JCE fixes a critical actively exploited vulnerability

Do you think this report is well-written? *

Yes

Do you use this technology? *

Yes

Was this report useful to you?

Yes

We would be happy if you would describe:

The security services provided by CESNET are designed to provide significant support in ensuring the cybersecurity of connected organizations. Although we strive to provide quality and reliable services, it is not possible to guarantee absolute coverage of all security vulnerabilities. Our services should be seen as a complement to an organization's own security management, not as a replacement. The client bears ultimate responsibility for securing their environment.

This report was translated by AI; nobody has reviewed the translation yet. Original language: Czech.

[TLP:CLEAR] JCE fixes a critical actively exploited vulnerability

CISA has added the critical vulnerability (CVE-2026-48907) in Joomla Content Editor (JCE) to its catalog of actively exploited vulnerabilities [1]. A PoC script can be found at [2]. Products and their fixed versions: JCE - 2.9.99.5 - fixes CVE-2026-48907 [3] JCE - 2.9.99.6 - includes general codebase hardening [4] If you cannot update the JCE software module, it is recommended to uninstall it [3].

JCE - PHP code upload and execution (CVE-2026-48907)

CVSS 10.0 (Critical)

An unauthenticated remote attacker can create new editor profiles and achieve RCE [5].

The vulnerability is present in product:

JCE; <=2.9.99.4;

CVSS: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:A/AU:Y/U:Red

More information:

CVE-2026-48907 at cve.org, NVD
CWE-284: Improper Access Control at cwe.mitre.org

The vulnerability was publicly disclosed 5. 6. 2026.

Links

By CESNET, z.s.p.o. Táňa Macháčková on 17. 6. 2026.

Report feedback

[TLP:CLEAR] JCE fixes a critical actively exploited vulnerability

JCE - PHP code upload and execution (CVE-2026-48907)

CVSS 10.0 (Critical)

Links