CVE-2021-3693Network attack vector

Script execution via unvalidated URL fragment

Published Aug 23, 2021 · Updated Aug 3, 2024

DOM-based XSS in LedgerSMB allows remote attackers to execute script via a crafted URL opened by an authenticated user. The single-page interface treats the URL hash fragment as an in-application location without verifying its origin, then merges the fetched HTML into the main browser DOM. Exploitation requires an authenticated user to open the link; a sufficiently privileged target and sophisticated payload can expose accounting data or issue application requests through that user's session.

CVSS severity7.1
High
EPSS probability3.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

DOM-based XSS in LedgerSMB allows remote attackers to execute script via a crafted URL opened by an authenticated user. The single-page interface treats the URL hash fragment as an in-application location without verifying its origin, then merges the fetched HTML into the main browser DOM. Exploitation requires an authenticated user to open the link; a sufficiently privileged target and sophisticated payload can expose accounting data or issue application requests through that user's session.

The record

CVE
CVE-2021-3693
Published
Aug 23, 2021
Updated
Aug 3, 2024
Vendor
LedgerSMB
Product
LedgerSMB
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 23, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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 <1.8.18

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

LedgerSMB · LedgerSMBversion=unspecified <1.8.18

Published CVSS scores

7.1LedgerSMB ProjectCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

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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