# CVE-2025-27155: In-memory stored Cross-site scripting (XSS) vulnerability in pineconesim

> An attacker can inject malicious scripts into the Pinecone simulator interface, potentially executing code in the victim's browser context.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 4 Mar 2025
- **Updated:** 4 Mar 2025
- **Also known as:** GHSA-fr62-mg2q-7wqv, GO-2025-3500

## What is CVE-2025-27155?

CVE-2025-27155 is a medium-severity cross-site scripting vulnerability in matrix-org pinecone, published on 4 Mar 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Pinecone is an experimental overlay routing protocol suite which is the foundation of the current P2P Matrix demos. The Pinecone Simulator (pineconesim) included in Pinecone up to commit ea4c337 is vulnerable to stored cross-site scripting. The payload storage is not permanent and will be wiped when restarting pineconesim.

Weakness: CWE-80 (Improper Neutralization of Script-Related HTML Tags in a Web Page), CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2025-27155?

3 open source packages ship an affected version, including github.com/matrix-org/pinecone.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `github.com/matrix-org/pinecone` | Go | All versions | None |
| `github.com/matrix-org/pinecone` | Go | All versions to 0.11.0 | None |
| `github.com/matrix-org/pinecone` | Go | All versions to 0.11.0 | None |

## How do I fix CVE-2025-27155?

Apply the vendor's patch.

## Is CVE-2025-27155 being exploited?

There is no known exploitation of CVE-2025-27155 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-27155 and fix it if it is affected.

What it is: CVE-2025-27155 is a medium-severity cross-site scripting vulnerability in matrix-org pinecone, published on 4 Mar 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2025-27155 in the wild and no public exploit code.

Affected packages and fixed versions:
- github.com/matrix-org/pinecone (Go): affected all versions; no fix listed
- github.com/matrix-org/pinecone (Go): affected all versions up to 0.11.0; no fix listed
- github.com/matrix-org/pinecone (Go): affected all versions up to 0.11.0; no fix listed

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-2025-27155/ (Markdown: https://insights.sbomify.com/CVE-2025-27155/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-27155
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-27155
- OSV: https://osv.dev/vulnerability/CVE-2025-27155

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-27155/
Summaries are generated and may contain mistakes; the official description above is the record.