CVE-2021-41156Network attack vector

Reflected XSS via unvalidated browser_today field

Published Oct 18, 2021 · Updated Aug 4, 2024

Reflected XSS in Anuko Time Tracker 1.19.30.5600 and earlier allows remote authenticated users to execute JavaScript via browser_today. Seven POST handlers accept browser_today without checking its expected YYYY-MM-DD form, then reflect attacker-controlled script into the response. Exploitation requires a logged-in user to submit an attacker-crafted HTML form, after which script runs in that user's browser context.

CVSS severity6.8
Medium
EPSS probability0.49%
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 Anuko Time Tracker 1.19.30.5600 and earlier allows remote authenticated users to execute JavaScript via browser_today. Seven POST handlers accept browser_today without checking its expected YYYY-MM-DD form, then reflect attacker-controlled script into the response. Exploitation requires a logged-in user to submit an attacker-crafted HTML form, after which script runs in that user's browser context.

The record

CVE
CVE-2021-41156
Published
Oct 18, 2021
Updated
Aug 4, 2024
Vendor
Anuko International Ltd.
Product
Anuko Time Tracker
Classifications
CWE-79, T1204
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 18, 2021CVE 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=< 1.19.30.5601

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Anuko International Ltd. · Anuko Time Trackerversion=< 1.19.30.5601

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
6.8GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/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')
T1204User Execution

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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