Summary
YesWiki: Authenticated (Admin) Server-Side Template Injection to Remote Code Execution via Bazar Semantic Templates
Impact
An authenticated administrator can inject arbitrary Twig expressions into Bazar semantic templates, and those expressions are executed server-side when public semantic endpoints are requested.
In the validated environment, this leads to confirmed Remote Code Execution. An attacker with administrator access can:
- execute arbitrary Twig expressions on the server
- store a persistent payload in form configuration
- have that payload triggered later by unauthenticated requests to public semantic endpoints
- execute operating-system commands on the host
- gain interactive shell access to the underlying server
- pivot from application-level administration to full server compromise
This breaks the expected trust boundary between application administration and host-level execution. In practical terms, YesWiki administrator privileges become sufficient to obtain command execution on the server in affected deployments.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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Frequently Asked Questions
- What is CVE-2026-52762? CVE-2026-52762 is a high-severity security vulnerability in yeswiki/yeswiki (composer), affecting versions < 4.6.6. It is fixed in 4.6.6.
- Which versions of yeswiki/yeswiki are affected by CVE-2026-52762? yeswiki/yeswiki (composer) versions < 4.6.6 is affected.
- Is there a fix for CVE-2026-52762? Yes. CVE-2026-52762 is fixed in 4.6.6. Upgrade to this version or later.
- Is CVE-2026-52762 exploitable, and should I be worried? Whether CVE-2026-52762 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2026-52762 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2026-52762? Upgrade
yeswiki/yeswikito 4.6.6 or later.