CVE-2026-72696
Grav CMS before 2.0.16 Symlink Following via createLockFile
Description
Grav CMS before 2.0.16 contains a symlink following vulnerability in Scheduler Job::createLockFile() that allows local attackers to overwrite arbitrary files by pre-creating symlinks at predictable lock file paths in the world-writable temp directory. Attackers can place a symlink at the predictable lock path pointing to any file the web server process can write to, and the next scheduled job run will follow the symlink and overwrite the target file's content with the job ID string.
INFO
Published Date :
Aug. 25, 2026, 2:16 a.m.
Last Modified :
Oct. 12, 2026, 3:10 p.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | MITRE-CVE | ||||
| CVSS 4.0 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update Grav CMS to version 2.0.16 or later.
- Verify lock file creation logic in Scheduler.
- Ensure predictable temporary file paths are secured.
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-2026-72696.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-72696 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-2026-72696
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-2026-72696 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-72696 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 vulnerabilidad de seguimiento de enlaces simbólicos en Scheduler Job::createLockFile() que permite a atacantes locales sobrescribir archivos arbitrarios mediante la creación previa de enlaces simbólicos en rutas de archivos de bloqueo predecibles en el directorio temporal con permisos de escritura para todos. Los atacantes pueden colocar un enlace simbólico en la ruta de bloqueo predecible que apunte a cualquier archivo en el que el proceso del servidor web pueda escribir, y la siguiente ejecución de trabajo programado seguirá el enlace simbólico y sobrescribirá el contenido del archivo de destino con la cadena de ID del trabajo. -
CVE Modified by [email protected]
Aug. 27, 2026
Action Type Old Value New Value Added Reference https://github.com/getgrav/grav/security/advisories/GHSA-q8w8-6cq5-j4h2 Added Reference https://www.vulncheck.com/advisories/grav-cms-before-symlink-following-via-createlockfile Removed Reference https://github.com/getgrav/grav/security/advisories/GHSA-q8w8-6cq5-j4h2 Removed Reference https://www.vulncheck.com/advisories/grav-cms-before-symlink-following-via-createlockfile -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 27, 2026
Action Type Old Value New Value Added Reference https://github.com/getgrav/grav/security/advisories/GHSA-q8w8-6cq5-j4h2 Added SSVC {'id': 'CVE-2026-72696', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-27T14:51:36.772362Z'} -
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 a symlink following vulnerability in Scheduler Job::createLockFile() that allows local attackers to overwrite arbitrary files by pre-creating symlinks at predictable lock file paths in the world-writable temp directory. Attackers can place a symlink at the predictable lock path pointing to any file the web server process can write to, and the next scheduled job run will follow the symlink and overwrite the target file's content with the job ID string. Added CVSS V4.0 AV:L/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:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-59 Added Reference https://github.com/getgrav/grav/security/advisories/GHSA-q8w8-6cq5-j4h2 Added Reference https://www.vulncheck.com/advisories/grav-cms-before-symlink-following-via-createlockfile