Vulnerability details

CVE-2026-111687

rachelos we-mp-rss

WeRSS (we-mp-rss) through 1.5.3 RCE via template Parameter in /rss Endpoint

CVSS 4.0

9.3Critical

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.

CVSS scores

Score	Version	Source	Vector
9.3Critical	4.0	CVEProject cvelistV5 (CNA) (VulnCheck)	`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`
9.8Critical	3.1	CVEProject cvelistV5 (CNA) (VulnCheck)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

Affected products

Vendor	Product	Versions	Source
rachelos	we-mp-rss	v ≤ 1.5.3	CVEProject cvelistV5 (CNA)

References and advisories

https://github.com/rachelos/we-mp-rss/blob/v1.5.3/core/lax/template_parser.py#L1150-L1166 technical-description
https://github.com/rachelos/we-mp-rss/blob/v1.5.3/apis/rss.py#L185-L198 technical-description
https://www.vulncheck.com/advisories/werss-we-mp-rss-through-1.5.3-rce-via-template-parameter-in-rss-endpoint third-party-advisory
https://hackmd.io/@hieuPenguinnn/werss-rss-template-unauth-ssti-rce third-party-advisory

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Details

Published: 2026-10-16
Last updated: 2026-10-16
State: Published
Assigner (CNA): VulnCheck
Kolun priority: 30 · Low

Exploit prediction (EPSS)

Probability of exploitation in 30 days

63%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: Proof of concept
Technical impact: Total

Weaknesses (CWE)

CWE-95
Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')