9.1

CVE-2026-88044: rclone Incorrect Authorization

CVSS: 9.1v3.1CriticalAwaiting analysis
AliasesUBUNTU-CVE-2026-88044DEBIAN-CVE-2026-88044CGA-27xg-j45v-fvh2
Published 10-09-2026Last modified 10-09-2026
Open JSON

Vulnerability summary

CVE-2026-88044 is a critical (CVSS 9.1) Incorrect Authorization vulnerability in rclone. EPSS estimates a 0.49% chance of exploitation in the next 30 days, higher than 40.9% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.1/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.49%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3 · Related 3
OPENSUSE-SU-2026:21897-1SUSE-SU-2026:23855-1SUSE-SU-2026:23863-1

Timeline

  1. 10-09-2026
    PublishedVulnerability first disclosed.
  2. 10-09-2026
    Last modifiedVulnerability information updated.

Description

rclone is a command-line program to sync files and directories to and from different cloud storage providers. From 1.70.0 until 1.75.1, the serve/start RC interface accepts per-server proxyOpt.AuthProxy settings, and the FTP and S3 constructors in cmd/serve/ftp/ftp.go and cmd/serve/s3/server.go incorrectly check the process-global proxy.Opt.AuthProxy value instead. When the global value is empty, the request-local authentication proxy is ignored: FTP falls back to the fixed filesystem with username anonymous and any password, while S3 with AuthKey serves the fixed RC fs rather than the backend selected by the proxy. The dedicated command-line servers that configure the global option are not affected. This issue is fixed in version 1.75.1.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.49%

Chance of exploitation in the next 30 days

Percentile

41%

Versus all other CVEs

30-day change

0.00 pp

From 0.49% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.49%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard3 products
  • telegraf-1.38< 1.38.4-r28
  • telegraf-1.39< 1.39.3-r9
  • telegraf-1.40< 1.40.0-r1
Debian1 product
  • rcloneAll versions (No fix recorded)
Github.com/rclone1 product
  • rclone≥ 1.70.0, < 1.75.1
Rclone1 product
Ubuntu1 product
  • rcloneAll versions (No fix recorded)
Wolfi1 product
  • telegraf-1.38< 1.38.4-r28

6 vendors · 8 products

References

9 links