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Calculated Fields Form CVE-2026-95529

| EUVDEUVD-2026-85497 HIGH
Cross-site Scripting (XSS) (CWE-79)
2026-09-23 Patchstack GHSA-39g2-2r8q-64g4
7.1
CVSS 3.1 · Vendor: Patchstack
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Craft malicious XSS payload in request
  2. Delivery
    Deliver link to WordPress user
  3. Exploit
    Victim loads reflected unsanitized input
  4. Execution
    Script executes in site origin
  5. Impact
    Steal session or act as victim

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Output encoding, context-aware escaping
MITRE ATT&CK

2 techniques across 2 tactics: Initial Access, Execution

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Exploitation Conditions

Requires the WordPress 'Calculated Fields Form' plugin (vendor codepeople) at version <= 5.5.1.1 to be installed and active. Exploitation is unauthenticated (PR:N) and remote (AV:N) but is LIMITED by required user interaction (UI:R): a victim must click an attacker-crafted link or load an attacker-controlled page that triggers the reflected unsanitized input. Impact is confined to client-side script execution in the site's origin; no server-side code execution or authentication bypass is implied. Higher-value impact depends on a privileged victim (e.g., an authenticated admin) being lured into triggering the payload.

Impact

This is a HIGH-CVSS-but-moderate-real-risk issue. The CVSS 3.1 base score of 7.1 is inflated by the CVSS vector's scope-change (S:C) and the assignment of low impact to all three of C:L/I:L/A:L, a scoring pattern Patchstack routinely applies to reflected XSS. In practice this is client-side script execution constrained by UI:R (the victim must click an attacker-crafted link or visit a malicious page). No EPSS score, no CISA KEV listing, and no public POC are present in the provided data, so there is no evidence of active or automated exploitation - exploitation status is 'no public exploit identified at time of analysis.' The vector's PR:N is credible (the description explicitly says 'Unauthenticated'), but the description does not distinguish reflected vs. stored XSS; the presence of UI:R strongly implies reflected. I assess A:L as generous - XSS rarely impacts availability - so a truer score is closer to 6.1 (A:N). Net: a real but not urgent priority, meaningful mainly on high-traffic sites where an attacker can lure logged-in users or admins.

Exploit ScenarioDerived

An attacker crafts a URL or web page containing a malicious payload that is reflected unsanitized by the Calculated Fields Form plugin and sends it to a victim who visits a WordPress site running version <= 5.5.1.1. When the victim's browser renders the reflected input, attacker-controlled JavaScript executes in the site's origin, enabling session/cookie theft or actions performed as the victim. No public exploit code is identified at time of analysis, and exploitation requires the victim to interact (UI:R).

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
No patch listed yet 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Sep 23, 2026

Reflected cross-site scripting in the WordPress plugin Calculated Fields Form affects all versions up to and including 5.5.1.1 and allows an unauthenticated remote attacker to execute script in the browser of a user who follows a crafted link or loads a malicious page. The assessed impact is confined to client-side execution inside the target site's origin (low confidentiality and integrity impact, with scope change), and the attack relies on victim interaction, so higher-value outcomes require luring a privileged user such as a site administrator. No public exploit code was identified at time of analysis, the issue is not listed in CISA KEV, and the available intelligence does not confirm a fixed release.

RemediationAI

No vendor-released fixed version is identified in the supplied intelligence, so administrators should check the linked Patchstack advisory and the plugin's WordPress.org page for an updated release and upgrade as soon as one is published. Until then, the most direct compensating control is to deactivate and, if unused, delete the Calculated Fields Form plugin; this removes the vulnerable endpoint entirely but sacrifices the form functionality. If the plugin must remain active, deploy a web application firewall or virtual-patching rule that blocks script or event-handler payloads sent to the plugin's endpoints, recognizing that this is a stopgap which can be bypassed with obfuscation and needs tuning to limit false positives. Because exploitation requires user interaction, reducing the attack surface with email and link filtering plus user awareness training lowers the chance an administrator clicks a crafted URL, and enforcing least privilege for WordPress accounts limits the value of any successful session compromise. Keep WordPress core and all other plugins current, and monitor the advisory for a confirmed patched version before treating the issue as closed.

Affected VersionsENISA

Calculated Fields Form n/a ≤5.5.1.1

Affected Packages

euvd calculated_fields_form no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

The flaw is a reflected cross-site scripting issue (CWE-79: improper neutralization of input during web page generation) in the 'Calculated Fields Form' plugin published by codepeople for WordPress. The CPE cpe:2.3:a:codepeople:calculated_fields_form:*:*:*:*:*:*:*:* and the ENISA EUVD entry EUVD-2026-85497 both flag the plugin at versions <= 5.5.1.1, meaning the vulnerable code is plugin-side PHP that echoes a request parameter back into generated HTML without adequate output encoding. The assessed vector is CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N, so the attack is remote and unauthenticated but requires the victim to interact with the payload; the scope change reflects that the vulnerable component (the plugin endpoint) and the impacted component (the user's browser session in the site origin) are different security scopes. There is no server-side code execution or authentication bypass implied; the injected JavaScript runs with the privileges of whatever session the victim holds, which is why luring an authenticated administrator raises the practical risk. The Patchstack report is the primary source in the supplied references, and no proof-of-concept or observed exploitation data is present in the intelligence provided.

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Severity by source

Vendor (Patchstack) PRIMARY 7.1 HIGH
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
vuln.today AI 6.1 MEDIUM

Unauthenticated remote reflected XSS needing victim click (PR:N/UI:R), script runs cross-origin into the site context (S:C, C:L/I:L); XSS does not impair availability so A:N.

3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

Primary rating from Vendor (Patchstack).

CVSS VectorVendor: Patchstack

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
Low

DescriptionCVE.org

Unauthenticated Cross Site Scripting (XSS) in Calculated Fields Form <= 5.5.1.1 versions.

Executive ViewAI

Why It Matters

The Calculated Fields Form WordPress plugin (versions up to 5.5.1.1) is affected by a reflected cross-site scripting vulnerability that could allow attackers to execute malicious scripts in the browsers of site users, including administrators, potentially leading to session hijacking or unauthorized actions. No vendor-released patch identified at time of analysis, and no public exploit identified at time of analysis, but organizations using this plugin should act to mitigate the risk. This issue affects any organization with this plugin installed, and leadership should prioritize protective measures to prevent potential site compromise.

Business Impact: High
Compensating Controls

Disable the Calculated Fields Form plugin if not essential; implement a web application firewall (WAF) with virtual patching rules to block reflected XSS attempts; enforce a Content Security Policy (CSP) to restrict script execution; and educate users, especially administrators, to avoid clicking untrusted links. Monitor vendor channels for a patched version and apply it promptly once released.

Threat Intelligence Overview

EPSS Score
0.2%
Top 93% exploitable
Prevalence
Medium
popular WordPress form-builder/calculator plugin, common but not on most sites
Data Quality
3 sources
Confidence: Low

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 0.2%
Patch available No
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision
Scheduled
Exploitation
None
System Exposure· derived
Open
Automatable
No
Human Impact
High
Technical Impact
Partial

Priority Score

36
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +36
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.

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