CVE-2023-52431Network attack vector

CSRF bypass via accepted empty token pair

Published Feb 13, 2024 · Updated Apr 24, 2025

CSRF bypass in Plack::Middleware::XSRFBlock before 0.0.19 allows remote attackers to submit state-changing requests through a victim browser. The detect_xsrf routine treats an empty form token and an empty cookie as matching values instead of rejecting the missing token pair. Exploitation requires user interaction and an application configured without signed cookies; resulting actions are limited to those the victim is authorized to perform.

CVSS severity8.8
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CSRF bypass in Plack::Middleware::XSRFBlock before 0.0.19 allows remote attackers to submit state-changing requests through a victim browser. The detect_xsrf routine treats an empty form token and an empty cookie as matching values instead of rejecting the missing token pair. Exploitation requires user interaction and an application configured without signed cookies; resulting actions are limited to those the victim is authorized to perform.

The record

CVE
CVE-2023-52431
Published
Feb 13, 2024
Updated
Apr 24, 2025
Vendor
Plack Middleware
Product
Plack::Middleware::XSRFBlock
Classifications
CWE-269, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 13, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 2025Record 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 <0.0.19

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Plack Middleware · Plack::Middleware::XSRFBlockversion=0 <0.0.19

Published CVSS scores

8.8CISA ADP VulnrichmentCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-269Improper Privilege Management
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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