Session compromise via stored page-editor script injection
Published Jun 25, 2026 · Updated Jun 25, 2026
Stored XSS in Grav before 1.6.30 allows remote authenticated users with page-editing rights to run script in other users' sessions. The vendor advisory identifies the default Admin page-editor security configuration as the locus but does not disclose the exact field or encoding operation that accepts stored script. Exploitation requires page-editing privileges and a victim to render the payload; an administrator's session can then install a malicious plugin containing a web shell.
Summary
What happened
Stored XSS in Grav before 1.6.30 allows remote authenticated users with page-editing rights to run script in other users' sessions. The vendor advisory identifies the default Admin page-editor security configuration as the locus but does not disclose the exact field or encoding operation that accepts stored script. Exploitation requires page-editing privileges and a victim to render the payload; an administrator's session can then install a malicious plugin containing a web shell.
The record
- CVE
- CVE-2020-37256
- Published
- Jun 25, 2026
- Updated
- Jun 25, 2026
- Vendor
- Grav
- Product
- Grav
- Classifications
- CWE-79, T1059.007
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 25, 2026CVE publishedPublication date reported by the CVE source.
- Jun 25, 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=0 <1.6.30
What conditions does exploitation require?
What is affected?
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
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Technologies
Your stack
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Your stack
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