CVE-2021-42552Public exploitNetwork attack vector

Reflected XSS via unsanitized login parameters

Published Mar 16, 2022 · Updated Aug 4, 2024

Reflected XSS in Archivista GmbH ArchivistaBox WebClient allows remote attackers to execute JavaScript via a crafted link. The index.pl login form returns query-parameter script fragments without consistently converting the fragments to inert text. Opening the crafted link triggers script execution in the ArchivistaBox page context, exposing browser-visible data to reading or modification.

CVSS severity6.1
Medium
EPSS probability0.67%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Archivista GmbH ArchivistaBox WebClient allows remote attackers to execute JavaScript via a crafted link. The index.pl login form returns query-parameter script fragments without consistently converting the fragments to inert text. Opening the crafted link triggers script execution in the ArchivistaBox page context, exposing browser-visible data to reading or modification.

The record

CVE
CVE-2021-42552
Published
Mar 16, 2022
Updated
Aug 4, 2024
Vendor
Archivista GmbH
Product
ArchivistaBox WebClient
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 16, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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 <2022/I

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Archivista GmbH · ArchivistaBox WebClientversion=unspecified <2022/I

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1Switzerland Government Common Vulnerability ProgramCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001User Execution: Malicious Link

Public exploit references

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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