# CVE-2026-11538: IBM WebSphere Application Server prior to 9.0.5.29 and 8.5.5.31 are affected by multiple vulnerabilities

> Attackers can inject malicious content into logs via crafted LTPA token cookies in IBM WebSphere Application Server.

- **Severity:** Low 3.7 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Sep 2026
- **Updated:** 18 Sep 2026
- **Also known as:** GHSA-wgpc-w629-m235

## What is CVE-2026-11538?

CVE-2026-11538 is a low-severity vulnerability in Ibm Websphere Application Server, published on 18 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

IBM WebSphere Application Server 9.0 and 8.5 is affected by a log injection vulnerability through crafted LTPA token cookies.

Weakness: CWE-117 (Improper Output Neutralization for Logs)

## Which versions are affected by CVE-2026-11538?

It affects 1 product.


Products: Ibm Websphere Application Server.

## How do I fix CVE-2026-11538?

No fix has been published for CVE-2026-11538 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-11538 being exploited?

There is no known exploitation of CVE-2026-11538 in the wild and no public exploit code.

## Other vulnerabilities in Ibm Websphere Application Server

- [CVE-2015-1920](https://insights.sbomify.com/CVE-2015-1920/): Code injection in n/a (critical 10.0)
- [CVE-2013-0462](https://insights.sbomify.com/CVE-2013-0462/): Other in n/a (critical 10.0)
- [CVE-2011-1377](https://insights.sbomify.com/CVE-2011-1377/): Security feature bypass in n/a (critical 10.0)
- [CVE-2010-3186](https://insights.sbomify.com/CVE-2010-3186/): Other in n/a (critical 10.0)
- [CVE-2009-1899](https://insights.sbomify.com/CVE-2009-1899/): Information disclosure in n/a (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-11538 and fix it if it is affected.

What it is: CVE-2026-11538 is a low-severity vulnerability in Ibm Websphere Application Server, published on 18 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-11538 in the wild and no public exploit code.

Affected product: Ibm Websphere Application 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-2026-11538/ (Markdown: https://insights.sbomify.com/CVE-2026-11538/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-11538
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-11538
- OSV: https://osv.dev/vulnerability/CVE-2026-11538

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-11538/
Summaries are generated and may contain mistakes; the official description above is the record.