---
id: CVE-2026-111687
title: >-
  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
summary: >-
  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
  ex…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-95
vendor: rachelos
product: we-mp-rss
affected:
  - we-mp-rss <= 1.5.3
published: '2026-10-16'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T20:17:22.260'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-111687'
references:
  - url: 'https://github.com/rachelos/we-mp-rss/blob/v1.5.3/apis/rss.py#L185-L198'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/rachelos/we-mp-rss/blob/v1.5.3/core/lax/template_parser.py#L1150-L1166
    label: disclosure@vulncheck.com
  - url: 'https://hackmd.io/@hieuPenguinnn/werss-rss-template-unauth-ssti-rce'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/werss-we-mp-rss-through-1.5.3-rce-via-template-parameter-in-rss-endpoint
    label: disclosure@vulncheck.com
  - url: 'https://hackmd.io/@hieuPenguinnn/werss-rss-template-unauth-ssti-rce'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.01003
epssPercentile: 0.62726
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-10-16T19:04:57.256748Z'
ingestedAt: '2026-10-16T18:43:08.657Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.