CVE-2021-44202Network attack vector

Authenticated stored XSS via activity details

Published Nov 29, 2021 · Updated Sep 17, 2024

Cross-site scripting in Acronis Cyber Protect 15 before build 28035 allows remote authenticated users to execute script through activity details. Activity-detail content is stored and later rendered without adequate neutralization, allowing attacker-supplied markup or script to run in a viewing user's browser. Exploitation requires an authenticated user who can submit activity data and a victim who opens the affected details, with confidentiality and integrity impact bounded to that web session.

CVSS severity5.4
Medium
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Acronis Cyber Protect 15 before build 28035 allows remote authenticated users to execute script through activity details. Activity-detail content is stored and later rendered without adequate neutralization, allowing attacker-supplied markup or script to run in a viewing user's browser. Exploitation requires an authenticated user who can submit activity data and a victim who opens the affected details, with confidentiality and integrity impact bounded to that web session.

The record

CVE
CVE-2021-44202
Published
Nov 29, 2021
Updated
Sep 17, 2024
Vendor
Acronis
Product
Acronis Cyber Protect 15
Classifications
CWE-79
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 29, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record 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=unspecified <28035

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Acronis · Acronis Cyber Protect 15version=unspecified <28035

Published CVSS scores

3.5NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
5.4NVDCVSS:3.1/AV:N/AC:L/PR:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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