CVE-2026-86197Public exploitNetwork attack vector

Page-editor-to-super-admin escalation via unescaped asset tags

Published Sep 5, 2026 · Updated Sep 10, 2026

Stored cross-site scripting in GetGrav Grav before 2.0.20 allows remote authenticated users to execute script in visitors' browsers. The Twig content sandbox allowlists Assets.addJs and addCss, which store editor-controlled URLs and attributes that tag renderers concatenate without HTML escaping. Ordinary page-edit rights on a stock install are sufficient; an administrator viewing or previewing the page executes the payload on the site's origin, exposing same-origin administrator tokens.

CVSS severity5.1
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in GetGrav Grav before 2.0.20 allows remote authenticated users to execute script in visitors' browsers. The Twig content sandbox allowlists Assets.addJs and addCss, which store editor-controlled URLs and attributes that tag renderers concatenate without HTML escaping. Ordinary page-edit rights on a stock install are sufficient; an administrator viewing or previewing the page executes the payload on the site's origin, exposing same-origin administrator tokens.

The record

CVE
CVE-2026-86197
Published
Sep 5, 2026
Updated
Sep 10, 2026
Vendor
GetGrav
Product
Grav
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 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=0 <2.0.20

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GetGrav · Gravversion=0 <2.0.20

Published CVSS scores

5.1VulnCheck CNACVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/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 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')
T1189Drive-by Compromise

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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