Security readout for executives and security teams
Plain-English summary
CVE-2026-57828 is a critical authenticated file-upload flaw in the Phoca Download Joomla extension. A registered user could upload executable files, potentially leading to full remote code execution. Organizations running affected versions should treat this as urgent, especially where public registration or broad user accounts are enabled.
Executive priority
Prioritize within the next maintenance window or faster for public Joomla sites. The vulnerability can turn a low-privilege account into full site compromise.
Technical view
The issue is CWE-434: unrestricted upload of dangerous file types. Sources state Phoca Download for Joomla versions 1.0 through 6.1.2 are affected, with the vulnerable condition allowing authenticated arbitrary executable upload and RCE. CVSS 4.0 score is 9.0, requiring low privileges and no user interaction.
Likely exposure
Internet-facing Joomla sites using Phoca Download versions 1.0-6.1.2 are most exposed. Risk is higher if untrusted users can register or have upload-capable accounts.
Exploitation context
The provided sources do not state active exploitation, and this CVE is not marked KEV. Exploitation requires an authenticated user account, but the impact is high because successful abuse may allow remote code execution.
Researcher notes
There is a naming inconsistency in the supplied title referencing RSFiles, while the description and affected product identify Phoca Download. Validate against the CVE record and vendor advisory before reporting exposure.
Mitigation direction
- Upgrade Phoca Download to version 6.1.3 or later if vendor guidance confirms availability.
- Restrict registration and upload permissions to trusted users only.
- Review vendor and advisory pages for any additional hardening guidance.
- Temporarily disable the extension if immediate upgrade is not possible.
Validation and detection
- Inventory Joomla sites for the Phoca Download extension.
- Confirm installed Phoca Download version is not 1.0 through 6.1.2.
- Review user roles allowed to upload files through the extension.
- Check web directories for unexpected executable files.
- Review web and Joomla logs for suspicious authenticated upload activity.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-434: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-57828 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H——JoomlaVulnerability scoring details
Base CVSS 4.0 score
9CriticalVector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
Source materials
- CVE List V5 sourceCVE List V5
- https://www.phoca.cz/phocadownloadCVE reference, Joomla · product
- https://mysites.guru/blog/phoca-download-authenticated-file-upload-rce/CVE reference, Joomla · third-party-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Unrestricted Upload of File with Dangerous Type
Unrestricted Upload of File with Dangerous Type represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.