RCE in Rachelos We-Mp-Rss
CVE-2026-111687
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- hackmd.io/@hieuPenguinnn/werss-rss-template-unauth-ssti-rce (third-party-advisory)
- github.com/rachelos/we-mp-rss/blob/v1.5.3/core/lax/template_parser.py (technical-description)
- github.com/rachelos/we-mp-rss/blob/v1.5.3/apis/rss.py (technical-description)
- www.vulncheck.com/advisories/werss-we-mp-rss-through-1.5.3-rce-via-template-par… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-111687?
- CVE-2026-111687 is a critical-severity vulnerability in Rachelos We-Mp-Rss, classified under Eval Injection. CVSS score: 9.8/10. Published 2026-10-16.
- How severe is CVE-2026-111687?
- Critical severity. CVSS v3 base score is 9.8 out of 10.