CVE-2026-72702Public exploitNetwork attack vector

Origin validation bypass via unanchored Referer prefix

Published Aug 25, 2026 · Updated Aug 28, 2026

Origin validation error in GetGrav Grav before 2.0.16 allows remote attackers to bypass same-origin checks via crafted Referer headers. Uri::referrer() and Pages::referrerRoute() compare the attacker-controlled header with the bare site origin using an unanchored string prefix. Exploitation requires a victim to follow or load a cross-site request from an attacker-controlled lookalike domain; the confirmed consequence is acceptance of an off-site Referer and derivation of an attacker-influenced route.

CVSS severity9.3
Critical
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Origin validation error in GetGrav Grav before 2.0.16 allows remote attackers to bypass same-origin checks via crafted Referer headers. Uri::referrer() and Pages::referrerRoute() compare the attacker-controlled header with the bare site origin using an unanchored string prefix. Exploitation requires a victim to follow or load a cross-site request from an attacker-controlled lookalike domain; the confirmed consequence is acceptance of an off-site Referer and derivation of an attacker-influenced route.

The record

CVE
CVE-2026-72702
Published
Aug 25, 2026
Updated
Aug 28, 2026
Vendor
GetGrav
Product
Grav
Classifications
CWE-346
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 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 <2.0.16

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

GetGrav · Gravversion=0 <2.0.16

Published CVSS scores

5.4VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-346Origin Validation Error

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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