CVE-2026-48954
Joomla! Core - [20260708] - XSS through language overrides
Description
Improper validation leads to a generic XSS vector in the language override feature.
INFO
Published Date :
July 7, 2026, 7:16 p.m.
Last Modified :
July 9, 2026, 2:44 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 | [email protected] | ||||
| CVSS 4.0 | MEDIUM | 6ff30186-7fb7-4ad9-be33-533e7b05e586 | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Validate all language override inputs.
- Sanitize user-supplied data.
- Implement output encoding.
- Update the application.
Public PoC/Exploit Available at Github
CVE-2026-48954 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-2026-48954.
| URL | Resource |
|---|---|
| https://developer.joomla.org/security-centre/1062-20260708-core-xss-through-language-overrides.html | 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-2026-48954 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-2026-48954
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).
Joomla 3.x development continued to ensure code security and support modern PHP versions
cms content-management-system joomla joomla-3 mariadb mysql php joomla-3x
JavaScript PHP TSQL HTML CSS Less
Security Fixes for Joomla 3 as an installable package.
PHP
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-48954 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-48954 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.
-
Reanalysis by [email protected]
Jul. 09, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Removed CVSS V3.1 AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N -
Initial Analysis by [email protected]
Jul. 09, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N Added CPE Configuration OR *cpe:2.3:a:joomla:joomla!:*:*:*:*:*:*:*:* versions from (including) 6.0.0 up to (excluding) 6.1.2 *cpe:2.3:a:joomla:joomla!:*:*:*:*:*:*:*:* versions from (including) 3.0.0 up to (excluding) 5.4.7 Added Reference Type Joomla! Project: https://developer.joomla.org/security-centre/1062-20260708-core-xss-through-language-overrides.html Types: Vendor Advisory -
New CVE Received by [email protected]
Jul. 07, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Joomla! Project', 'product': 'Joomla! CMS', 'versions': [{'status': 'affected', 'version': '3.0.0-5.4.6'}, {'status': 'affected', 'version': '6.0.0-6.1.1'}], 'defaultStatus': 'unaffected'}] Added Description Improper validation leads to a generic XSS vector in the language override feature. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:U/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 CWE CWE-79 Added Reference https://developer.joomla.org/security-centre/1062-20260708-core-xss-through-language-overrides.html -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 07, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-48954', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-07-07T18:43:24.410096Z'}