CVE-2026-21669

Modified Modified - Updated After Analysis

Authenticated Remote Code Execution Vulnerability in Backup Server

Publication date: 2026-03-12

Last updated on: 2026-05-10

Assigner: HackerOne

Description

A vulnerability allowing an authenticated domain user to perform remote code execution (RCE) on the Backup Server.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-03-12

Last Modified

2026-05-10

Generated

2026-07-27

AI Q&A

2026-03-12

EPSS Evaluated

2026-07-25

NVD

CVE-2026-21669

EUVD

EUVD-2026-11579

Affected Vendors & Products

Vendor	Product	Version / Range
veeam	veeam_backup_&_replication	From 13.0.0.496 (inc) to 13.0.1.2067 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-94	The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.
CWE-693	The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.

Attack-Flow Graph

Executive Summary

CVE-2026-21669 is a critical security vulnerability found in Veeam Backup & Replication software versions 13.0.1.1071 and earlier 13.x builds. It allows an authenticated domain user to execute remote code on the Windows-based Backup Server, which means that someone with valid domain credentials can run arbitrary code remotely on the backup server.

This vulnerability has a very high severity score of 9.9 out of 10 according to the CVSS v3.1 rating, indicating it poses a severe security risk.

The issue was discovered during internal testing by Veeam and has been fixed in version 13.0.1.2067.

Detection Guidance

I don't know

Impact Analysis

This vulnerability can have serious impacts because it allows an authenticated domain user to perform remote code execution on the backup server.

An attacker with valid domain credentials could run arbitrary code remotely, potentially taking full control of the backup server.
This could lead to unauthorized access, data theft, data corruption, or disruption of backup services.
Since backup servers often contain critical data and system backups, compromising them could severely affect business continuity and data recovery.

Compliance Impact

I don't know

Mitigation Strategies

The immediate step to mitigate this vulnerability is to update Veeam Backup & Replication to version 13.0.1.2067 or later, as this version contains the fix for CVE-2026-21669.

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