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TI-2026-80211 Aliases CVE-2026-116193GHSA-rw84-9qf5-6h67

Authentication bypass in rclone serve webdav via OPTIONS requests

Priority HIGH 70CWE-200Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Information disclosure
Confidentiality · integrity · availability
Low · None · None
Fix status
Partial Red Hat: 2 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-200.

Summary

The rclone serve webdav component in rclone from 1.64.0 before 1.75.2 skips its authentication check for OPTIONS requests. This exposes sensitive information (CWE-200) because an unauthenticated remote attacker can probe arbitrary paths. By comparing Allow header values, the attacker learns whether files or collections exist, which enables namespace enumeration.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

Rclone from 1.64.0 before 1.75.2 contains an authentication bypass vulnerability in serve webdav that lets unauthenticated attackers skip authentication by sending OPTIONS requests. Attackers can probe arbitrary paths and compare Allow header values to determine whether files or collections exist, enabling namespace enumeration.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00249 16th percentileScored 2026-11-07
Fix Partial rclone (rclone): 1.75.2Red Hat: 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
rclonerclone1.64.0 to before 1.75.21.75.2Patch availableCNA
  • rclone Vendorrclone Affected 1.64.0 to before 1.75.2 Fixed in 1.75.2 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:rclone:rclone:*:*:*:*:*:*:*:*1.64.0 to before 1.75.2Vulnerablerclone
  • cpe:2.3:a:rclone:rclone:*:*:*:*:*:*:*:* Versions 1.64.0 to before 1.75.2 Vulnerable ·rclone

Remediation

Upgrade rclone to 1.75.2, the fixed version. Red Hat lists Cryostat 4 and Red Hat Advanced Cluster Management for Kubernetes 2 as affected without a fix and has no fix plan for either product.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

  • Fix · CNA rclone (rclone) Fixed in 1.75.2

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    rclone 1.75.2

    9 records Highest priority Priority HIGH 4 HIGH, 2 MEDIUM, 3 LOW

    Other records, highest priority first

    • TI-2026-80206 Integer overflow in rclone serve s3 lets attackers exhaust memoryPriority HIGH 70
    • TI-2026-80207 Signature verification bypass in rclone selfupdatePriority HIGH 69
    • TI-2026-80212 Cross-site request forgery in Rclone pCloud OAuth callbackPriority HIGH 68
    Show all 9 records →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Cryostat 4AffectedNo fix yet: Fix deferred
Red Hat Advanced Cluster Management for Kubernetes 2AffectedNo fix yet: Fix deferred

Timeline

  1. 2026-10-25 Threatist record created from CVE-2026-116193
  2. 2026-10-26 Priority changed: MEDIUM → LOW
  3. 2026-10-27 Alias added: GHSA-rw84-9qf5-6h67
  4. 2026-10-29 CISA SSVC decision points changed
  5. 2026-10-29 Priority changed: LOW → HIGH
  6. 2026-11-06 Affected versions changed · Red Hat
  7. 2026-11-06 CVSS score added · Red Hat

References

Advisory 1

  • TI-2026-60044 rclone serve s3: --auth-proxy without --auth-key authenticates nobody - full SigV4 signature bypass CVSS 3.1CRITICAL 9.8
  • TI-2026-29802 RClone: Unauthenticated operations/fsinfo allows attacker-controlled backend instantiation and local command execution CVSS 4.0CRITICAL 9.2
  • TI-2026-29799 Rclone: Unauthenticated options/set allows runtime auth bypass, leading to sensitive operations and command execution CVSS 4.0CRITICAL 9.2
  • TI-2026-42602 Path traversal in rclone CVSS 3.1HIGH 8.8
  • TI-2026-39407 rclone: Unvalidated symlink target in local `--links` — arbitrary file write from an untrusted remote CVSS 3.1HIGH 8.8
  • TI-2026-80206 Integer overflow in rclone serve s3 lets attackers exhaust memory CVSS 4.0MEDIUM 6.9
See all 23 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences