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4 vulnerabilities found for Webmention by pfefferle
CVE-2026-111109 (GCVE-0-2026-111109)
Vulnerability from cvelistv5 – Published: 2026-10-31 06:44 – Updated: 2026-11-01 17:44
VLAI
EPSS
VEX
Title
Webmention <= 5.10.1 - Unauthenticated Stored Cross-Site Scripting via Open Graph og:title Meta Tag
Summary
The Webmention plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Open Graph og:title meta tag of a webmention source URL in versions up to, and including, 5.10.1. This is due to insufficient input sanitization: Meta::add_properties() maps og:title to the Item::name property, but Item has no concrete set_name() method, so Item::__call() stores the value raw while sibling set_content()/set_summary() paths route through webmention_sanitize_html(); Item::get_content() then falls back to the raw name when content and summary are empty, and Receiver::process() explicitly removes the core wp_filter_kses / wp_filter_post_kses hooks on pre_comment_content before calling wp_new_comment(), so the payload is persisted to comment_content as-is. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page, after an administrator approves the resulting pending webmention comment. Successful exploitation additionally requires an action by an administrator — the attacker cannot trigger the vulnerability on their own.
Severity
6.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-01 17:34 UTC
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation
Assigner
Wordfence
CNA
References
8 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| pfefferle | Webmention |
Affected:
0 , ≤ 5.10.1
(semver)
|
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{
"url": "https://plugins.trac.wordpress.org/browser/webmention/tags/5.10.1/includes/entity/class-item.php#L297"
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CVE-2026-10513 (GCVE-0-2026-10513)
Vulnerability from cvelistv5 – Published: 2026-06-30 18:32 – Updated: 2026-07-01 10:32
VLAI
EPSS
VEX
Title
Webmention <= 5.8.0 - Unauthenticated Stored Cross-Site Scripting via MF2 'photo'/'url' Author Properties
Summary
The Webmention plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to and including 5.8.0 via parser-derived 'avatar' and 'url' author metadata. This is due to insufficient input sanitization and output escaping on user-supplied MF2 author properties processed by the unauthenticated webmention REST endpoint and rendered directly into HTML 'value' attributes by the edit-comment-form template without esc_attr() or esc_url(). This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a privileged user (moderator or administrator) opens the affected comment edit screen.
Severity
7.2 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-01 10:28 UTC
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
Wordfence
CNA
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| pfefferle | Webmention |
Affected:
0 , ≤ 5.8.0
(semver)
|
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CVE-2026-0686 (GCVE-0-2026-0686)
Vulnerability from cvelistv5 – Published: 2026-04-02 07:39 – Updated: 2026-04-08 16:34
VLAI
EPSS
VEX
Title
Webmention <= 5.6.2 - Unauthenticated Blind Server-Side Request Forgery
Summary
The Webmention plugin for WordPress is vulnerable to Server-Side Request Forgery in all versions up to, and including, 5.6.2 in the 'MF2::parse_authorpage' function via the 'Receiver::post' function. This makes it possible for unauthenticated attackers to make web requests to arbitrary locations originating from the web application and can be used to query and modify information from internal services.
Severity
7.2 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-02 13:44 UTC
CWE
- CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
Wordfence
CNA
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| pfefferle | Webmention |
Affected:
0 , ≤ 5.6.2
(semver)
|
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CVE-2026-0688 (GCVE-0-2026-0688)
Vulnerability from cvelistv5 – Published: 2026-04-02 07:39 – Updated: 2026-04-08 16:32
VLAI
EPSS
VEX
Title
Webmention <= 5.6.2 - Authenticated (Subscriber+) Server-Side Request Forgery
Summary
The Webmention plugin for WordPress is vulnerable to Server-Side Request Forgery in all versions up to, and including, 5.6.2 via the 'Tools::read' function. This makes it possible for authenticated attackers, with Subscriber-level access and above, to make web requests to arbitrary locations originating from the web application and can be used to query and modify information from internal services.
Severity
6.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-02 13:23 UTC
CWE
- CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
Wordfence
CNA
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| pfefferle | Webmention |
Affected:
0 , ≤ 5.6.2
(semver)
|
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