# K2 (com_k2) below 2.26 - CVE-2026-48940 to 48946 - Multiple RCE (unrestricted upload), Path Traversal, Stored XSS, Unauthenticated Folder Delete and Mass Assignment [Joomla Vulnerability Database](https://mysites.guru/vulnerabilities/)/CVE-2026-48940 CVE-2026-48940LowCVSS 3.4CVE published 25 June 2026Added to mySites.guru 1 January 2026 # K2 (com\_k2) below 2.26 - CVE-2026-48940 to 48946 - Multiple RCE (unrestricted upload), Path Traversal, Stored XSS, Unauthenticated Folder Delete and Mass Assignment K2 by JoomlaWorks before 2.26 is affected by a cluster of vulnerabilities disclosed July 2026 and all fixed in 2.26. CVE-2026-48945 and CVE-2026-48946: a privileged K2 author can achieve RCE by uploading a PHP file (via the article attachment path, or a zip/tar extracted under /media/k2/galleries where non-image files keep their extension) and executing it. CVE-2026-48944: path traversal in the attachment copy handler lets an author copy configuration.php or other server files into /media/k2/attachments and download them. CVE-2026-48941: an unauthenticated request to the item.checkin task with a crafted sigProFolder parameter deletes arbitrary folders under /media/k2/galleries. CVE-2026-48940 and CVE-2026-48942: stored XSS via the embedVideo field and the K2 user image field. CVE-2026-48943: mass assignment via plg\_user\_k2 lets a registered user write arbitrary values to their own #\_\_k2\_users row. Update K2 to 2.26 or later. Copy citation ## Is my site affected? - **Affected** - K2 before 2.26 - **Fixed in** - 2.26 - **What to do** - Update K2 to 2.26 or later. [Check whether your sites are affected](https://mysites.guru/free-audit/) ## How CVE-2026-48940 is scored The base metrics as CISA-ADP published them, and what each one means for a site running an affected version. Threat and environmental metrics are left out: they describe a moment or a particular install rather than the flaw. 3.4 Low CVSS 3.1, scored by CISA-ADP `CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:N/A:N` ### How it is reached - **AV:N Attack vector** - Network. Reachable across the internet - **AC:L Attack complexity** - Low. Nothing to work around, it just works - **PR:H Privileges required** - High. Needs an account with elevated rights - **UI:R User interaction** - Required. Someone has to click or visit something - **S:C Scope** - Changed. The flaw reaches past the extension it is in ### What it does - **C:L Confidentiality** - Low. Some data can be read - **I:N Integrity** - None. Nothing can be altered - **A:N Availability** - None. The site stays up mySites.guru rates this Critical. Where our assessment and the published record differ, your sites are checked against ours. ## Timeline 1. 1 January 2026mySites.guru check added for K2 (before 2.26) 2. 25 June 2026CVE-2026-48940 record published by its CNA ## Rule details Critical[CVE-2026-48940](https://mysites.guru/vulnerabilities/CVE-2026-48940/)2026-01-01 [K2](https://mysites.guru/vulnerabilities/k2/) Affected versions: < 2.26 Full advisory: [cve.threatint.eu](https://cve.threatint.eu/CVE/CVE-2026-48946) ## Other vulnerabilities in K2 Updating for CVE-2026-48940 alone can leave a site on a release another rule still matches. These are the other flaws we check for in the same extension. ### [K2](https://mysites.guru/vulnerabilities/k2/) - [CVE-2026-48941](https://mysites.guru/vulnerabilities/CVE-2026-48941/) Medium, from 1.0 up to and including 2.26 - [CVE-2026-48942](https://mysites.guru/vulnerabilities/CVE-2026-48942/) Medium, from 1.0 up to and including 2.26 - [CVE-2026-48943](https://mysites.guru/vulnerabilities/CVE-2026-48943/) Medium, from 1.0 up to and including 2.26 - [CVE-2026-48944](https://mysites.guru/vulnerabilities/CVE-2026-48944/) Medium, from 1.0 up to and including 2.26 - [CVE-2026-48945](https://mysites.guru/vulnerabilities/CVE-2026-48945/) Medium, from 1.0 up to and including 2.26 - [CVE-2026-48946](https://mysites.guru/vulnerabilities/CVE-2026-48946/) Medium, from 1.0 up to and including 2.26 ## References - [CVE-2026-48940 on cve.org (the official CVE record)](https://www.cve.org/CVERecord?id=CVE-2026-48940) - [CVE-2026-48940 in the NIST National Vulnerability Database](https://nvd.nist.gov/vuln/detail/CVE-2026-48940) - [cve.threatint.eu/CVE/CVE-2026-48946](https://cve.threatint.eu/CVE/CVE-2026-48946) ## CVE-2026-48940 questions Show all Which versions are affected by CVE-2026-48940? [CVE-2026-48940](https://mysites.guru/vulnerabilities/CVE-2026-48940/) affects K2 before 2.26. The fix is in 2.26. How do I fix CVE-2026-48940? Update K2 to 2.26 or later. Then confirm the installed version on the Joomla administrator's Extensions: Manage screen. How severe is CVE-2026-48940? CISA-ADP scores it 3.4 (Low) under CVSS 3.1. In plain terms: reachable across the internet, needs an account with elevated rights and someone has to click or visit something. ## Running an affected version on a site you manage? A free audit tells you which of your Joomla and WordPress sites run an affected version, which are out of date, and which have not been backed up. No card required. If a site is already compromised, [fix.mysites.guru](https://fix.mysites.guru/) is a single fixed fee per incident, usually resolved the same day. This check is part of the [mySites.guru Joomla vulnerability scanner](https://mysites.guru/joomla-vulnerability-scanner/), which reads every installed extension's version on each audit. Browse the rest of the [Joomla vulnerability database](https://mysites.guru/vulnerabilities/). Rules current as of 14 October 2026.