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CVE Record

CVE-2026-41179: RClone: Unauthenticated operations/fsinfo allows attacker-controlled backend instantiation and local command execution

Rclone is a command-line program to sync files and directories to and from different cloud storage providers. Starting in version 1.48.0 and prior to version 1.73.5, the RC endpoint `operations/fsinfo` is exposed without `AuthRequired: true` and accepts attacker-controlled `fs` input. Because `rc.GetFs(...)` supports inline backend definitions, an unauthenticated attacker can instantiate an attacker-controlled backend on demand. For the WebDAV backend, `bearer_token_command` is executed during backend initialization, making single-request unauthenticated local command execution possible on reachable RC deployments without global HTTP authentication. Version 1.73.5 patches the issue.

CriticalCVSS 9.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysiscritical

Security readout for executives and security teams

Plain-English summary

CVE-2026-41179 lets an unauthenticated network user potentially make a reachable rclone remote-control service run local commands. It affects rclone 1.48.0 through 1.73.4 when RC is reachable and lacks global HTTP authentication. Exposed deployments should be treated as urgent.

Executive priority

Prioritize exposed RC services immediately. This is critical because no credentials or user interaction are required, and successful exploitation can lead to local command execution on the rclone host.

Technical view

The RC operations/fsinfo endpoint accepted attacker-controlled fs input without endpoint-level authentication. rc.GetFs supports inline backend definitions; the WebDAV backend can execute bearer_token_command during backend initialization. The advisory says rclone 1.73.5 patches this by requiring authentication for the vulnerable operation.

Likely exposure

Highest risk is internet- or network-reachable rclone RC deployments running versions >=1.48.0 and <1.73.5 without global HTTP authentication. Local-only or authenticated RC services have materially lower exposure, but should still be upgraded.

Exploitation context

The provided sources support single-request unauthenticated local command execution on reachable unauthenticated RC deployments. KEV is false, and the bundle does not provide evidence of active exploitation in the wild.

Researcher notes

Evidence ties the issue to missing AuthRequired on operations/fsinfo, inline backend creation through rc.GetFs, and WebDAV initialization behavior. Avoid assuming other backend execution paths unless independently confirmed.

Mitigation direction

  • Upgrade rclone to version 1.73.5 or later.
  • Require authentication for any rclone RC HTTP service.
  • Restrict RC access to trusted hosts or private management networks.
  • Disable RC exposure where remote control is not operationally required.
  • Check vendor advisories for downstream package fixes.

Validation and detection

  • Inventory rclone installations and record exact versions.
  • Identify systems running the rclone RC HTTP interface.
  • Confirm RC is not reachable from untrusted networks.
  • Verify global HTTP authentication is enforced on RC services.
  • Confirm upgraded instances are running 1.73.5 or later.
Prepared
Confidence
high
Sources
10

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · medium confidence lookup

CWE-306: Credential and account abuse lookup

Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
cwe · medium confidence lookup

CWE-78: Command execution behavior lookup

Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cwe · medium confidence lookup

CWE-94: Code execution behavior lookup

Code execution and unsafe deserialization weaknesses often justify reviewing execution behavior and process telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cve · low confidence lookup

CVE-2026-41179 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Critical
CVSS
9.8 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
5Timeline events
2ADP providers
11Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: pocAutomatable: yesTechnical Impact: total

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
9.8CVSS 3.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9redhat-SADP
9.2CVSS 4.0CriticalCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N——GitHub_M

Vulnerability scoring details

Base CVSS 4.0 score

9.2Critical
CVSS 4.0 vector shape for CVE-2026-41179Attack VectorAttack ComplexityAttack RequirementsPrivileges RequiredUser InteractionVS ConfidentialityVS IntegrityVS AvailabilitySS ConfidentialitySS IntegritySS Availability

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Attack Requirements
NonePresent
Privileges Required
NoneLowHigh
User Interaction
NonePassiveActive
VS Confidentiality
HighLowNone
VS Integrity
HighLowNone
VS Availability
HighLowNone
SS Confidentiality
HighLowNone
SS Integrity
HighLowNone
SS Availability
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. ADP timelineredhat-SADP

    Made public.

  3. CVE publishedCVE Program

    The CVE record was published.

  4. ADP timelineredhat-SADP

    Reported to Red Hat.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
redhat-SADPgithub.com/rclone/rclone: Rclone: Unauthenticated local command execution via exposed RC endpoint
other:Red Hat severity ratingcvssV3_1
  • 2026-04-23T01:01:06.930Z: Reported to Red Hat.
  • 2026-04-23T00:03:36.282Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
rclonerclone>= 1.48.0, < 1.73.5Listed
Weakness

CWE details

CWE-306CWE-78CWE-94

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.