VDB-315193 · CVE-2025-53532 · GHSA-w6vg-v24f-4vm3

giscus improper authorization

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.2	$0-$5k	0.00

Summaryinfo

A vulnerability marked as critical has been reported in giscus. Affected is an unknown function. This manipulation causes improper authorization. This vulnerability appears as CVE-2025-53532. The attack may be initiated remotely. There is no available exploit. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability has been found in giscus (the affected version is unknown) and classified as critical. Affected by this vulnerability is an unknown code. The manipulation with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

giscus is a commenting system powered by GitHub Discussions. A bug in giscus' discussions creation API allowed an unauthorized user to create discussions on any repository where giscus is installed. This affects the server-side part of giscus, which is provided via http://giscus.app or your own self-hosted service. This vulnerability is fixed by the c43af7806e65adfcf4d0feeebef76dc36c95cb9a and 4b9745fe1a326ce08d69f8a388331bc993d19389 commits.

The advisory is shared at github.com. This vulnerability is known as CVE-2025-53532 since 07/02/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1548.002 for this issue.

Applying the patch c43af7806e65adfcf4d0feeebef76dc36c95cb9a/4b9745fe1a326ce08d69f8a388331bc993d19389 is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-20284). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

giscus

License

open-source

Website

Product: https://github.com/giscus/giscus/

CPE 2.3info

🔒

CPE 2.2info

🔒

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.2

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.3
CNA Vector (GitHub_M): 🔒

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

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

Exploitinginfo

Class: Improper authorization
CWE: CWE-285 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: c43af7806e65adfcf4d0feeebef76dc36c95cb9a/4b9745fe1a326ce08d69f8a388331bc993d19389

Timelineinfo

07/02/2025 CVE reserved
07/07/2025 +5 days Advisory disclosed
07/07/2025 +0 days VulDB entry created
07/07/2025 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-w6vg-v24f-4vm3
Status: Confirmed

CVE: CVE-2025-53532 (🔒)
GCVE (CVE): GCVE-0-2025-53532
GCVE (VulDB): GCVE-100-315193
EUVD: 🔒

Entryinfo

Created: 07/07/2025 20:20
Updated: 07/07/2025 20:50
Changes: 07/07/2025 20:20 (63), 07/07/2025 20:50 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.