AjaXplorer < 2.6 checkInstall.php Unauthenticated RCE
An unauthenticated remote command execution vulnerability exists in AjaXplorer (now known as Pydio Cells) versions prior to 2.6. The flaw resides in the checkInstall.php script within the access.ssh plugin, which fails to properly sanitize user-supplied input to the destServer GET parameter. By injecting shell metacharacters, remote attackers can execute arbitrary system commands on the server with the privileges of the web server process.
- Published
- Aug 8, 2025
- Updated
- Jun 16, 2026
- EPSS
- 1.7% · 76th percentile
- CWE
- CWE-78
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Report tools
Action score
38
Monitor
Low priority for now.
- CVSS
- 37 / 40 · 9.3 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 1.7%
CISA SSVC decision
- Exploitation
- proof of concept
- Automatable
- yes
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · VulnCheck
- 9.3
- NVD has not scored this yet; the score shown is the CNA’s.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
—
Versions reported by the vendor
Affected version ranges reported by the assigning authority (VulnCheck). Independent of NVD's CPE analysis and usually ahead of it.
AjaXplorer AjaXplorer
- before 2.6affected
Same product
ajaxplorer: all recordsOther highest-scoring records for the same primary product.
- CVE-2013-6226Directory traversal vulnerability in plugins/editor.zoho/agent/save_zoho.php in the Zoho plugin in Pydio (formerly AjaXplorer) before 5.0.4 35Monitor
- CVE-2013-6227Unrestricted file upload vulnerability in plugins/editor.zoho/agent/save_zoho.php in the Zoho plugin in Pydio (formerly AjaXplorer) before 532Monitor
- CVE-2012-1840AjaXplorer 3.2.x before 3.2.5 and 4.0.x before 4.0.4 does not properly perform cookie authentication, which allows remote attackers to obtai31Monitor
- CVE-2012-1839Multiple directory traversal vulnerabilities in the Get Template feature in plugins/gui.ajax/class.AJXP_ClientDriver.php in AjaXplorer 3.2.x31Monitor
- CVE-2008-6639Cross-site request forgery (CSRF) vulnerability in admin.php in AjaXplorer 2.3.3 and 2.3.4 allows remote attackers to hijack the authenticat27Monitor
- CVE-2013-5688Multiple directory traversal vulnerabilities in index.php in AjaXplorer 5.0.2 and earlier allow remote authenticated users to read arbitrary24Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
No fix version is recorded for this entry. Check the references for vendor advisories.
Exploit status
Weaponized
A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.
Evidence
- Metasploit module ×1
Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.
| Source | Kind | Date |
|---|---|---|
| Metasploit module | exploit/multi/http/ajaxplorer_checkinstall_execAjaXplorer checkInstall.php Remote Command Executionexploit | 2010-04-04 |
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
- Metasploit-5606 d
- Published
- TodaySep 30, 2026+418 d
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
- Julien Cayssolfinder
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
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Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- Integrity
- Availability
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- X
Weakness class (CWE)
CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
nvd-secondary
Root cause
User input is inserted as text into a shell command. The shell may interpret special characters in the input as part of the command.
The bug in code
The whole CWE-78 classA representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.
Vulnerable
const host = req.body.host;exec("ping -c 1 " + host, onResult);Fixed
const host = req.body.host;if (!/^[a-z0-9.-]{1,253}$/i.test(host)) return res.sendStatus(400);execFile("ping", ["-c", "1", host], onResult);Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Command Line Execution through SQL InjectionCAPEC-108likelihood: Low · Very High
- Command DelimitersCAPEC-15likelihood: High · High
- Exploiting Multiple Input Interpretation LayersCAPEC-43likelihood: Medium · High
- Argument InjectionCAPEC-6likelihood: High · High
- OS Command InjectionCAPEC-88likelihood: High · High
ATT&CK techniques
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Change log
No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.
References
- www.tenable.com/plugins/nessus/45489
- raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/multi/http/ajaxplorer_checkinstall_exec.rb
- sourceforge.net/projects/ajaxplorer/
- www.exploit-db.com/exploits/21993
- www.vulncheck.com/advisories/ajaxplorer-unauth-rce
Vendor advisories and official records. Exploit/PoC links are deliberately left out.