Medium severity · published Feb 25, 2026
CVE-2026-27822
Rust has Critical Stored XSS in Preview Modal, leading to Administrative Account Takeover
5.4
CVSS
5.1%
EPSS
No
On KEV
Description
RustFS is a distributed object storage system built in Rust. Prior to version 1.0.0-alpha.83, a Stored Cross-Site Scripting (XSS) vulnerability in the RustFS Console allows an attacker to execute arbitrary JavaScript in the context of the management console. By bypassing the PDF preview logic, an attacker can steal administrator credentials from `localStorage`, leading to full account takeover and system compromise. Version 1.0.0-alpha.83 fixes the issue.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)5.1% · higher than 92% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RU
rustfs · rustfs
< 1.0.0-alpha.83 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-27822
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-27822
Exploit
https://github.com/rustfs/rustfs/security/advisories/GHSA-v9fg-3cr2-277j
More from rustfs
9.8
CVE-2026-45039
RustFS: Internode RPC HMAC secret falls back to public default credential, enabling peer impersonation
9.8
CVE-2026-22043
RustFS has IAM deny_only Short-Circuit that Allows Privilege Escalation via Service Account Minting
9.8
CVE-2025-68705
RustFS Path Traversal Vulnerability
9.8
CVE-2025-68926
RustFS has a gRPC Hardcoded Token Authentication Bypass
9.3
CVE-2026-45043
RustFS: ImportIam Allows Creation of Backdoor Service Accounts Under Any Parent Including Root