Leantime allows Stored Cross-Site Scripting (XSS)
Summary
Stored XSS, also known as persistent XSS, is the more damaging of the two. It occurs when a malicious script is injected directly into a vulnerable web application.
Details
A Stored Cross-Site Scripting (XSS) vulnerability was found that could potentially compromise user data and pose a significant security risk to the platform.
PoC
- Create a project
- Navigate to project
- Visit to the integration
- Add malicious payload inside the webhook and save it.
- Notice the alert dialogue indicating successful execution of the XSS payload.
'';!--" onfocus=alert(0) autofocus="" onload=alert(3);="&{(alert(1))}" |="" mufazmi"="'';!--" onfocus=alert(0) autofocus="" onload=alert(3);=>>"&{(alert(1))}" |="">> mufazmi"=">>POC
Impact
This XSS vulnerability allows an attacker to execute malicious scripts in the context of a victim's browser when they click on a specially crafted link. This could lead to various malicious activities, including session hijacking, stealing sensitive information such as cookies or login credentials, and potentially compromising the entire platform's security.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | leantime/leantime | <= 3.1.4 | no fix |
References
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N- Weakness (CWE)
CWE-79- Platform
- Composer
- Package
leantime/leantime- Disclosed
- 21.02.2025
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-63cr-xg3f-8jvr - CC BY 4.0
Vulnerability history: leantime/leantime
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 12
- First → latest
- 02.2025 03.2026
- Without a fix
- 1
- Exploited in attacks
- 0
Severity breakdown
- High 2
- Medium 8
- Low 2
Disclosures per year
- 2025: 11
- 2026: 1
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Leantime allows Stored Cross-Site Scripting (XSS) this entry
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