CVE-2026-85601Public exploitNetwork attack vectorHinoki check available

Admin-session code execution via unsanitized Markdown HTML

Published Sep 4, 2026 · Updated Sep 4, 2026

Stored cross-site scripting in Grav Admin before 2.0.20 allows remote attackers to execute code in authenticated admin sessions. MarkdownEditor and MarkdownModal pass marked.parse() output directly to Svelte's {@html} directive, leaving javascript: link schemes unsanitized. Exploitation requires an administrator to open a crafted plugin or theme changelog and activate its link, enabling actions in that admin context.

CVSS severity5.1
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Stored cross-site scripting in Grav Admin before 2.0.20 allows remote attackers to execute code in authenticated admin sessions. MarkdownEditor and MarkdownModal pass marked.parse() output directly to Svelte's {@html} directive, leaving javascript: link schemes unsanitized. Exploitation requires an administrator to open a crafted plugin or theme changelog and activate its link, enabling actions in that admin context.

The record

CVE
CVE-2026-85601
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
Grav
Product
Grav
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2.0.20

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Grav · Gravversion=0 <2.0.20

Published CVSS scores

5.4VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001User Execution: Malicious Link

Public exploit references

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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