GHSA-m4g2-2q66-vc9v
Vikunja Vulnerable to XSS Via Task Preview
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
Blast Radius
code.vikunja.io/apiReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.
Description
Summary
The task preview component creates a unparented div. The div's innerHtml is set to the unescaped description of the task
Details
In the TaskGlanceTooltip.vue it temporarily creates a div and sets the innerHtml to the description here. Since there is no escaping on either the server or client side, a malicious user can share a project, create a malicious task, and cause an XSS on hover.
PoC
- Create a project
- Create a task with any description
- Use the api to update the task with a description containing unescaped HTML (ex:
<img src=x onerror="alert(localStorage.getItem('token'))"> - Share the project with any permission level
- Send malicious project to user and ask them to view task
Impact
Any user on an instance can cause an XSS on another
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | code.vikunja.io/api | all versions | No fix |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for code.vikunja.io/api. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Remediation status
No patched version of code.vikunja.io/api has shipped for GHSA-m4g2-2q66-vc9v yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.
Mitigate without a patch
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether GHSA-m4g2-2q66-vc9v is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-m4g2-2q66-vc9v. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-m4g2-2q66-vc9v in your dependencies?
O3 detects GHSA-m4g2-2q66-vc9v across Go dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.