CVE-2023-4893Network attack vector

Authenticated SSRF via unrestricted shortcode URL fetching

Published Sep 12, 2023 · Updated Apr 8, 2026

Server-side request forgery in Crayon Syntax Highlighter 2.8.4 and earlier allows remote authenticated users to send arbitrary requests. The crayon shortcode passes an attacker-controlled URL into the plugin's server-side highlighting fetch without restricting internal destinations. Contributor-level WordPress access is required; successful requests can read or modify reachable internal-service data.

CVSS severity6.4
Medium
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side request forgery in Crayon Syntax Highlighter 2.8.4 and earlier allows remote authenticated users to send arbitrary requests. The crayon shortcode passes an attacker-controlled URL into the plugin's server-side highlighting fetch without restricting internal destinations. Contributor-level WordPress access is required; successful requests can read or modify reachable internal-service data.

The record

CVE
CVE-2023-4893
Published
Sep 12, 2023
Updated
Apr 8, 2026
Vendor
Aram Kocharyan
Product
Crayon Syntax Highlighter
Classifications
CWE-918, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 12, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 2026Record 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 <=2.8.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Aram Kocharyan · Crayon Syntax Highlighterversion=0 <=2.8.4

Published CVSS scores

6.4WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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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