CVE-2021-41156: Reflected XSS vulnerability

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-10-18 · updated 2026-06-17
Weakness: CWE-79

Description

anuko/timetracker is an, open source time tracking system. In affected versions Time Tracker uses browser_today hidden control on a few pages to collect the today's date from user browsers. Because of not checking this parameter for sanity in versions prior to 1.19.30.5601, it was possible to craft an html form with malicious JavaScript, use social engineering to convince logged on users to execute a POST from such form, and have the attacker-supplied JavaScript to be executed in user's browser. This has been patched in version 1.19.30.5600. Upgrade is recommended. If it is not practical, introduce ttValidDbDateFormatDate function as in the latest version and add a call to it within the access checks block.

Affected products

Timetracker Project Timetracker: before 1.19.30.5601 — fixed in 1.19.30.5601

How to fix

Upgrade to a fixed version: Timetracker Project Timetracker 1.19.30.5601. Check the vendor advisory for mitigations.

References

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