CVE-2021-34631Network attack vector

Stored XSS via CSRF in handle_save_style

Published Aug 5, 2021 · Updated Sep 17, 2024

Cross-Site Request Forgery in NewsPlugin 1.0.18 and earlier allows remote attackers to inject arbitrary web scripts via a crafted request. The handle_save_style function in ~/news-plugin.php accepts a cross-site request without a CSRF token and stores attacker-controlled script content in plugin styling data. A logged-in WordPress user must load the attacker-controlled page, after which stored script executes in visitors' browsers and can alter page content or access data available to that browser session.

CVSS severity8.8
High
EPSS probability0.56%
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 NewsPlugin 1.0.18 and earlier allows remote attackers to inject arbitrary web scripts via a crafted request. The handle_save_style function in ~/news-plugin.php accepts a cross-site request without a CSRF token and stores attacker-controlled script content in plugin styling data. A logged-in WordPress user must load the attacker-controlled page, after which stored script executes in visitors' browsers and can alter page content or access data available to that browser session.

The record

CVE
CVE-2021-34631
Published
Aug 5, 2021
Updated
Sep 17, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-352
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 5, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
8.8WordfenceCVSS: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-352Cross-Site Request Forgery

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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