CVE-2026-8423Network attack vector

Theme change via missing options-page nonce validation

Published May 20, 2026 · Updated May 20, 2026

Cross-site request forgery in JaviBola Custom Theme Test 2.0.5 and earlier allows remote attackers to change a site's active theme. The options-page handler accepts the jbct_theme setting and updates the active-theme option without validating a WordPress nonce. Exploitation requires an authenticated site administrator to submit the forged request, such as by following an attacker-controlled link, and the bounded consequence is an unauthorized theme switch.

CVSS severity4.3
Medium
EPSS probability0.18%
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 JaviBola Custom Theme Test 2.0.5 and earlier allows remote attackers to change a site's active theme. The options-page handler accepts the jbct_theme setting and updates the active-theme option without validating a WordPress nonce. Exploitation requires an authenticated site administrator to submit the forged request, such as by following an attacker-controlled link, and the bounded consequence is an unauthorized theme switch.

The record

CVE
CVE-2026-8423
Published
May 20, 2026
Updated
May 20, 2026
Vendor
JaviBola
Product
JaviBola Custom Theme Test
Classifications
CWE-352, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 20, 2026CVE publishedPublication date reported by the CVE source.
  2. May 20, 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 <=2.0.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

JaviBola · JaviBola Custom Theme Testversion=0 <=2.0.5

Published CVSS scores

4.3INCIBE-CERTCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/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.

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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)
T1204.001User Execution: Malicious Link

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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