# CVE-2026-111687: WeRSS (we-mp-rss) through 1.5.3 RCE via template Parameter in /rss Endpoint

> Unauthenticated attackers can execute arbitrary code via the template parameter in the public RSS endpoint of WeRSS.

- **Severity:** Critical 9.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Oct 2026
- **Updated:** 16 Oct 2026
- **Also known as:** GHSA-hp95-p2ww-6rvc

## What is CVE-2026-111687?

CVE-2026-111687 is a critical code injection vulnerability in rachelos we-mp-rss, published on 16 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

WeRSS (we-mp-rss) through 1.5.3 contains a remote code execution vulnerability that allows unauthenticated attackers to run code via the template parameter of the public GET /rss/{feed_id} endpoint. Attackers can supply a non-built-in ext value and a {{=expression}} template whose object-subclass traversal bypasses the eval denylist to run OS commands as the service account.

Weakness: CWE-95 (Improper Neutralization of Directives in Dynamically Evaluated Code)

## Which versions are affected by CVE-2026-111687?


## How do I fix CVE-2026-111687?

No fix has been published for CVE-2026-111687 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-111687 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-111687 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-111687 and fix it if it is affected.

What it is: CVE-2026-111687 is a critical code injection vulnerability in rachelos we-mp-rss, published on 16 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-111687 exists.

Affected product: rachelos we-mp-rss. 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-2026-111687/ (Markdown: https://insights.sbomify.com/CVE-2026-111687/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-111687
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-111687
- OSV: https://osv.dev/vulnerability/CVE-2026-111687

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-111687/
Summaries are generated and may contain mistakes; the official description above is the record.