CVE-2026-21631
Joomla! Core - [20260303] - XSS vector in com_associations comparison view
Lack of output escaping leads to a XSS vector in the multilingual associations component.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- High
- User interaction
- Passive
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
Joomla! Core - [20260303] - XSS vector in com_associations comparison view
Lack of output escaping leads to a XSS vector in the multilingual associations component.
- Record
CVE-2026-21631- CVSS 4.0
- 5.9 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:U - Weakness
- CWE-79
- Updated
- 2026-11-02
EUVDEUVD-2026-17857
Lack of output escaping leads to a XSS vector in the multilingual associations component.
- Record
EUVD-2026-17857- CVSS 4.0
- 5.9 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:U - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-24p2-2h4q-gmhf
Lack of output escaping leads to a XSS vector in the multilingual associations component.
Lack of output escaping leads to a XSS vector in the multilingual associations component.
- Record
GHSA-24p2-2h4q-gmhf- CVSS 4.0
- 5.9 Medium
CVSS:4.0/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 - CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
NVD
Lack of output escaping leads to a XSS vector in the multilingual associations component.
- Record
CVE-2026-21631- CVSS 4.0
- 5.9 Medium
CVSS:4.0/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 - CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
OSV
Lack of output escaping leads to a XSS vector in the multilingual associations component.
- Record
CVE-2026-21631- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N - Updated
- 2026-11-02
OSVBIT-joomla-2026-21631 No score
Joomla! Core - [20260303] - XSS vector in com_associations comparison view
Lack of output escaping leads to a XSS vector in the multilingual associations component.
- Record
BIT-joomla-2026-21631- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
joomlaBitnami |
3.0.0 up to 5.4.4, 6.0.0 up to 6.0.4 | 5.4.46.0.4 |
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-2026-21631 is a medium vulnerability (CVSS 5.9) in Joomla Joomla\!, published April 1, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.22%, the 12th percentile. Fixed in joomla 5.4.4.