Critical severity · published Oct 16, 2026
CVE-2026-111687
WeRSS (we-mp-rss) through 1.5.3 RCE via template Parameter in /rss Endpoint
9.8
CVSS
1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.0% · higher than 63% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WE
we-mp-rss · rachelos
through 1.5.3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-111687
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-111687
github.com
https://github.com/rachelos/we-mp-rss/blob/v1.5.3/apis/rss.py#L185-L198
github.com
https://github.com/rachelos/we-mp-rss/blob/v1.5.3/core/lax/template_parser.py#L1150-L1166
hackmd.io
https://hackmd.io/@hieuPenguinnn/werss-rss-template-unauth-ssti-rce
www.vulncheck.com
https://www.vulncheck.com/advisories/werss-we-mp-rss-through-1.5.3-rce-via-template-parameter-in-rss-endpoint
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