CVE-2026-34213
Docmost has cross-page attachment overwrite via flawed attachmentId overwrite validation
Description
Docmost is open-source collaborative wiki and documentation software. Starting in version 0.3.0 and prior to version 0.71.0, improper authorization in Docmost allows a low-privileged authenticated user to overwrite another page's attachment within the same workspace by supplying a victim `attachmentId` to `POST /api/files/upload`. This is a remote integrity issue requiring no victim interaction. Version 0.71.0 contains a patch.
INFO
Published Date :
April 14, 2026, 10:16 p.m.
Last Modified :
July 24, 2026, 10:10 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 | [email protected] | ||||
| CVSS 3.1 | MEDIUM | MITRE-CVE |
Solution
- Update Docmost to version 0.71.0 or later.
- Ensure proper authorization checks are implemented.
Public PoC/Exploit Available at Github
CVE-2026-34213 has a 2 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
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-2026-34213.
| URL | Resource |
|---|---|
| https://github.com/docmost/docmost/security/advisories/GHSA-89fp-2hch-j9gp | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-34213 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-2026-34213
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).
A low-privileged Docmost user could supply a victim attachmentId to the generic upload endpoint and overwrite another page's stored attachment inside the same workspace.
📡 PoC auto collect from GitHub. ⚠️ Be careful Malware.
security cve exploit poc vulnerability
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-34213 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-34213 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]
Jul. 24, 2026
Action Type Old Value New Value Added Translation Title: Docmost, Description: Docmost es un software de wiki y documentación colaborativo de código abierto. A partir de la versión 0.3.0 y antes de la versión 0.71.0, una autorización indebida en Docmost permite a un usuario autenticado con bajos privilegios sobrescribir el adjunto de otra página dentro del mismo espacio de trabajo proporcionando un 'attachmentId' de la víctima a 'POST /API/files/upload'. Este es un problema de integridad remota que no requiere interacción de la víctima. La versión 0.71.0 contiene un parche. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'docmost', 'product': 'docmost', 'versions': [{'status': 'affected', 'version': '>= 0.3.0, < 0.71.0'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-34213', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-04-15T13:31:11.461730Z'} -
Initial Analysis by [email protected]
Apr. 22, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:docmost:docmost:*:*:*:*:*:*:*:* versions from (including) 0.3.0 up to (excluding) 0.71.0 Added Reference Type GitHub, Inc.: https://github.com/docmost/docmost/security/advisories/GHSA-89fp-2hch-j9gp Types: Vendor Advisory -
New CVE Received by [email protected]
Apr. 14, 2026
Action Type Old Value New Value Added Description Docmost is open-source collaborative wiki and documentation software. Starting in version 0.3.0 and prior to version 0.71.0, improper authorization in Docmost allows a low-privileged authenticated user to overwrite another page's attachment within the same workspace by supplying a victim `attachmentId` to `POST /api/files/upload`. This is a remote integrity issue requiring no victim interaction. Version 0.71.0 contains a patch. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L Added CWE CWE-639 Added Reference https://github.com/docmost/docmost/security/advisories/GHSA-89fp-2hch-j9gp