# CVE-2025-15321: Tanium addressed an improper input validation vulnerability in Tanium Appliance.

> An improper input validation flaw in Tanium Appliance allows attackers to bypass security controls, requiring a patch for mitigation.

- **Severity:** Low 2.7 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Feb 2026
- **Updated:** 6 Feb 2026
- **Also known as:** GHSA-hjqh-mfgj-vjqf

## What is CVE-2025-15321?

CVE-2025-15321 is a low-severity vulnerability in Tanium Appliance, published on 5 Feb 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

Tanium addressed an improper input validation vulnerability in Tanium Appliance.

Weakness: CWE-863 (Incorrect Authorization), CWE-426 (Untrusted Search Path)

## Which versions are affected by CVE-2025-15321?

It affects 1 product.


Products: Tanium Tanos.

## How do I fix CVE-2025-15321?

No fix has been published for CVE-2025-15321 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-15321 being exploited?

There is no known exploitation of CVE-2025-15321 in the wild and no public exploit code.

## Other vulnerabilities in Tanium Appliance

- [CVE-2025-15311](https://insights.sbomify.com/CVE-2025-15311/): Tanium addressed an unauthorized code execution vulnerability in Tanium Appliance. (high 7.8)
- [CVE-2025-15312](https://insights.sbomify.com/CVE-2025-15312/): Tanium addressed an improper output sanitization vulnerability in TanOS. (medium 6.6)
- [CVE-2025-13225](https://insights.sbomify.com/CVE-2025-13225/): Tanium addressed an arbitrary file deletion vulnerability in TanOS. (medium 5.6)
- [CVE-2026-2605](https://insights.sbomify.com/CVE-2026-2605/): Tanium addressed an insertion of sensitive information into log file vulnerability in TanOS. (medium 5.3)
- [CVE-2025-15323](https://insights.sbomify.com/CVE-2025-15323/): Tanium addressed an improper certificate validation vulnerability in Tanium Appliance. (low 3.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-15321 and fix it if it is affected.

What it is: CVE-2025-15321 is a low-severity vulnerability in Tanium Appliance, published on 5 Feb 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-15321 in the wild and no public exploit code.

Affected product: Tanium Appliance. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-15321/ (Markdown: https://insights.sbomify.com/CVE-2025-15321/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-15321
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-15321
- OSV: https://osv.dev/vulnerability/CVE-2025-15321

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-15321/
Summaries are generated and may contain mistakes; the official description above is the record.