Server-side Request Forgery (SSRF) Affecting yeswiki/yeswiki package, versions <4.7.0
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-PHP-YESWIKIYESWIKI-21717105
- published26 Oct 2026
- disclosed25 Oct 2026
- creditDystopian M
Introduced: 25 Oct 2026
NewCVE-2026-116205 (opens in a new tab)How to fix?
Upgrade yeswiki/yeswiki to version 4.7.0 or higher.
Overview
Affected versions of this package are vulnerable to Server-side Request Forgery (SSRF) via formatters/raw.php, which fetches a user-supplied URL using file() without validating the target host. An unauthenticated attacker can supply an internal URL as the raw inclusion target, causing the server to issue an HTTP request to an arbitrary internal host and reflect the response body back to the attacker, enabling full read-back SSRF against services unreachable from the client.
PoC
Default installation, no configuration changes. Stand up any HTTP service on an internal host the client cannot reach directly (models an internal service), then send — with no cookie or authentication:
GET /?wiki=PagePrincipale/render&content=[[|http://INTERNAL_HOST:PORT/x]]
- The YesWiki server issues
GET /x/wakka.php?wiki=404/rawtoINTERNAL_HOST:PORT(visible in the target's access log, sourced from the YesWiki container). INTERNAL_HOST's response body is reflected back in the HTTP response — full read-back SSRF. Blind reachability confirmed against arbitrary host:port.
Note: Default installation with no configuration changes, targeting an internal HTTP service unreachable by the client.