# CVE-2025-8558: Auth bypass in Insider Threat Management (ITM) Server

> Unauthenticated adjacent network users can unregister agents when license limits are exceeded, causing loss of event data and availability.

- **Severity:** Low 2.3 (`CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 3 Nov 2025
- **Updated:** 3 Nov 2025
- **Also known as:** GHSA-5mj6-fm92-ww5m

## What is CVE-2025-8558?

CVE-2025-8558 is a low-severity authentication bypass vulnerability in Proofpoint Insider Threat Management (ITM) Server, published on 3 Nov 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Insider Threat Management (ITM) Server versions prior to 7.17.2 contain an authentication bypass vulnerability that allows unauthenticated users on an adjacent network to perform agent unregistration when the number of registered agents exceeds the licensed limit. Successful exploitation prevents the server from receiving new events from affected agents, resulting in a partial loss of integrity and availability with no impact to confidentiality.

Weakness: CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2025-8558?

It affects 1 product.


Products: Proofpoint Insider Threat Management Server.

## How do I fix CVE-2025-8558?

No fix has been published for CVE-2025-8558 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-8558 being exploited?

There is no known exploitation of CVE-2025-8558 in the wild and no public exploit code.

## Other vulnerabilities in Proofpoint Insider Threat Management (ITM) Server

- [CVE-2021-40842](https://insights.sbomify.com/CVE-2021-40842/): SQL injection in n/a (critical 9.8)
- [CVE-2020-10655](https://insights.sbomify.com/CVE-2020-10655/): Deserialization in n/a (critical 9.8)
- [CVE-2020-10656](https://insights.sbomify.com/CVE-2020-10656/): Deserialization in n/a (critical 9.8)
- [CVE-2020-10658](https://insights.sbomify.com/CVE-2020-10658/): Deserialization in n/a (critical 9.8)
- [CVE-2021-40843](https://insights.sbomify.com/CVE-2021-40843/): Deserialization in n/a (high 7.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-8558 and fix it if it is affected.

What it is: CVE-2025-8558 is a low-severity authentication bypass vulnerability in Proofpoint Insider Threat Management (ITM) Server, published on 3 Nov 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-8558 in the wild and no public exploit code.

Affected product: Proofpoint Insider Threat Management (ITM) Server. 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-2025-8558/ (Markdown: https://insights.sbomify.com/CVE-2025-8558/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-8558
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-8558
- OSV: https://osv.dev/vulnerability/CVE-2025-8558

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-8558/
Summaries are generated and may contain mistakes; the official description above is the record.