Vulnerability · Published Jan 8, 2026 · Assigned by GitHub_M

CVE-2026-22042RustFS has IAM Incorrect Authorization in ImportIam that Allows Privilege Escalation

Medium 5.7

In plain English

A medium-severity incorrect authorization in rustfs from rustfs. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities).

Severity (CVSS 4.0)5.7Medium

Exploit odds (30 days)0.4%top 62.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

RustFS is a distributed object storage system built in Rust. Prior to version 1.0.0-alpha.79, he `ImportIam` admin API validates permissions using `ExportIAMAction` instead of `ImportIAMAction`, allowing a principal with export-only IAM permissions to perform import operations. Since importing IAM data performs privileged write actions (creating/updating users, groups, policies, and service accounts), this can lead to unauthorized IAM modification and privilege escalation. Version 1.0.0-alpha.79 fixes the issue.

Affected products (as reported)

Vendor	Product	Versions
rustfs	rustfs	< 1.0.0-alpha.79

Weakness: CWE-285, CWE-863 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P

References

https://github.com/rustfs/rustfs/security/advisories/GHSA-vcwh-pff9-64cc x_refsource_CONFIRM