# CVE-2026-13773: IBM WebSphere eXtreme Scale is affected by server side request forgery when ORB is used as Transport Protocol

> Attackers can trigger SSRF via ORB transport, potentially escalating to remote code execution on the JVM through chained deserialization flaws.

- **Severity:** Medium 6.0 (`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 30 Jun 2026
- **Updated:** 30 Jun 2026
- **Also known as:** GHSA-hgv4-prq7-c9mx

## What is CVE-2026-13773?

CVE-2026-13773 is a medium-severity server-side request forgery vulnerability in IBM WebSphere Extreme Scale, published on 30 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 Approximately 50 generated CORBA stub classes in WebSphere eXtreme Scale's ogclient.jar call ORB.string_to_object() on an attacker-controlled IOR string during Java deserialization, turning any unfiltered ObjectInputStream sink in WAS into outbound IIOP SSRF to an attacker-chosen host; when chained with the IBM ORB's getUserException class-instantiation flaw (WAS-26), this SSRF escalates to remote code execution on the calling JVM.

Weakness: CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2026-13773?

It affects 1 product.


Products: Ibm Websphere Extreme Scale.

## How do I fix CVE-2026-13773?

No fix has been published for CVE-2026-13773 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-13773 being exploited?

There is no known exploitation of CVE-2026-13773 in the wild and no public exploit code.

## Other vulnerabilities in IBM WebSphere Extreme Scale

- [CVE-2026-13759](https://insights.sbomify.com/CVE-2026-13759/): IBM WebSphere eXtreme Scale is affected by Insecure Deserilization (high 7.5)
- [CVE-2026-13772](https://insights.sbomify.com/CVE-2026-13772/): IBM WebSphere eXtreme Scale's OQL is affected by remote code execution (high 7.5)
- [CVE-2013-5393](https://insights.sbomify.com/CVE-2013-5393/): Auth bypass in n/a (high 7.5)
- [CVE-2026-9002](https://insights.sbomify.com/CVE-2026-9002/): IBM WebSphere eXtremes Scale is affected by uncontrolled resource consumption when XDF is enabled (medium 6.5)
- [CVE-2019-4109](https://insights.sbomify.com/CVE-2019-4109/): Cross-site scripting in WebSphere eXtreme Scale (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-13773 and fix it if it is affected.

What it is: CVE-2026-13773 is a medium-severity server-side request forgery vulnerability in IBM WebSphere Extreme Scale, published on 30 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-13773 in the wild and no public exploit code.

Affected product: IBM WebSphere Extreme Scale. 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-2026-13773/ (Markdown: https://insights.sbomify.com/CVE-2026-13773/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-13773
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-13773
- OSV: https://osv.dev/vulnerability/CVE-2026-13773

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-13773/
Summaries are generated and may contain mistakes; the official description above is the record.