CWE-116
Improper Encoding or Escaping of Output
The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.
CVE-2026-26953 (GCVE-0-2026-26953)
Vulnerability from cvelistv5 – Published: 2026-02-19 22:50 – Updated: 2026-02-20 15:39
VLAI
Title
Pi-hole Web Interface has Stored HTML Injection via X-Forwarded-For Header in Active Sessions Table
Summary
Pi-hole Admin Interface is a web interface for managing Pi-hole, a network-level ad and internet tracker blocking application. Versions 6.0 and above have a Stored HTML Injection vulnerability in the active sessions table located on the API settings page, allowing an attacker with valid credentials to inject arbitrary HTML code that will be rendered in the browser of any administrator who visits the active sessions page. The rowCallback function contains the value data.x_forwarded_for, which is directly concatenated into an HTML string and inserted into the DOM using jQuery’s .html() method. This method interprets the content as HTML, which means that any HTML tags present in the value will be parsed and rendered by the browser. An attacker can use common tools such as curl, wget, Python requests, Burp Suite, or even JavaScript fetch() to send an authentication request with an X-Forwarded-For header that contains malicious HTML code instead of a legitimate IP address. Since Pi-hole implements a Content Security Policy (CSP) that blocks inline JavaScript, the impact is limited to pure HTML injection without the ability to execute scripts. This issue has been fixed in version 6.4.1.
Severity
5.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/pi-hole/web/security/advisorie… | x_refsource_CONFIRM |
| https://github.com/pi-hole/web/commit/1a0c6f4fe6d… | x_refsource_MISC |
| https://github.com/pi-hole/web/releases/tag/v6.4.1 | x_refsource_MISC |
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CVE-2026-27013 (GCVE-0-2026-27013)
Vulnerability from cvelistv5 – Published: 2026-02-19 19:38 – Updated: 2026-02-19 21:21
VLAI
Title
Fabric.js Affected by Stored XSS via SVG Export
Summary
Fabric.js is a Javascript HTML5 canvas library. Prior to version 7.2.0, Fabric.js applies `escapeXml()` to text content during SVG export (`src/shapes/Text/TextSVGExportMixin.ts:186`) but fails to apply it to other user-controlled string values that are interpolated into SVG attribute markup. When attacker-controlled JSON is loaded via `loadFromJSON()` and later exported via `toSVG()`, the unescaped values break out of XML attributes and inject arbitrary SVG elements including event handlers. Any application that accepts user-supplied JSON (via `loadFromJSON()`, collaborative sharing, import features, CMS plugins) and renders the `toSVG()` output in a browser context (SVG preview, export download rendered in-page, email template, embed) is vulnerable to stored XSS. An attacker can execute arbitrary JavaScript in the victim's browser session. Version 7.2.0 contains a fix.
Severity
7.6 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/fabricjs/fabric.js/security/ad… | x_refsource_CONFIRM |
| https://github.com/fabricjs/fabric.js/commit/7e1a… | x_refsource_MISC |
| https://github.com/fabricjs/fabric.js/releases/tag/v720 | x_refsource_MISC |
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CVE-2026-27016 (GCVE-0-2026-27016)
Vulnerability from cvelistv5 – Published: 2026-02-20 01:34 – Updated: 2026-02-20 15:34
VLAI
Title
LibreNMS has Stored XSS in Custom OID - unit parameter missing strip_tags()
Summary
LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. Versions 24.10.0 through 26.1.1 are vulnerable to Stored XSS via the unit parameter in Custom OID. The Custom OID functionality lacks strip_tags() sanitization while other fields (name, oid, datatype) are sanitized. The unsanitized value is stored in the database and rendered without HTML escaping. This issue is fixed in version 26.2.0.
Severity
5.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/librenms/librenms/security/adv… | x_refsource_CONFIRM |
| https://github.com/librenms/librenms/pull/19040 | x_refsource_MISC |
| https://github.com/librenms/librenms/commit/3bea2… | x_refsource_MISC |
| https://github.com/librenms/librenms/releases/tag… | x_refsource_MISC |
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CVE-2026-27169 (GCVE-0-2026-27169)
Vulnerability from cvelistv5 – Published: 2026-02-20 23:51 – Updated: 2026-02-25 21:23
VLAI
Title
OpenSift: Persistent XSS Chat Tool Rendering
Summary
OpenSift is an AI study tool that sifts through large datasets using semantic search and generative AI. Versions 1.1.2-alpha and below render untrusted user/model content in chat tool UI surfaces using unsafe HTML interpolation patterns, leading to XSS. Stored content can execute JavaScript when later viewed in authenticated sessions. An attacker who can influence stored study/quiz/flashcard content could trigger script execution in a victim’s browser, potentially performing actions as that user in the local app session. This issue has been fixed in version 1.1.3-alpha.
Severity
8.9 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/OpenSift/OpenSift/security/adv… | x_refsource_CONFIRM |
| https://github.com/OpenSift/OpenSift/releases/tag… | x_refsource_MISC |
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CVE-2026-27469 (GCVE-0-2026-27469)
Vulnerability from cvelistv5 – Published: 2026-02-21 07:24 – Updated: 2026-02-24 18:50
VLAI
Title
Isso: Stored XSS via comment website field
Summary
Isso is a lightweight commenting server written in Python and JavaScript. In commits before 0afbfe0691ee237963e8fb0b2ee01c9e55ca2144, there is a stored Cross-Site Scripting (XSS) vulnerability affecting the website and author comment fields. The website field was HTML-escaped using quote=False, which left single and double quotes unescaped. Since the frontend inserts the website value directly into a single-quoted href attribute via string concatenation, a single quote in the URL breaks out of the attribute context, allowing injection of arbitrary event handlers (e.g. onmouseover, onclick). The same escaping is missing entirely from the user-facing comment edit endpoint (PUT /id/) and the moderation edit endpoint (POST /id//edit/). This issue has been patched in commit 0afbfe0691ee237963e8fb0b2ee01c9e55ca2144. To workaround, nabling comment moderation (moderation = enabled = true in isso.cfg) prevents unauthenticated users from publishing comments, raising the bar for exploitation, but it does not fully mitigate the issue since a moderator activating a malicious comment would still expose visitors.
Severity
6.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/isso-comments/isso/security/ad… | x_refsource_CONFIRM |
| https://github.com/isso-comments/isso/commit/0afb… | x_refsource_MISC |
| https://docs.python.org/3/library/html.html#html.escape | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| isso-comments | isso |
Affected:
< 0afbfe0691ee237963e8fb0b2ee01c9e55ca2144
|
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CVE-2026-27512 (GCVE-0-2026-27512)
Vulnerability from cvelistv5 – Published: 2026-02-23 16:26 – Updated: 2026-05-25 23:41
VLAI
Title
Tenda F3 Reflected Script Execution via Missing nosniff Header
Summary
Shenzhen Tenda F3 Wireless Router firmware V12.01.01.55_multi contains a content-type confusion vulnerability in the administrative interface. Responses omit the X-Content-Type-Options: nosniff header and include attacker-influenced content that can be reflected into the response body. Under affected browser behaviors, MIME sniffing may cause the response to be interpreted as active HTML, enabling script execution in the context of the administrative interface.
Severity
6.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://www.tendacn.com/product/F3 | product |
| https://www.vulncheck.com/advisories/tenda-f3-ref… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Shenzhen Tenda Technology Co., Ltd. | Tenda F3 |
Affected:
0 , ≤ 12.01.01.55_multi
(custom)
|
Credits
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CVE-2026-27812 (GCVE-0-2026-27812)
Vulnerability from cvelistv5 – Published: 2026-02-26 00:00 – Updated: 2026-02-26 14:53
VLAI
Title
Sub2API Vulnerable to Password Reset Poisoning via Host Header Trust Issue, Leading to Account Takeover
Summary
Sub2API is an AI API gateway platform designed to distribute and manage API quotas from AI product subscriptions. A vulnerability in versions prior to 0.1.85 is a Password Reset Poisoning (Host Header / Forwarded Header trust issue), which allows attackers to manipulate the password reset link. Attackers can exploit this flaw to inject their own domain into the password reset link, leading to the potential for account takeover. The vulnerability has been fixed in version v0.1.85. If upgrading is not immediately possible, users can mitigate the vulnerability by disabling the "forgot password" feature until an upgrade to a patched version can be performed. This will prevent attackers from exploiting the vulnerability via the affected endpoint.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-116 - Improper Encoding or Escaping of Output
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/Wei-Shaw/sub2api/security/advi… | x_refsource_CONFIRM |
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CVE-2026-28348 (GCVE-0-2026-28348)
Vulnerability from cvelistv5 – Published: 2026-03-05 19:49 – Updated: 2026-03-06 17:55
VLAI
Title
lxml_html_clean: CSS @import Filter Bypass via Unicode Escapes
Summary
lxml_html_clean is a project for HTML cleaning functionalities copied from `lxml.html.clean`. Prior to version 0.4.4, the _has_sneaky_javascript() method strips backslashes before checking for dangerous CSS keywords. This causes CSS Unicode escape sequences to bypass the @import and expression() filters, allowing external CSS loading or XSS in older browsers. This issue has been patched in version 0.4.4.
Severity
6.1 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-116 - Improper Encoding or Escaping of Output
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/fedora-python/lxml_html_clean/… | x_refsource_CONFIRM |
| https://github.com/fedora-python/lxml_html_clean/… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| fedora-python | lxml_html_clean |
Affected:
< 0.4.4
|
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CVE-2026-28350 (GCVE-0-2026-28350)
Vulnerability from cvelistv5 – Published: 2026-03-05 19:49 – Updated: 2026-03-06 17:05
VLAI
Title
lxml_html_clean: <base> tag injection through default Cleaner configuration
Summary
lxml_html_clean is a project for HTML cleaning functionalities copied from `lxml.html.clean`. Prior to version 0.4.4, the <base> tag passes through the default Cleaner configuration. While page_structure=True removes html, head, and title tags, there is no specific handling for <base>, allowing an attacker to inject it and hijack relative links on the page. This issue has been patched in version 0.4.4.
Severity
6.1 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-116 - Improper Encoding or Escaping of Output
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/fedora-python/lxml_html_clean/… | x_refsource_CONFIRM |
| https://github.com/fedora-python/lxml_html_clean/… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| fedora-python | lxml_html_clean |
Affected:
< 0.4.4
|
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CVE-2026-28499 (GCVE-0-2026-28499)
Vulnerability from cvelistv5 – Published: 2026-03-18 01:19 – Updated: 2026-03-18 14:08
VLAI
Title
LeafKit's HTML escaping may be skipped for Collection values, enabling XSS
Summary
LeafKit is a templating language with Swift-inspired syntax. Prior to version 1.14.2, HTML escaping doesn't work correctly when a template prints a collection (Array / Dictionary) via `#(value)`. This can result in XSS, allowing potentially untrusted input to be rendered unescaped. Version 1.14.2 fixes the issue.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/vapor/leaf-kit/security/adviso… | x_refsource_CONFIRM |
| https://github.com/vapor/leaf-kit/commit/6044b844… | x_refsource_MISC |
| https://github.com/vapor/leaf-kit/releases/tag/1.14.2 | x_refsource_MISC |
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Mitigation ID: MIT-4.3
Phase: Architecture and Design
Strategy: Libraries or Frameworks
Description:
- Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
- For example, consider using the ESAPI Encoding control [REF-45] or a similar tool, library, or framework. These will help the programmer encode outputs in a manner less prone to error.
- Alternately, use built-in functions, but consider using wrappers in case those functions are discovered to have a vulnerability.
Mitigation ID: MIT-27
Phase: Architecture and Design
Strategy: Parameterization
Description:
- If available, use structured mechanisms that automatically enforce the separation between data and code. These mechanisms may be able to provide the relevant quoting, encoding, and validation automatically, instead of relying on the developer to provide this capability at every point where output is generated.
- For example, stored procedures can enforce database query structure and reduce the likelihood of SQL injection.
Mitigation
Phases: Architecture and Design, Implementation
Description:
- Understand the context in which your data will be used and the encoding that will be expected. This is especially important when transmitting data between different components, or when generating outputs that can contain multiple encodings at the same time, such as web pages or multi-part mail messages. Study all expected communication protocols and data representations to determine the required encoding strategies.
Mitigation
Phase: Architecture and Design
Description:
- In some cases, input validation may be an important strategy when output encoding is not a complete solution. For example, you may be providing the same output that will be processed by multiple consumers that use different encodings or representations. In other cases, you may be required to allow user-supplied input to contain control information, such as limited HTML tags that support formatting in a wiki or bulletin board. When this type of requirement must be met, use an extremely strict allowlist to limit which control sequences can be used. Verify that the resulting syntactic structure is what you expect. Use your normal encoding methods for the remainder of the input.
Mitigation
Phase: Architecture and Design
Description:
- Use input validation as a defense-in-depth measure to reduce the likelihood of output encoding errors (see CWE-20).
Mitigation
Phase: Requirements
Description:
- Fully specify which encodings are required by components that will be communicating with each other.
Mitigation
Phase: Implementation
Description:
- When exchanging data between components, ensure that both components are using the same character encoding. Ensure that the proper encoding is applied at each interface. Explicitly set the encoding you are using whenever the protocol allows you to do so.
CAPEC-104: Cross Zone Scripting
An attacker is able to cause a victim to load content into their web-browser that bypasses security zone controls and gain access to increased privileges to execute scripting code or other web objects such as unsigned ActiveX controls or applets. This is a privilege elevation attack targeted at zone-based web-browser security.
CAPEC-73: User-Controlled Filename
An attack of this type involves an adversary inserting malicious characters (such as a XSS redirection) into a filename, directly or indirectly that is then used by the target software to generate HTML text or other potentially executable content. Many websites rely on user-generated content and dynamically build resources like files, filenames, and URL links directly from user supplied data. In this attack pattern, the attacker uploads code that can execute in the client browser and/or redirect the client browser to a site that the attacker owns. All XSS attack payload variants can be used to pass and exploit these vulnerabilities.
CAPEC-81: Web Server Logs Tampering
Web Logs Tampering attacks involve an attacker injecting, deleting or otherwise tampering with the contents of web logs typically for the purposes of masking other malicious behavior. Additionally, writing malicious data to log files may target jobs, filters, reports, and other agents that process the logs in an asynchronous attack pattern. This pattern of attack is similar to "Log Injection-Tampering-Forging" except that in this case, the attack is targeting the logs of the web server and not the application.
CAPEC-85: AJAX Footprinting
This attack utilizes the frequent client-server roundtrips in Ajax conversation to scan a system. While Ajax does not open up new vulnerabilities per se, it does optimize them from an attacker point of view. A common first step for an attacker is to footprint the target environment to understand what attacks will work. Since footprinting relies on enumeration, the conversational pattern of rapid, multiple requests and responses that are typical in Ajax applications enable an attacker to look for many vulnerabilities, well-known ports, network locations and so on. The knowledge gained through Ajax fingerprinting can be used to support other attacks, such as XSS.