Administrator command execution via unsandboxed semantic templates
Published Sep 4, 2026 · Updated Sep 4, 2026
Stored SSTI in YesWiki Bazar before 4.6.6 allows remote authenticated users with administrator access to execute server commands. The semantic transformer passes administrator-controlled bn_sem_template content to TemplateEngine::renderFromStringNoEscape(), which renders it as a live, unsandboxed Twig template. Administrator access is required to store the payload, but a later request to a public semantic endpoint triggers persistent host command execution.
Summary
What happened
Stored SSTI in YesWiki Bazar before 4.6.6 allows remote authenticated users with administrator access to execute server commands. The semantic transformer passes administrator-controlled bn_sem_template content to TemplateEngine::renderFromStringNoEscape(), which renders it as a live, unsandboxed Twig template. Administrator access is required to store the payload, but a later request to a public semantic endpoint triggers persistent host command execution.
The record
- CVE
- CVE-2026-52762
- Published
- Sep 4, 2026
- Updated
- Sep 4, 2026
- Vendor
- YesWiki
- Product
- YesWiki
- Classifications
- CWE-1336, T1059
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Sep 4, 2026CVE publishedPublication date reported by the CVE source.
- Sep 4, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 4.6.6
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Bazar semantic-template SSTI proof of conceptfunctional · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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