Common Weakness Enumeration

CWE-22

Allowed-with-Review

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Abstraction: Base · Status: Stable

The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

13047 vulnerabilities reference this CWE, most recent first.

CVE-2026-25951 (GCVE-0-2026-25951)

Vulnerability from cvelistv5 – Published: 2026-02-09 22:24 – Updated: 2026-02-11 21:24

Title

FUXA has a Path Traversal Sanitization Bypass

Summary

FUXA is a web-based Process Visualization (SCADA/HMI/Dashboard) software. Prior to 1.2.11, there is a flaw in the path sanitization logic allows an authenticated attacker with administrative privileges to bypass directory traversal protections. By using nested traversal sequences (e.g., ....//), an attacker can write arbitrary files to the server filesystem, including sensitive directories like runtime/scripts. This leads to Remote Code Execution (RCE) when the server reloads the malicious scripts. This vulnerability is fixed in 1.2.11.

Severity

8.6 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-23 - Relative Path Traversal
CWE-184 - Incomplete List of Disallowed Inputs

Assigner

GitHub_M

References

3 references

URL	Tags
https://github.com/frangoteam/FUXA/security/advis…	x_refsource_CONFIRM
https://github.com/frangoteam/FUXA/commit/f7a9f04…	x_refsource_MISC
https://github.com/frangoteam/FUXA/releases/tag/v1.2.11	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
frangoteam	FUXA	Affected: < 1.2.11

Show details on NVD website

JSON

To clipboard

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CVE-2026-25928 (GCVE-0-2026-25928)

Vulnerability from cvelistv5 – Published: 2026-03-19 19:27 – Updated: 2026-03-21 03:35

Title

OpenEMR Vulnerable to Path Traversal When Zipping DICOM Folders

Summary

OpenEMR is a free and open source electronic health records and medical practice management application. Prior to 8.0.0.2, the DICOM zip/export feature uses a user-supplied destination or path component when creating the zip file, without sanitizing path traversal sequences (e.g. `../`). An attacker with DICOM upload/export permission can write files outside the intended directory, potentially under the web root, leading to arbitrary file write and possibly remote code execution if PHP or other executable files can be written. Version 8.0.0.2 fixes the issue.

Severity

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/openemr/openemr/security/advis…	x_refsource_CONFIRM
https://github.com/openemr/openemr/commit/ddcf04e…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
openemr	openemr	Affected: < 8.0.0.2

Show details on NVD website

JSON

To clipboard

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CVE-2026-25895 (GCVE-0-2026-25895)

Vulnerability from cvelistv5 – Published: 2026-02-09 22:29 – Updated: 2026-02-11 21:24

Title

FUXA Unauthenticated Remote Code Execution via Arbitrary File Write in Upload API

Summary

FUXA is a web-based Process Visualization (SCADA/HMI/Dashboard) software. A path traversal vulnerability in FUXA allows an unauthenticated, remote attacker to write arbitrary files to arbitrary locations on the server filesystem. This affects FUXA through version 1.2.9. This issue has been patched in FUXA version 1.2.10.

Severity

9.5 (Critical)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-306 - Missing Authentication for Critical Function

Assigner

GitHub_M

References

3 references

URL	Tags
https://github.com/frangoteam/FUXA/security/advis…	x_refsource_CONFIRM
https://github.com/frangoteam/FUXA/commit/22c2192…	x_refsource_MISC
https://github.com/frangoteam/FUXA/releases/tag/v1.2.10	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
frangoteam	FUXA	Affected: < 1.2.10

Show details on NVD website

JSON

To clipboard

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CVE-2026-25891 (GCVE-0-2026-25891)

Vulnerability from cvelistv5 – Published: 2026-02-24 21:08 – Updated: 2026-02-24 21:39

Title

Fiber has an Arbitrary File Read in Static Middleware on Windows

Summary

Fiber is an Express inspired web framework written in Go. A Path Traversal (CWE-22) vulnerability in Fiber allows a remote attacker to bypass the static middleware sanitizer and read arbitrary files on the server file system on Windows. This affects Fiber v3 through version 3.0.0. This has been patched in Fiber v3 version 3.1.0.

Severity

7.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

GitHub_M

References

3 references

URL	Tags
https://github.com/gofiber/fiber/security/advisor…	x_refsource_CONFIRM
https://github.com/gofiber/fiber/pull/4064	x_refsource_MISC
https://github.com/gofiber/fiber/commit/591337023…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
gofiber	fiber	Affected: >= 3.0.0, < 3.1.0

Show details on NVD website

JSON

To clipboard

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CVE-2026-25872 (GCVE-0-2026-25872)

Vulnerability from cvelistv5 – Published: 2026-02-10 22:25 – Updated: 2026-05-11 23:11

Title

JUNG Smart Panel 5.1 KNX Unauthenticated Path Traversal

Summary

JUNG Smart Panel KNX firmware version L1.12.22 and prior contain an unauthenticated path traversal vulnerability in the embedded web interface. The application fails to properly validate file path input, allowing remote, unauthenticated attackers to access arbitrary files on the underlying filesystem within the context of the web server. This may result in disclosure of system configuration files and other sensitive information.

Severity

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

VulnCheck

References

4 references

URL	Tags
https://www.zeroscience.mk/en/vulnerabilities/ZSL…	technical-descriptionexploit
https://www.jung-group.com/	product
https://downloads.jung.de/public/en/pdf/productdo…	product
https://www.vulncheck.com/advisories/jung-smart-p…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
ALBRECHT JUNG GMBH & CO. KG	JUNG Smart Panel 5.1 KNX	Affected: 0 , ≤ L1.12.22 (custom)

Credits

Gjoko Krstic of Zero Science Lab

Show details on NVD website

JSON

To clipboard

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CVE-2026-25869 (GCVE-0-2026-25869)

Vulnerability from cvelistv5 – Published: 2026-02-11 15:40 – Updated: 2026-07-14 15:53 Unsupported When Assigned

Title

MiniGal Nano <= 0.3.5 Path Traversal via dir Parameter

Summary

MiniGal Nano versions 0.3.5 and prior contain a path traversal vulnerability in index.php via the dir parameter. The application appends user-controlled input to the photos directory and attempts to prevent traversal by removing dot-dot sequences, but this protection can be bypassed using crafted directory patterns. An attacker can exploit this behavior to cause the application to enumerate and display image files from unintended filesystem locations that are readable by the web server, resulting in unintended information disclosure.

Severity

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

VulnCheck

References

3 references

URL	Tags
https://web.archive.org/web/20180330004313/http:/…	product
https://sourceforge.net/projects/minigalnano/	product
https://www.vulncheck.com/advisories/minigal-nano…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
MiniGal	MiniGal Nano	Affected: 0 , ≤ 0.3.5 (semver)

Credits

philopentest

Show details on NVD website

JSON

To clipboard

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CVE-2026-25785 (GCVE-0-2026-25785)

Vulnerability from cvelistv5 – Published: 2026-02-25 06:01 – Updated: 2026-02-25 21:15

Summary

Path traversal vulnerability exists in Lanscope Endpoint Manager (On-Premises) Sub-Manager Server Ver.9.4.7.3 and earlier, which may allow an attacker to tamper with arbitrary files and execute arbitrary code on the affected system.

Severity

9.8 (Critical)


                        
                          CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

9.3 (Critical)


                        
                          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

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-22 - Improper limitation of a pathname to a restricted directory ('Path Traversal')

Assigner

jpcert

References

2 references

URL	Tags
https://www.motex.co.jp/news/notice/2026/release260225/
https://jvn.jp/en/jp/JVN79096585/

Impacted products

1 product

Vendor	Product	Version
MOTEX Inc.	Lanscope Endpoint Manager (On-Premises) Sub-Manager Server	Affected: Ver.9.4.7.3 and earlier

Show details on NVD website

JSON

To clipboard

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CVE-2026-25770 (GCVE-0-2026-25770)

Vulnerability from cvelistv5 – Published: 2026-03-17 18:02 – Updated: 2026-03-18 13:05

Title

Wazuh has Privilege Escalation to Root via Cluster Protocol File Write

Summary

Wazuh is a free and open source platform used for threat prevention, detection, and response. Starting in version 3.9.0 and prior to version 4.14.3, a privilege escalation vulnerability exists in the Wazuh Manager's cluster synchronization protocol. The `wazuh-clusterd` service allows authenticated nodes to write arbitrary files to the manager’s file system with the permissions of the `wazuh` system user. Due to insecure default permissions, the `wazuh` user has write access to the manager's main configuration file (`/var/ossec/etc/ossec.conf`). By leveraging the cluster protocol to overwrite `ossec.conf`, an attacker can inject a malicious `<localfile>` command block. The `wazuh-logcollector` service, which runs as root, parses this configuration and executes the injected command. This chain allows an attacker with cluster credentials to gain full Root Remote Code Execution, violating the principle of least privilege and bypassing the intended security model. Version 4.14.3 fixes the issue.

Severity

9.1 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-269 - Improper Privilege Management
CWE-732 - Incorrect Permission Assignment for Critical Resource

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/wazuh/wazuh/security/advisorie…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
wazuh	wazuh	Affected: >= 3.9.0, < 4.14.3

Show details on NVD website

JSON

To clipboard

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CVE-2026-25766 (GCVE-0-2026-25766)

Vulnerability from cvelistv5 – Published: 2026-02-19 15:49 – Updated: 2026-02-19 19:46

Title

Echo has a Windows path traversal via backslash in middleware.Static default filesystem

Summary

Echo is a Go web framework. In versions 5.0.0 through 5.0.2 on Windows, Echo’s `middleware.Static` using the default filesystem allows path traversal via backslashes, enabling unauthenticated remote file read outside the static root. In `middleware/static.go`, the requested path is unescaped and normalized with `path.Clean` (URL semantics). `path.Clean` does not treat `\` as a path separator, so `..\` sequences remain in the cleaned path. The resulting path is then passed to `currentFS.Open(...)`. When the filesystem is left at the default (nil), Echo uses `defaultFS` which calls `os.Open` (`echo.go:792`). On Windows, `os.Open` treats `\` as a path separator and resolves `..\`, allowing traversal outside the static root. Version 5.0.3 fixes the issue.

Severity

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

GitHub_M

References

3 references

URL	Tags
https://github.com/labstack/echo/security/advisor…	x_refsource_CONFIRM
https://github.com/labstack/echo/pull/2891	x_refsource_MISC
https://github.com/labstack/echo/commit/b1d443086…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
labstack	echo	Affected: >= 5.0.0, < 5.0.3

Show details on NVD website

JSON

To clipboard

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CVE-2026-25760 (GCVE-0-2026-25760)

Vulnerability from cvelistv5 – Published: 2026-02-06 21:32 – Updated: 2026-02-09 15:26

Title

Website Path Traversal / Arbitrary File Read (Authenticated) in Sliver

Summary

Sliver is a command and control framework that uses a custom Wireguard netstack. Prior to 1.6.11, a path traversal in the website content subsystem lets an authenticated operator read arbitrary files on the Sliver server host. This is an authenticated path traversal / arbitrary file read issue, and it can expose credentials, configs, and keys. This vulnerability is fixed in 1.6.11.

Severity

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/BishopFox/sliver/security/advi…	x_refsource_CONFIRM
https://github.com/BishopFox/sliver/commit/818127…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
BishopFox	sliver	Affected: < 1.6.11

Show details on NVD website

JSON

To clipboard

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Mitigation MIT-5.1

Implementation

Strategy: Input Validation

Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue."
Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.
When validating filenames, use stringent allowlists that limit the character set to be used. If feasible, only allow a single "." character in the filename to avoid weaknesses such as CWE-23, and exclude directory separators such as "/" to avoid CWE-36. Use a list of allowable file extensions, which will help to avoid CWE-434.
Do not rely exclusively on a filtering mechanism that removes potentially dangerous characters. This is equivalent to a denylist, which may be incomplete (CWE-184). For example, filtering "/" is insufficient protection if the filesystem also supports the use of "\" as a directory separator. Another possible error could occur when the filtering is applied in a way that still produces dangerous data (CWE-182). For example, if "../" sequences are removed from the ".../...//" string in a sequential fashion, two instances of "../" would be removed from the original string, but the remaining characters would still form the "../" string.

Mitigation MIT-15

Architecture and Design

For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.

Mitigation MIT-20.1

Implementation

Strategy: Input Validation

Inputs should be decoded and canonicalized to the application's current internal representation before being validated (CWE-180). Make sure that the application does not decode the same input twice (CWE-174). Such errors could be used to bypass allowlist validation schemes by introducing dangerous inputs after they have been checked.
Use a built-in path canonicalization function (such as realpath() in C) that produces the canonical version of the pathname, which effectively removes ".." sequences and symbolic links (CWE-23, CWE-59). This includes:
realpath() in C
getCanonicalPath() in Java
GetFullPath() in ASP.NET
realpath() or abs_path() in Perl
realpath() in PHP

Mitigation MIT-4

Architecture and Design

Strategy: Libraries or Frameworks

Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid [REF-1482].

Mitigation MIT-29

Operation

Strategy: Firewall

Use an application firewall that can detect attacks against this weakness. It can be beneficial in cases in which the code cannot be fixed (because it is controlled by a third party), as an emergency prevention measure while more comprehensive software assurance measures are applied, or to provide defense in depth [REF-1481].

Mitigation MIT-17

Architecture and Design Operation

Strategy: Environment Hardening

Run your code using the lowest privileges that are required to accomplish the necessary tasks [REF-76]. If possible, create isolated accounts with limited privileges that are only used for a single task. That way, a successful attack will not immediately give the attacker access to the rest of the software or its environment. For example, database applications rarely need to run as the database administrator, especially in day-to-day operations.

Mitigation MIT-21.1

Architecture and Design

Strategy: Enforcement by Conversion

When the set of acceptable objects, such as filenames or URLs, is limited or known, create a mapping from a set of fixed input values (such as numeric IDs) to the actual filenames or URLs, and reject all other inputs.
For example, ID 1 could map to "inbox.txt" and ID 2 could map to "profile.txt". Features such as the ESAPI AccessReferenceMap [REF-185] provide this capability.

Mitigation MIT-22

Architecture and Design Operation

Strategy: Sandbox or Jail

Run the code in a "jail" or similar sandbox environment that enforces strict boundaries between the process and the operating system. This may effectively restrict which files can be accessed in a particular directory or which commands can be executed by the software.
OS-level examples include the Unix chroot jail, AppArmor, and SELinux. In general, managed code may provide some protection. For example, java.io.FilePermission in the Java SecurityManager allows the software to specify restrictions on file operations.
This may not be a feasible solution, and it only limits the impact to the operating system; the rest of the application may still be subject to compromise.
Be careful to avoid CWE-243 and other weaknesses related to jails.

Mitigation MIT-34

Architecture and Design Operation

Strategy: Attack Surface Reduction

Store library, include, and utility files outside of the web document root, if possible. Otherwise, store them in a separate directory and use the web server's access control capabilities to prevent attackers from directly requesting them. One common practice is to define a fixed constant in each calling program, then check for the existence of the constant in the library/include file; if the constant does not exist, then the file was directly requested, and it can exit immediately.
This significantly reduces the chance of an attacker being able to bypass any protection mechanisms that are in the base program but not in the include files. It will also reduce the attack surface.

Mitigation MIT-39

Implementation

Ensure that error messages only contain minimal details that are useful to the intended audience and no one else. The messages need to strike the balance between being too cryptic (which can confuse users) or being too detailed (which may reveal more than intended). The messages should not reveal the methods that were used to determine the error. Attackers can use detailed information to refine or optimize their original attack, thereby increasing their chances of success.
If errors must be captured in some detail, record them in log messages, but consider what could occur if the log messages can be viewed by attackers. Highly sensitive information such as passwords should never be saved to log files.
Avoid inconsistent messaging that might accidentally tip off an attacker about internal state, such as whether a user account exists or not.
In the context of path traversal, error messages which disclose path information can help attackers craft the appropriate attack strings to move through the file system hierarchy.

Mitigation MIT-16

Operation Implementation

Strategy: Environment Hardening

When using PHP, configure the application so that it does not use register_globals. During implementation, develop the application so that it does not rely on this feature, but be wary of implementing a register_globals emulation that is subject to weaknesses such as CWE-95, CWE-621, and similar issues.

CAPEC-126: Path Traversal

An adversary uses path manipulation methods to exploit insufficient input validation of a target to obtain access to data that should be not be retrievable by ordinary well-formed requests. A typical variety of this attack involves specifying a path to a desired file together with dot-dot-slash characters, resulting in the file access API or function traversing out of the intended directory structure and into the root file system. By replacing or modifying the expected path information the access function or API retrieves the file desired by the attacker. These attacks either involve the attacker providing a complete path to a targeted file or using control characters (e.g. path separators (/ or \) and/or dots (.)) to reach desired directories or files.

CAPEC-64: Using Slashes and URL Encoding Combined to Bypass Validation Logic

This attack targets the encoding of the URL combined with the encoding of the slash characters. An attacker can take advantage of the multiple ways of encoding a URL and abuse the interpretation of the URL. A URL may contain special character that need special syntax handling in order to be interpreted. Special characters are represented using a percentage character followed by two digits representing the octet code of the original character (%HEX-CODE). For instance US-ASCII space character would be represented with %20. This is often referred as escaped ending or percent-encoding. Since the server decodes the URL from the requests, it may restrict the access to some URL paths by validating and filtering out the URL requests it received. An attacker will try to craft an URL with a sequence of special characters which once interpreted by the server will be equivalent to a forbidden URL. It can be difficult to protect against this attack since the URL can contain other format of encoding such as UTF-8 encoding, Unicode-encoding, etc.

CAPEC-76: Manipulating Web Input to File System Calls

An attacker manipulates inputs to the target software which the target software passes to file system calls in the OS. The goal is to gain access to, and perhaps modify, areas of the file system that the target software did not intend to be accessible.

CAPEC-78: Using Escaped Slashes in Alternate Encoding

This attack targets the use of the backslash in alternate encoding. An adversary can provide a backslash as a leading character and causes a parser to believe that the next character is special. This is called an escape. By using that trick, the adversary tries to exploit alternate ways to encode the same character which leads to filter problems and opens avenues to attack.

CAPEC-79: Using Slashes in Alternate Encoding

This attack targets the encoding of the Slash characters. An adversary would try to exploit common filtering problems related to the use of the slashes characters to gain access to resources on the target host. Directory-driven systems, such as file systems and databases, typically use the slash character to indicate traversal between directories or other container components. For murky historical reasons, PCs (and, as a result, Microsoft OSs) choose to use a backslash, whereas the UNIX world typically makes use of the forward slash. The schizophrenic result is that many MS-based systems are required to understand both forms of the slash. This gives the adversary many opportunities to discover and abuse a number of common filtering problems. The goal of this pattern is to discover server software that only applies filters to one version, but not the other.

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