CVE-2026-21631 — MEDIUM (5.4)

Q: What is CVE-2026-21631?

CVE-2026-21631 is a vulnerability with a CVSS score of 5.4 (MEDIUM). Lack of output escaping leads to a XSS vector in the multilingual associations component.

Q: How severe is CVE-2026-21631?

CVE-2026-21631 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-21631?

Check the references section above for vendor advisories and patch information. Affected products include: Joomla Joomla\!.

Vulnerability Description

Lack of output escaping leads to a XSS vector in the multilingual associations component.

CVSS Score

5.4

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality

LOW

Integrity

LOW

Availability

NONE

Affected Products

Vendor	Product	Versions
Joomla	Joomla\!	>= 3.0.0, < 5.4.4

Related Weaknesses (CWE)

CWE-79

References

https://developer.joomla.org/security-centre/1029-20260303-core-xss-vector-in-coVendor Advisory
https://github.com/Shirshaw64p/security-advisories/tree/main/CVE-2026-21631ExploitThird Party Advisory

FAQ

What is CVE-2026-21631?

CVE-2026-21631 is a vulnerability with a CVSS score of 5.4 (MEDIUM). Lack of output escaping leads to a XSS vector in the multilingual associations component.

How severe is CVE-2026-21631?

CVE-2026-21631 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-21631?

Check the references section above for vendor advisories and patch information. Affected products include: Joomla Joomla\!.