Common Weakness Enumeration
CWE-87
AllowedImproper Neutralization of Alternate XSS Syntax
Abstraction: Variant · Status: Draft
The product does not neutralize or incorrectly neutralizes user-controlled input for alternate script syntax.
98 vulnerabilities reference this CWE, most recent first.
CVE-2025-8561 (GCVE-0-2025-8561)
Vulnerability from cvelistv5 – Published: 2025-10-15 05:23 – Updated: 2026-04-08 17:27
VLAI
EPSS
VEX
Title
Ova Advent <= 1.1.7 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode
Summary
The Ova Advent plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's shortcodes in all versions up to, and including, 1.1.7 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Severity
6.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-87 - Improper Neutralization of Alternate XSS Syntax
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| ovatheme | Ova Advent |
Affected:
0 , ≤ 1.1.7
(semver)
|
Credits
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CVE-2024-43381 (GCVE-0-2024-43381)
Vulnerability from cvelistv5 – Published: 2024-08-16 14:38 – Updated: 2024-08-16 15:01
VLAI
EPSS
VEX
Title
reNgine vulnerable to Stored Cross-Site Scripting (XSS) via DNS Record Poisoning
Summary
reNgine is an automated reconnaissance framework for web applications. Versions 2.1.2 and prior are susceptible to Stored Cross-Site Scripting (XSS) attacks. This vulnerability occurs when scanning a domain, and if the target domain's DNS record contains an XSS payload, it leads to the execution of malicious scripts in the reNgine's dashboard view when any user views the scan results. The XSS payload is directly fetched from the DNS record of the remote target domain. Consequently, an attacker can execute the attack without requiring any additional input from the target or the reNgine user. A patch is available and expected to be part of version 2.1.3.
Severity
5 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/yogeshojha/rengine/security/ad… | x_refsource_CONFIRM |
| https://github.com/yogeshojha/rengine/commit/064b… | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| yogeshojha | rengine |
Affected:
<= 2.1.2
|
|
| rengine_project | rengine |
Affected:
0 , ≤ 2.1.2
(custom)
cpe:2.3:a:rengine_project:rengine:*:*:*:*:*:*:*:* |
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CVE-2024-25640 (GCVE-0-2024-25640)
Vulnerability from cvelistv5 – Published: 2024-02-19 19:56 – Updated: 2024-08-01 23:44
VLAI
EPSS
VEX
Title
Improper Neutralization of Alternate XSS Syntax in iris-web
Summary
Iris is a web collaborative platform that helps incident responders share technical details during investigations. A stored Cross-Site Scripting (XSS) vulnerability has been identified in iris-web, affecting multiple locations in versions prior to v2.4.0. The vulnerability may allow an attacker to inject malicious scripts into the application, which could then be executed when a user visits the affected locations. This could lead to unauthorized access, data theft, or other related malicious activities. An attacker need to be authenticated on the application to exploit this vulnerability. The issue is fixed in version v2.4.0 of iris-web. No workarounds are available.
Severity
4.6 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-87 - Improper Neutralization of Alternate XSS Syntax
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/dfir-iris/iris-web/security/ad… | x_refsource_CONFIRM |
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CVE-2024-8505 (GCVE-0-2024-8505)
Vulnerability from cvelistv5 – Published: 2024-10-02 09:31 – Updated: 2026-04-08 17:22
VLAI
EPSS
VEX
Title
WordPress Infinite Scroll - Ajax Load More <= 7.1.2 - Authenticated (Contributor+) Stored Cross-Site Scripting via button_label Parameter
Summary
The WordPress Infinite Scroll – Ajax Load More plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘button_label’ parameter in all versions up to, and including, 7.1.2 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Severity
6.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-87 - Improper Neutralization of Alternate XSS Syntax
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| dcooney | Ajax Load More – Infinite Scroll, Load More, & Lazy Load |
Affected:
0 , ≤ 7.1.2
(semver)
|
|
| connekthq | ajax_load_more |
Affected:
0 , ≤ 7.1.2
(semver)
cpe:2.3:a:connekthq:ajax_load_more:*:*:*:*:*:wordpress:*:* |
Credits
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CVE-2024-4459 (GCVE-0-2024-4459)
Vulnerability from cvelistv5 – Published: 2024-06-06 03:32 – Updated: 2026-04-08 17:24
VLAI
EPSS
VEX
Title
Themesflat Addons For Elementor <= 2.1.2 - Authenticated (Contributor+) Stored Cross-Site Scripting via Widget Titles
Summary
The Themesflat Addons For Elementor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's widget's titles in all versions up to, and including, 2.1.2 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Severity
6.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-87 - Improper Neutralization of Alternate XSS Syntax
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| themesflat | Themesflat Addons For Elementor |
Affected:
0 , ≤ 2.1.2
(semver)
|
Credits
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CVE-2024-3666 (GCVE-0-2024-3666)
Vulnerability from cvelistv5 – Published: 2024-05-22 07:37 – Updated: 2026-04-08 17:20
VLAI
EPSS
VEX
Title
Opal Estate Pro – Property Management and Submission <= 1.7.6 - Authenticated (Contributor+) Stored Cross-Site Scripting
Summary
The Opal Estate Pro – Property Management and Submission plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the agent latitude and longitude parameters in all versions up to, and including, 1.7.6 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Severity
6.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-87 - Improper Neutralization of Alternate XSS Syntax
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| wpopal | Opal Estate Pro – Property Management and Submission |
Affected:
0 , ≤ 1.7.6
(semver)
|
|
| wpopal | opal_estate_pro |
Affected:
0 , ≤ 1.7.6
(semver)
cpe:2.3:a:wpopal:opal_estate_pro:*:*:*:*:*:*:*:* |
Credits
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CVE-2024-3519 (GCVE-0-2024-3519)
Vulnerability from cvelistv5 – Published: 2024-05-21 23:30 – Updated: 2026-04-08 17:03
VLAI
EPSS
VEX
Title
Media Library Assistant <= 3.15 - Reflected Cross-Site Scripting via lang
Summary
The Media Library Assistant plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the lang parameter in all versions up to, and including, 3.15 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.
Severity
6.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-87 - Improper Neutralization of Alternate XSS Syntax
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| dglingren | Media Library Assistant |
Affected:
0 , ≤ 3.15
(semver)
|
Credits
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CVE-2024-3162 (GCVE-0-2024-3162)
Vulnerability from cvelistv5 – Published: 2024-04-03 02:32 – Updated: 2026-04-08 17:26
VLAI
EPSS
VEX
Title
Jeg Elementor Kit <= 2.6.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via Testimonial
Summary
The Jeg Elementor Kit plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Testimonial Widget Attributes in all versions up to, and including, 2.6.3 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor access or higher, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. CVE-2024-32721 is likely a duplicate of this issue.
Severity
6.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-87 - Improper Neutralization of Alternate XSS Syntax
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| jegtheme | Jeg Kit for Elementor – Powerful Addons for Elementor, Widgets & Templates for WordPress |
Affected:
0 , ≤ 2.6.3
(semver)
|
Credits
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CVE-2024-2750 (GCVE-0-2024-2750)
Vulnerability from cvelistv5 – Published: 2024-05-02 16:51 – Updated: 2026-04-08 16:44
VLAI
EPSS
VEX
Title
Exclusive Addons for Elementor <= 2.6.9.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via Button Widget
Summary
The Exclusive Addons for Elementor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the URL attribute of the Button widget in all versions up to, and including, 2.6.9.3 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor access or higher, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Severity
6.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-87 - Improper Neutralization of Alternate XSS Syntax
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| timstrifler | Exclusive Addons for Elementor |
Affected:
0 , ≤ 2.6.9.3
(semver)
|
Credits
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CVE-2024-2657 (GCVE-0-2024-2657)
Vulnerability from cvelistv5 – Published: 2024-05-30 08:30 – Updated: 2026-04-08 16:48
VLAI
EPSS
VEX
Title
Font Farsi <= 1.6.6 - Authenticated (Administrator+) Stored Cross-Site Scripting
Summary
The Font Farsi plugin for WordPress is vulnerable to Stored Cross-Site Scripting via admin settings in all versions up to, and including, 1.6.6 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.
Severity
4.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-87 - Improper Neutralization of Alternate XSS Syntax
Assigner
References
2 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| khl32 | Font Farsi |
Affected:
0 , ≤ 1.6.6
(semver)
|
Credits
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Mitigation
Implementation
Resolve all input to absolute or canonical representations before processing.
Mitigation
Implementation
Carefully check each input parameter against a rigorous positive specification (allowlist) defining the specific characters and format allowed. All input should be neutralized, not just parameters that the user is supposed to specify, but all data in the request, including tag attributes, hidden fields, cookies, headers, the URL itself, and so forth. A common mistake that leads to continuing XSS vulnerabilities is to validate only fields that are expected to be redisplayed by the site. We often encounter data from the request that is reflected by the application server or the application that the development team did not anticipate. Also, a field that is not currently reflected may be used by a future developer. Therefore, validating ALL parts of the HTTP request is recommended.
Mitigation MIT-30.1
Implementation
Strategy: Output Encoding
- Use and specify an output encoding that can be handled by the downstream component that is reading the output. Common encodings include ISO-8859-1, UTF-7, and UTF-8. When an encoding is not specified, a downstream component may choose a different encoding, either by assuming a default encoding or automatically inferring which encoding is being used, which can be erroneous. When the encodings are inconsistent, the downstream component might treat some character or byte sequences as special, even if they are not special in the original encoding. Attackers might then be able to exploit this discrepancy and conduct injection attacks; they even might be able to bypass protection mechanisms that assume the original encoding is also being used by the downstream component.
- The problem of inconsistent output encodings often arises in web pages. If an encoding is not specified in an HTTP header, web browsers often guess about which encoding is being used. This can open up the browser to subtle XSS attacks.
Mitigation MIT-43
Implementation
With Struts, write all data from form beans with the bean's filter attribute set to true.
Mitigation MIT-31
Implementation
Strategy: Attack Surface Reduction
To help mitigate XSS attacks against the user's session cookie, set the session cookie to be HttpOnly. In browsers that support the HttpOnly feature (such as more recent versions of Internet Explorer and Firefox), this attribute can prevent the user's session cookie from being accessible to malicious client-side scripts that use document.cookie. This is not a complete solution, since HttpOnly is not supported by all browsers. More importantly, XmlHttpRequest and other powerful browser technologies provide read access to HTTP headers, including the Set-Cookie header in which the HttpOnly flag is set.
CAPEC-199: XSS Using Alternate Syntax
An adversary uses alternate forms of keywords or commands that result in the same action as the primary form but which may not be caught by filters. For example, many keywords are processed in a case insensitive manner. If the site's web filtering algorithm does not convert all tags into a consistent case before the comparison with forbidden keywords it is possible to bypass filters (e.g., incomplete black lists) by using an alternate case structure. For example, the "script" tag using the alternate forms of "Script" or "ScRiPt" may bypass filters where "script" is the only form tested. Other variants using different syntax representations are also possible as well as using pollution meta-characters or entities that are eventually ignored by the rendering engine. The attack can result in the execution of otherwise prohibited functionality.