CVE-2021-36884Network attack vector

Script execution via unsanitized stored settings

Published Nov 19, 2021 · Updated Apr 28, 2026

Stored XSS in BackupBliss Backup Migration 1.1.5 and earlier allows remote authenticated users to execute scripts in visitors' browsers. The settings handler stores inadequately sanitized email, email-title, and directory values, then renders them in administrative web content. Administrator privileges are required to supply the payload, and another user's interaction triggers script execution with that visitor's browser access.

CVSS severity4.8
Medium
EPSS probability0.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in BackupBliss Backup Migration 1.1.5 and earlier allows remote authenticated users to execute scripts in visitors' browsers. The settings handler stores inadequately sanitized email, email-title, and directory values, then renders them in administrative web content. Administrator privileges are required to supply the payload, and another user's interaction triggers script execution with that visitor's browser access.

The record

CVE
CVE-2021-36884
Published
Nov 19, 2021
Updated
Apr 28, 2026
Vendor
BackupBliss
Product
Backup Migration
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Nov 19, 2021CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 1.1.5 <=1.1.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

BackupBliss · Backup Migrationversion=<= 1.1.5 <=1.1.5

Published CVSS scores

4.8PatchstackCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Cross-site Scripting (XSS)
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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