CVE-2025-39435Network attack vector

Stored XSS via cross-site request forgery

Published Apr 17, 2025 · Updated May 12, 2026

Cross-site request forgery in the Marginalia WordPress plugin 1.0.6 and earlier allows remote attackers to store script through crafted requests. Neither Patchstack nor the upstream repository identifies the affected request handler, state-changing operation, or missing verification check. Exploitation requires a victim to submit an attacker-controlled request; the resulting stored script executes when affected content is rendered.

CVSS severity7.1
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site request forgery in the Marginalia WordPress plugin 1.0.6 and earlier allows remote attackers to store script through crafted requests. Neither Patchstack nor the upstream repository identifies the affected request handler, state-changing operation, or missing verification check. Exploitation requires a victim to submit an attacker-controlled request; the resulting stored script executes when affected content is rendered.

The record

CVE
CVE-2025-39435
Published
Apr 17, 2025
Updated
May 12, 2026
Vendor
David F. Carr
Product
My Marginalia
Classifications
CWE-352, CAPEC-592
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 17, 2025CVE publishedPublication date reported by the CVE source.
  2. May 12, 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 <=1.0.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

David F. Carr · My Marginaliaversion=0 <=1.0.6

Published CVSS scores

7.1PatchstackCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/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 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-352Cross-Site Request Forgery (CSRF)
CAPEC-592Stored XSS

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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