# CVE-2026-89105: Improper Authentication in HybridTokenAuthenticator of SAP/cloud-security-services-integration-library

> Attackers can gain unauthorized access by using tokens from unintended bindings in the SAP security integration library.

- **Severity:** Medium 4.2 (`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N`)
- **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:** 13 Oct 2026
- **Updated:** 13 Oct 2026
- **Also known as:** GHSA-2v6r-vpfh-4h7c, GHSA-857v-p42q-f3qf

## What is CVE-2026-89105?

CVE-2026-89105 is a medium-severity authentication bypass vulnerability in SAP_SE SAP/cloud-security-services-integration-library, published on 13 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The HybridTokenAuthenticator component of the SAP/cloud-security-services-integration-library accepts tokens from unintended ambient IAS/XSUAA bindings, potentially allowing unauthorized access. This vulnerability allows an attacker to gain unauthorized access to the system by using tokens that should not be accepted, leading to a breach of security.

Weakness: CWE-1188 (Initialization of a Resource with an Insecure Default)

## Which versions are affected by CVE-2026-89105?


## How do I fix CVE-2026-89105?

No fix has been published for CVE-2026-89105 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-89105 being exploited?

There is no known exploitation of CVE-2026-89105 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-89105 and fix it if it is affected.

What it is: CVE-2026-89105 is a medium-severity authentication bypass vulnerability in SAP_SE SAP/cloud-security-services-integration-library, published on 13 Oct 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-2026-89105 in the wild and no public exploit code.

Affected product: SAP_SE SAP/cloud-security-services-integration-library. 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-2026-89105/ (Markdown: https://insights.sbomify.com/CVE-2026-89105/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-89105
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-89105
- OSV: https://osv.dev/vulnerability/CVE-2026-89105

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-89105/
Summaries are generated and may contain mistakes; the official description above is the record.