CVE-2025-26873

CriticalRCE

Published: 27 March 2025

Published

27 March 2025

Modified

23 April 2026

KEV Added

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Patch

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CVSS Score v3.1 9.0 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS Score 0.0039 60.5th percentile

Risk Priority 18 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-26873 is a critical-severity Deserialization of Untrusted Data (CWE-502) vulnerability. Its CVSS base score is 9.0 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 39.5% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 RA-5 (Vulnerability Monitoring and Scanning) and SI-10 (Information Input Validation).

Deeper analysis

CVE-2025-26873 is a Deserialization of Untrusted Data vulnerability (CWE-502) in the shinetheme Traveler WordPress theme. This issue affects Traveler versions from n/a through those prior to 3.2.1.

The vulnerability carries a CVSS v3.1 base score of 9.0 (AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H). Unauthenticated remote attackers can exploit it over the network with high attack complexity and no user interaction. Successful exploitation enables high impacts on confidentiality, integrity, and availability across a changed scope.

The Patchstack advisory at https://patchstack.com/database/Wordpress/Theme/traveler/vulnerability/wordpress-traveler-theme-3-1-8-php-object-injection-vulnerability?_s_id=cve details the PHP object injection vulnerability and indicates that updating to Traveler version 3.2.1 or later mitigates the issue.

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2025-8520

Vulnerability details

Deserialization of Untrusted Data vulnerability in shinetheme Traveler traveler.This issue affects Traveler: from n/a through < 3.2.1.

CWE(s): CWE-502

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

Why these techniques?

The PHP object injection (deserialization of untrusted data) vulnerability in a public-facing WordPress theme allows unauthenticated remote attackers to exploit the application over the network, directly mapping to T1190 Exploit Public-Facing Application.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0