCEG score recompute
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  14. 2026-07-01 17:25 UTCEG score recompute
  15. 2026-07-01 15:07 UTCEPSS rescore
  16. 2026-07-01 05:52 UTCEG score recompute
  17. 2026-06-30 23:22 UTCEPSS rescore
  18. 2026-06-30 18:18 UTCEG score recompute
  19. 2026-06-30 06:43 UTCEG score recompute
  20. 2026-06-29 19:09 UTCEG score recompute
  21. 2026-06-29 14:06 UTCEPSS rescore
  22. 2026-06-29 14:06 UTCEPSS rescore
  23. 2026-06-29 07:35 UTCEG score recompute
  24. 2026-06-28 20:00 UTCEG score recompute
  25. 2026-06-28 14:07 UTCEPSS rescore
  26. 2026-06-28 08:26 UTCEG score recompute
  27. 2026-06-28 04:56 UTCEPSS rescore
  28. 2026-06-28 04:56 UTCEPSS rescore
  29. 2026-06-27 20:52 UTCEG score recompute
  30. 2026-06-27 09:18 UTCEG score recompute
  31. 2026-06-26 21:44 UTCEG score recompute
  32. 2026-06-26 21:42 UTCNVD updatefirst tracked

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Frequently asked(5)

What is CVE-2026-55188?
CVE-2026-55188 is a high vulnerability published on June 26, 2026. RustFS is a distributed object storage system built in Rust. From 1.0.0-alpha.1 until 1.0.0-beta.9, RustFS contains an authorization bypass in the bucket replication admin API. The ListRemoteTargetHandler handler for listing remote replication targets only checks whether request credentials exist,…
When was CVE-2026-55188 disclosed?
CVE-2026-55188 was first published in the National Vulnerability Database on June 26, 2026, with the most recent update on June 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55188 actively exploited?
CVE-2026-55188 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 7.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-55188?
CVE-2026-55188 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2026-55188?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55188, 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.

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