chatchat-space Langchain-Chatchat up to 0.3.1 Backend upload_temp_docs flag path traversal

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.3$0-$5k0.68

Summaryinfo

A vulnerability marked as critical has been reported in chatchat-space Langchain-Chatchat up to 0.3.1. Affected by this vulnerability is the function upload_temp_docs of the file /knowledge_base/upload_temp_docs of the component Backend. Performing a manipulation of the argument flag results in path traversal. This vulnerability is known as CVE-2025-6853. Remote exploitation of the attack is possible. Furthermore, an exploit is available.

Detailsinfo

A vulnerability classified as critical has been found in chatchat-space Langchain-Chatchat up to 0.3.1. This affects the function upload_temp_docs of the file /knowledge_base/upload_temp_docs of the component Backend. The manipulation of the argument flag with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality, integrity, and availability.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2025-6853. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details and a public exploit are known. MITRE ATT&CK project uses the attack technique T1006 for this issue.

The exploit is shared for download at github.com. It is declared as proof-of-concept.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-19477). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.3

VulDB Base Score: 6.3
VulDB Temp Score: 5.7
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔒

CNA Base Score: 6.3
CNA Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Path traversal
CWE: CWE-22
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

06/28/2025 Advisory disclosed
06/28/2025 +0 days VulDB entry created
09/16/2025 +80 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: 5352
Status: Not defined

CVE: CVE-2025-6853 (🔒)
GCVE (CVE): GCVE-0-2025-6853
GCVE (VulDB): GCVE-100-314325
EUVD: 🔒
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 06/28/2025 12:43
Updated: 09/16/2025 22:57
Changes: 06/28/2025 12:43 (59), 06/29/2025 10:44 (30), 06/29/2025 11:16 (1), 09/16/2025 22:57 (12)
Complete: 🔍
Cache ID: 216:3C9:103

Submitinfo

Accepted

  • Submit #601155: chatchat-space Langchain-Chatchat < v0.3.1 Path Traversal: '.../...//' (by github.com)

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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