CVE-2021-23129
[20210303] - Core - XSS within alert messages showed to users
An issue was discovered in Joomla! 2.5.0 through 3.9.24. Missing filtering of messages showed to users that could lead to xss issues.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
An issue was discovered in Joomla! 2.5.0 through 3.9.24. Missing filtering of messages showed to users that could lead to xss issues.
- Record
CVE-2021-23129- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:P/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
CVE List No score
[20210303] - Core - XSS within alert messages showed to users
An issue was discovered in Joomla! 2.5.0 through 3.9.24. Missing filtering of messages showed to users that could lead to xss issues.
- Record
CVE-2021-23129- Updated
- 2026-11-02
EUVDEUVD-2021-10247 No score
An issue was discovered in Joomla! 2.5.0 through 3.9.24. Missing filtering of messages showed to users that could lead to xss issues.
- Record
EUVD-2021-10247- Updated
- 2026-11-02
GitHub AdvisoriesGHSA-5qp6-q86g-pjq8 No score
An issue was discovered in Joomla! 2.5.0 through 3.9.24. Missing filtering of messages showed to...
An issue was discovered in Joomla! 2.5.0 through 3.9.24. Missing filtering of messages showed to users that could lead to xss issues.
- Record
GHSA-5qp6-q86g-pjq8- Weakness
- CWE-79
- Updated
- 2026-11-02
OSV
An issue was discovered in Joomla! 2.5.0 through 3.9.24. Missing filtering of messages showed to users that could lead to xss issues.
- Record
CVE-2021-23129- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Updated
- 2026-11-02
OSVBIT-joomla-2021-23129 No score
[20210303] - Core - XSS within alert messages showed to users
An issue was discovered in Joomla! 2.5.0 through 3.9.24. Missing filtering of messages showed to users that could lead to xss issues.
- Record
BIT-joomla-2021-23129- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
joomlaBitnami |
2.5.0 up to 3.9.25 | 3.9.25 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-23129 is a medium vulnerability (CVSS 6.1) in Joomla Joomla\!, published March 4, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.80%, the 56th percentile. Fixed in joomla 3.9.25.