CVE-2023-3672Public exploitNetwork attack vector

Script execution via unescaped Webmention author name

Published Jul 14, 2023 · Updated Oct 22, 2024

DOM-based XSS in PlaidWeb webmention.js before 0.5.5 allows remote attackers to execute script through a crafted Webmention author name. The renderer assigns the unescaped p-name value from c.name to linktext and inserts it into generated markup instead of applying entity encoding. A site must embed the library and display the attacker's Webmention, after which script executes in a visitor's browser under the site's origin.

CVSS severity7.3
High
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

DOM-based XSS in PlaidWeb webmention.js before 0.5.5 allows remote attackers to execute script through a crafted Webmention author name. The renderer assigns the unescaped p-name value from c.name to linktext and inserts it into generated markup instead of applying entity encoding. A site must embed the library and display the attacker's Webmention, after which script executes in a visitor's browser under the site's origin.

The record

CVE
CVE-2023-3672
Published
Jul 14, 2023
Updated
Oct 22, 2024
Vendor
PlaidWeb
Product
webmention.js
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 14, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 22, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <0.5.5
  2. Affected versionversion=unspecified <0.5.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PlaidWeb · webmention.jsversion=0 <0.5.5; version=unspecified <0.5.5

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
7.3huntr.devCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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