Cyber Resilience

CVE-2026-22455

High

Published: 05 March 2026

Published
05 March 2026
Modified
22 April 2026
KEV Added
—
Patch
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CVSS Score v3.1 7.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
EPSS Score 0.0004 14.4th percentile
Risk Priority 14 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-22455 is a high-severity Cross-site Scripting (CWE-79) vulnerability. Its CVSS base score is 7.1 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 14.4th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-15 (Information Output Filtering).

Deeper analysis

CVE-2026-22455 is an Improper Neutralization of Input During Web Page Generation vulnerability, classified as Reflected Cross-site Scripting (XSS) under CWE-79, in the WordPress theme "Thebe" developed by foreverpinetree. This issue affects Thebe versions from n/a through <=1.3.0. The vulnerability carries a CVSS v3.1 base score of 7.1 (AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L), indicating high severity due to network accessibility, low complexity, and changed scope.

Unauthenticated attackers (PR:N) can exploit this over the network (AV:N) with low attack complexity (AC:L), but it requires user interaction (UI:R), such as clicking a malicious link. Exploitation reflects attacker-controlled input as executable scripts in the victim's browser, enabling limited impacts on confidentiality, integrity, and availability (C:L/I:L/A:L) within the site's context due to scope change (S:C).

The Patchstack advisory at https://patchstack.com/database/Wordpress/Theme/thebe/vulnerability/wordpress-thebe-theme-1-3-0-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve details this reflected XSS in Thebe 1.3.0, recommending updates to versions beyond 1.3.0 for mitigation, as the flaw affects releases through that version.

EU & UK References

Vulnerability details

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in foreverpinetree Thebe thebe allows Reflected XSS.This issue affects Thebe: from n/a through <= 1.3.0.

CWE(s)
CWE-79

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 →
T1204.001 Malicious Link Execution
An adversary may rely upon a user clicking a malicious link in order to gain execution.
attack.mitre.org →
Why these techniques?

Reflected XSS in public-facing WordPress theme enables exploitation of web app (T1190) via crafted malicious link requiring user click (T1204.001).

Confidence: MEDIUM · MITRE ATT&CK Enterprise v18.1

CVEs Like This One

CVE-2025-22765Shared CWE-79
CVE-2024-13885Shared CWE-79
CVE-2025-23645Shared CWE-79
CVE-2025-24017Shared CWE-79
CVE-2025-24544Shared CWE-79
CVE-2025-68037Shared CWE-79
CVE-2025-23725Shared CWE-79
CVE-2025-22357Shared CWE-79
CVE-2026-24955Shared CWE-79
CVE-2025-23834Shared CWE-79

Affected Assets

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation good match
prevent

Directly requires validation and neutralization of untrusted input before it is used in web page generation, blocking the reflected XSS payload in Thebe.

SI-15 Information Output Filtering good match
prevent

Requires filtering or encoding of information sent to users, preventing attacker-supplied scripts from executing in the victim's browser via reflected XSS.

SI-2 Flaw Remediation partial match
prevent

Mandates timely remediation of known flaws such as the improper neutralization present in Thebe versions <=1.3.0.

References