Stored XSS via unescaped shortcode parameters
Published Sep 4, 2026 · Updated Sep 4, 2026
Stored XSS in Grav Shortcode Core 6.2.4 and earlier allows remote authenticated users to run JavaScript via crafted shortcode parameters. LoremShortcode passes the unvalidated tag value to an HTML wrapper formatter, while DetailsShortcode concatenates the unescaped summary value inside a summary element. Ordinary page-edit access is required; stored payloads execute for every visitor, including administrators, and can act through an administrator's session.
Summary
What happened
Stored XSS in Grav Shortcode Core 6.2.4 and earlier allows remote authenticated users to run JavaScript via crafted shortcode parameters. LoremShortcode passes the unvalidated tag value to an HTML wrapper formatter, while DetailsShortcode concatenates the unescaped summary value inside a summary element. Ordinary page-edit access is required; stored payloads execute for every visitor, including administrators, and can act through an administrator's session.
The record
- CVE
- CVE-2026-85599
- Published
- Sep 4, 2026
- Updated
- Sep 4, 2026
- Vendor
- Grav
- Product
- Grav
- Classifications
- CWE-79, T1059.007
- Attack vector
- network
- Privileges
- authenticated
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=0 <6.2.5
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
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
- Vendor advisory shortcode 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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