CVE-2026-111687

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.

References

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