ExternalGuidance Extension up to 1.38 on Mediawiki cross site scripting

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.
4.1	$0-$5k	0.00

Summaryinfo

A vulnerability was found in ExternalGuidance Extension up to 1.38 on Mediawiki. It has been classified as problematic. This affects an unknown part. This manipulation causes cross site scripting. The identification of this vulnerability is CVE-2025-62698. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in ExternalGuidance Extension up to 1.38 on Mediawiki and classified as problematic. Affected by this vulnerability is an unknown code block. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in The Wikimedia Foundation Mediawiki - ExternalGuidance allows Stored XSS.This issue affects Mediawiki - ExternalGuidance: from master before 1.39.

The weakness was shared by SomeRandomDeveloper. The advisory is shared at gerrit.wikimedia.org. This vulnerability is known as CVE-2025-62698 since 10/20/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 271639 (Linux Distros Unpatched Vulnerability : CVE-2025-62698), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.39 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (271639). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

• ExternalGuidance Extension

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20
• 1.21
• 1.22
• 1.23
• 1.24
• 1.25
• 1.26
• 1.27
• 1.28
• 1.29
• 1.30
• 1.31
• 1.32
• 1.33
• 1.34
• 1.35
• 1.36
• 1.37
• 1.38

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: 4.3
VulDB Meta Temp Score: 4.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Cross site scripting
CWE: CWE-79 / CWE-94 / CWE-74
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

Nessus ID: 271639
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-62698

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: ExternalGuidance Extension 1.39

Timelineinfo

10/20/2025 Advisory disclosed
10/20/2025 +0 days CVE reserved
10/20/2025 +0 days VulDB entry created
10/28/2025 +8 days VulDB entry last update

Sourcesinfo

Advisory: gerrit.wikimedia.org
Researcher: SomeRandomDeveloper
Status: Confirmed

CVE: CVE-2025-62698 (🔒)
GCVE (CVE): GCVE-0-2025-62698
GCVE (VulDB): GCVE-100-329089

Entryinfo

Created: 10/20/2025 22:28
Updated: 10/28/2025 08:35
Changes: 10/20/2025 22:28 (67), 10/28/2025 08:35 (2)
Complete: 🔍
Cache ID: 216::103

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

Discussion

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