# CVE-2015-2556: XML external entity in n/a

> Remote attackers can read arbitrary files on Microsoft SharePoint Server via XML External Entity injection in InfoPath Forms Services.

- **Severity:** Medium 4.3 (`AV:N/AC:M/Au:N/C:P/I:N/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:** 14 Oct 2015
- **Updated:** 6 Aug 2024
- **Also known as:** GHSA-c758-mgr5-grgx

## What is CVE-2015-2556?

CVE-2015-2556 is a medium-severity vulnerability in Microsoft Sharepoint Server, published on 14 Oct 2015. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The InfoPath Forms Services component in Microsoft SharePoint Server 2007 SP3 and 2010 SP2 misparses DTDs, which allows remote attackers to read arbitrary files via an XML document containing an external entity declaration in conjunction with an entity reference, related to an XML External Entity (XXE) issue, aka "Microsoft SharePoint Information Disclosure Vulnerability."

Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2015-2556?

It affects 1 product.


Products: Microsoft Sharepoint Server.

## How do I fix CVE-2015-2556?

No fix has been published for CVE-2015-2556 yet. Limit exposure of the affected software until one is available.

## Is CVE-2015-2556 being exploited?

There is no known exploitation of CVE-2015-2556 in the wild and no public exploit code.

## Other vulnerabilities in Microsoft Sharepoint Server

- [CVE-2026-50522](https://insights.sbomify.com/CVE-2026-50522/): Microsoft SharePoint Deserialization of Untrusted Data Vulnerability (critical 9.8, exploited in the wild)
- [CVE-2026-58644](https://insights.sbomify.com/CVE-2026-58644/): Microsoft SharePoint Deserialization of Untrusted Data (critical 9.8, exploited in the wild)
- [CVE-2026-20963](https://insights.sbomify.com/CVE-2026-20963/): Microsoft SharePoint Deserialization of Untrusted Data (critical 9.8, exploited in the wild)
- [CVE-2025-53770](https://insights.sbomify.com/CVE-2025-53770/): Microsoft SharePoint Deserialization of Untrusted Data (critical 9.8, exploited in the wild)
- [CVE-2023-29357](https://insights.sbomify.com/CVE-2023-29357/): Microsoft SharePoint Server Privilege Escalation (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2015-2556 and fix it if it is affected.

What it is: CVE-2015-2556 is a medium-severity vulnerability in Microsoft Sharepoint Server, published on 14 Oct 2015. 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-2015-2556 in the wild and no public exploit code.

Affected product: Microsoft Sharepoint 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-2015-2556/ (Markdown: https://insights.sbomify.com/CVE-2015-2556/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2015-2556
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2015-2556
- OSV: https://osv.dev/vulnerability/CVE-2015-2556

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From sbomify Insights: https://insights.sbomify.com/CVE-2015-2556/
Summaries are generated and may contain mistakes; the official description above is the record.