Stored XSS via omitted partial-validation safety check
Published Jun 18, 2026 · Updated Jun 18, 2026
Stored XSS in Grav API Plugin 1.0.0-rc.14 allows remote authenticated users to execute JavaScript in page visitors' browsers. PagesController::validateChangedFields() calls Validation::validate() but omits Validation::checkSafety() before saving attacker-controlled Markdown, which is later rendered without sanitization. Exploitation requires page-write permission and a visitor to open the saved page; the script runs in that visitor's Grav origin and can act with the visitor's session.
Summary
What happened
Stored XSS in Grav API Plugin 1.0.0-rc.14 allows remote authenticated users to execute JavaScript in page visitors' browsers. PagesController::validateChangedFields() calls Validation::validate() but omits Validation::checkSafety() before saving attacker-controlled Markdown, which is later rendered without sanitization. Exploitation requires page-write permission and a visitor to open the saved page; the script runs in that visitor's Grav origin and can act with the visitor's session.
The record
- CVE
- CVE-2026-11982
- Published
- Jun 18, 2026
- Updated
- Jun 18, 2026
- Vendor
- Grav
- Product
- Grav API Plugin
- Classifications
- CWE-79, T1059.007
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 18, 2026CVE publishedPublication date reported by the CVE source.
- Jun 18, 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?
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- Affected versionversion=1.7.52
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
- GHSA-5wc5-7v9g-f7v6 authenticated Pages API stored-XSS proof of conceptproof of concept · 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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