Affected versions: < 6.2.7
Full advisory: www.cve.org
CVE-2026-88857CriticalCVSS 9.4Published 20 September 2026
OS Gallery (com_osgallery) below 6.2.7 - Authenticated, Privileged Remote Code Execution and SQL Injection (3 CVEs)
OrdaSoft's OS Gallery component before 6.2.7 has three flaws exploitable by an authenticated user holding the core.manage permission on the gallery component (not administrator-wide trust). CVE-2026-88857 (CVSS 9.4): saveWatermark() writes an uploaded file to a web-accessible path using the client-supplied filename with no extension or content check, so a .php file disguised with an image Content-Type can be uploaded and executed directly. CVE-2026-88856 (CVSS 9.4): updateOSGallery(), reached via task=update_osgallery, passes a JSON request's method field to a live PHP function call using the package field as its argument, with no allow-list, reaching functions such as system, exec, shell_exec and passthru directly. CVE-2026-88855 (CVSS 8.6): saveGallery() concatenates category_names[], catOrderIds and image-ordering values into SQL with no quoting or integer cast, giving full read/write database access including UNION extraction of #__users password hashes. Update to 6.2.7 or later.
Affected versions: < 6.2.7
Official record: cve.org · NVD
Every connected Joomla site is checked against this rule on each audit, and flagged if it runs an affected version.
How CVE-2026-88857 is scored
The base metrics as Joomla CNA 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.
9.4 Critical
CVSS 4.0, scored by Joomla CNACVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:HHow it is reached
- AV:N Attack vector
- Network. Reachable across the internet
- AC:L Attack complexity
- Low. Nothing to work around, it just works
- AT:N Attack requirements
- None. Works against any affected install
- PR:H Privileges required
- High. Needs an account with elevated rights
- UI:N User interaction
- None. Nobody has to be tricked into anything
What it does to the site
- VC:H Confidentiality
- High. Everything the site holds can be read
- VI:H Integrity
- High. Data and files can be altered at will
- VA:H Availability
- High. The site can be taken down
What it does beyond the site
- SC:H Confidentiality
- High. Data on other systems can be read
- SI:H Integrity
- High. Other systems can be altered
- SA:H Availability
- High. Other systems can be taken down
Affected extensions and versions
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 is a single fixed fee per incident, usually resolved the same day.
Rules current as of 21 September 2026.