VulnSocial

CVE-2026-55189Disclosure

LOWCVSS 7.7 · HIGH

Signal is active with 3 mentions in latest observed window

Immediate actions

  • Patch affected systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

RustFS is a distributed object storage system built in Rust. From 1.0.0-alpha.1 until 1.0.0-beta.9, when the FTP frontend is enabled, the FTP read and probe handlers dispatch directly to the storage backend without ever calling the IAM authorization function that the FTP write/list handlers (and the entire HTTP S3 path) use. As a result, any user who can authenticate to the FTP listener — including a user whose IAM policy contains an explicit Deny on s3:GetObject — can read (RETR) and stat (SIZE/MDTM) any object in any bucket, and probe any bucket (CWD), completely regardless of their IAM policy. This vulnerability is fixed in 1.0.0-beta.9.

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0.5/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-862CWE-863

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Threat summary

  • Patch or workaround signal is available
  • 3 mentions across 1 observed day

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 3 signals
  • Disclosure: 1 classified signal
  • General: 1 classified signal
  • 3 total mentions across 1 day

Deep dive

Activity timeline3 mentions / 1d
01223Mentions · 2026-06-27: 3Patch / Workaround · 2026-06-27: 1Technical Details · 2026-06-27: 306-27
Signal classification3 categories
Disclosure
133.3%
General
133.3%
Patch
133.3%
Referenced assets3 URLs
Full discourse3 posts
  • Hugo | DevOps | Cybersecurity 🇱🇻@HugoValters
    Patch

    #CVE-2026-55189 - Unauthorized data access in #Rustfs #FTP frontend. IAM bypass allows read/stat operations on restricted objects. #CVSS 7.7. Unpatched - disable #FTP or restrict network access immediately. #CVE @RustFSofficial #infosec #cybersecurity #linux More: https://www.valtersit.com/cve/CVE-2026-55189/

    Post summary

    The tweet announces CVE‑2026‑55189 as an unauthorized data‑access flaw in RustFS FTP, warns it is unpatched, and recommends disabling FTP or tightening network access as a workaround.

    0001071
    966 followersView on X
  • Infoflowcloud@infoflowcloud
    Disclosure

    🚨*CVE* CVE-2026-55189 RustFS is a distributed object storage system built in Rust. From 1.0.0-alpha.1 until 1.0.0-beta.9, when the FTP frontend is enabled, the FTP read and probe handlers … https://www.cve.org/CVERecord?id=CVE-2026-55189 ----- Traducción: CVE-2026-55189 Rus… http://infoflow.cloud`

    Post summary

    The post merely announces CVE‑2026‑55189, detailing its impact on RustFS’s FTP frontend in specific versions, and provides a link to the CVE record, but offers no PoC, exploit, or mitigation information.

    0001053
    89 followersView on X
  • CVE@CVEnew
    General

    CVE-2026-55189 RustFS is a distributed object storage system built in Rust. From 1.0.0-alpha.1 until 1.0.0-beta.9, when the FTP frontend is enabled, the FTP read and probe handlers … https://www.cve.org/CVERecord?id=CVE-2026-55189

    Post summary

    The post notes CVE-2026-55189 affects certain RustFS versions when the FTP frontend is enabled, but offers no proof of exploitation, tooling, or remediation.

    000101.1K
    57.7K followersView on X

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