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PatchSiren cyber security CVE debrief

CVE-2026-39642 SpabRice CVE debrief

A Cross-Site Scripting (XSS) vulnerability exists in the Nyla WordPress theme, affecting versions up to and including 1.7. The flaw stems from improper neutralization of script-related HTML tags, enabling code injection. The vulnerability was disclosed on 2026-05-26 and carries a CVSS 3.1 score of 5.3 (Medium severity). The NVD entry currently shows a status of 'Deferred'. A Patchstack advisory identifies this as an arbitrary shortcode execution vulnerability in the WordPress Nyla theme. No known exploitation in ransomware campaigns has been reported, and the vulnerability is not listed in CISA's Known Exploited Vulnerabilities (KEV) catalog.

Vendor
SpabRice
Product
Nyla
CVSS
MEDIUM 5.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-26
Original CVE updated
2026-05-26
Advisory published
2026-05-26
Advisory updated
2026-05-26

Who should care

WordPress site administrators using the Nyla theme; security teams managing WordPress installations; web developers maintaining sites with custom shortcode implementations.

Technical summary

The Nyla WordPress theme (versions ≤1.7) contains an improper neutralization vulnerability (CWE-80) that allows injection of script-related HTML tags. The underlying issue appears related to arbitrary shortcode execution, which can lead to code injection in web page contexts. The vulnerability requires no authentication (PR:N) and is exploitable over the network with low attack complexity. Impact is limited to low confidentiality impact (C:L) with no integrity or availability impact per the CVSS vector.

Defensive priority

medium

Recommended defensive actions

  • Review and apply any security updates for the Nyla theme when available from the vendor or Patchstack.
  • Implement Content Security Policy (CSP) headers to mitigate impact of XSS vulnerabilities.
  • Conduct code review of theme files for improper output encoding and shortcode handling.
  • Consider Web Application Firewall (WAF) rules to filter malicious script payloads.
  • Monitor for vendor security advisories regarding Nyla theme updates.

Evidence notes

CVE published 2026-05-26T09:16:20.487Z; modified 2026-05-26T19:31:20.323Z. NVD status: Deferred. CVSS 3.1 vector: AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N. Weakness: CWE-80 (Improper Neutralization of Script-Related HTML Tags in a Web Page).

Sources and references

Verified primary and authoritative sources

  • CVE-2026-39642 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-39642

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-39642 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-39642

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.