CVE-2026-72702
Grav CMS before 2.0.16 Origin Validation Bypass via Referer
Description
Grav CMS before 2.0.16 contains an origin validation bypass in the Uri::referrer() and Pages::referrerRoute() methods, which validate the Referer header using an unanchored string prefix match (str_starts_with($referrer, $base)) with no trailing delimiter. An attacker who controls a domain that begins with the victim site's origin (e.g. https://example.com.attacker.tld) can send a request with such a Referer to be treated as same-origin, bypassing the Referer-based origin check.
INFO
Published Date :
Aug. 25, 2026, 2:16 a.m.
Last Modified :
Oct. 12, 2026, 3:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | MITRE-CVE | ||||
| CVSS 4.0 | CRITICAL | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | CRITICAL | [email protected] |
Solution
- Update Grav CMS to version 2.0.16.
- Apply vendor patches for the Uri::referrer() method.
- Ensure proper origin validation is implemented.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-72702.
| URL | Resource |
|---|---|
| https://github.com/getgrav/grav/security/advisories/GHSA-9ccq-2jfg-qw33 | |
| https://www.vulncheck.com/advisories/grav-cms-before-origin-validation-bypass-via-referer |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-72702 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-72702
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-72702 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-72702 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Oct. 12, 2026
Action Type Old Value New Value Added Translation Title: Grav de getgrav, Description: Grav CMS anterior a la versión 2.0.16 contiene una omisión de validación de origen en los métodos Uri::referrer() y Pages::referrerRoute(), que validan el encabezado Referer utilizando una coincidencia de prefijo de cadena no anclada (str_starts_with($referrer, $base)) sin delimitador final. Un atacante que controla un dominio que comienza con el origen del sitio de la víctima (p. ej., HTTPS://example.com.attacker.tld) puede enviar una solicitud con dicho Referer para que sea tratado como del mismo origen, omitiendo la verificación de origen basada en Referer. -
CVE Modified by [email protected]
Oct. 08, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/72xxx/CVE-2026-72702.json">CVE-2026-72702</a> -
CVE Modified by [email protected]
Aug. 28, 2026
Action Type Old Value New Value Added Reference https://github.com/getgrav/grav/security/advisories/GHSA-9ccq-2jfg-qw33 Added Reference https://www.vulncheck.com/advisories/grav-cms-before-origin-validation-bypass-via-referer Removed Reference https://github.com/getgrav/grav/security/advisories/GHSA-9ccq-2jfg-qw33 Removed Reference https://www.vulncheck.com/advisories/grav-cms-before-origin-validation-bypass-via-referer -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 28, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-72702', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-25T16:02:36.978586Z'} -
New CVE Received by [email protected]
Aug. 25, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'getgrav', 'product': 'grav', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '2.0.16', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '2.0.16', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}] Added Description Grav CMS before 2.0.16 contains an origin validation bypass in the Uri::referrer() and Pages::referrerRoute() methods, which validate the Referer header using an unanchored string prefix match (str_starts_with($referrer, $base)) with no trailing delimiter. An attacker who controls a domain that begins with the victim site's origin (e.g. https://example.com.attacker.tld) can send a request with such a Referer to be treated as same-origin, bypassing the Referer-based origin check. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N Added CWE CWE-346 Added Reference https://github.com/getgrav/grav/security/advisories/GHSA-9ccq-2jfg-qw33 Added Reference https://www.vulncheck.com/advisories/grav-cms-before-origin-validation-bypass-via-referer