Webmention <= 5.6.2 - Unauthenticated Blind Server-Side Request Forgery

MITRE NVD CVE.ORG Print: PDF PDF

Summary

CVECVE-2026-0686
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-02 08:16:27 UTC
Updated2026-04-02 08:16:27 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 7.2 HIGH from [email protected]

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

EPSS: 0.000410000 probability, percentile 0.126140000 (date 2026-04-02)

Problem Types: CWE-918 | CWE-918 CWE-918 Server-Side Request Forgery (SSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
3.1CNADECLARED7.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Pfefferle Webmention affected 5.6.2 semver Not specified

References

ReferenceSourceLinkTags
plugins.trac.wordpress.org/browser/webmention/tags/5.6.2/includes/class-receiver.php [email protected] plugins.trac.wordpress.org
github.com/pfefferle/wordpress-webmention/blob/057223cee18a9e93b017d0f21... [email protected] github.com
plugins.trac.wordpress.org/browser/webmention/tags/5.6.2/includes/handler/class-mf2.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/changeset/3494831/webmention [email protected] plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/08d15c46-d15f-4803-80be-90bf3... [email protected] www.wordfence.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Duong Quang Hao (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-01-07T19:33:54.000ZVendor Notified
CNA2026-04-01T19:17:15.000ZDisclosed
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