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MEDIUM severity

Leantime affected by Improper Neutralization of HTML TagsGHSA-95j3-435g-vjcp

MEDIUMFix: Leantime/leantime@ce1d207

GHSA-95j3-435g-vjcp is a medium-severity (CVSS 6.5) Cross-site Scripting (XSS) vulnerability in leantime/leantime. A fix is available for leantime/leantime — see the affected versions and patch details below.

Also known asCVE-2025-28254
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 9, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-95j3-435g-vjcp.

EPSS Exploitation Probability

via FIRST.org ↗
0.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs27th percentile — riskier than 27% of all scored CVEsHighest risk
0.00%0.32%0.64%0.97%0.2%0.3%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐘leantime/leantime

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

Summary

HTML can be arbitrarily injected into emails from Leantime due to improper neutralization of HTML tags in users' first names. This effectively allows for the creation of phishing emails from a Leantime instance's email address.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistleantime/leantimeall versions3.3composer require leantime/leantime:^3.3

Affected Products

1 product · 1 configurations
Application
leantimeleantime
< 3.3.0
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for leantime/leantime, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update leantime/leantime to 3.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-95j3-435g-vjcp is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

### Summary HTML can be arbitrarily injected into emails from Leantime due to improper neutralization of HTML tags in users' first names. This effectively allows for the creation of phishing emails from a Leantime instance's email address.
O3 Security · Impact-Aware SCA

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Leantime affected by Improper Neutralization of HTML Tags