CVE-2026-42611Public exploitNetwork attack vector

Administrator session compromise via SVG filter bypass

Published May 11, 2026 · Updated May 11, 2026

Stored XSS in Grav before 2.0.0-beta.2 allows remote authenticated users with page-edit rights to execute script in an administrator's browser. Security::detectXss fails to reject unquoted event handlers, while the default dangerous-tag list omits SVG and related scripting-capable elements. Exploitation requires a page editor to store crafted content and a Super Admin to visit it, exposing the administrator session context and enabling further privileged actions.

CVSS severity8.9
High
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Grav before 2.0.0-beta.2 allows remote authenticated users with page-edit rights to execute script in an administrator's browser. Security::detectXss fails to reject unquoted event handlers, while the default dangerous-tag list omits SVG and related scripting-capable elements. Exploitation requires a page editor to store crafted content and a Super Admin to visit it, exposing the administrator session context and enabling further privileged actions.

The record

CVE
CVE-2026-42611
Published
May 11, 2026
Updated
May 11, 2026
Vendor
Grav
Product
Grav
Classifications
CWE-79, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 11, 2026CVE publishedPublication date reported by the CVE source.
  2. May 11, 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.

  1. Affected versionversion=< 2.0.0-beta.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Grav · Gravversion=< 2.0.0-beta.2

Published CVSS scores

8.9GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:H

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1190Exploit Public-Facing Application

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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