VulnSocial

CVE-2026-13439Disclosure

LOWCVSS 9.8 · CRITICAL

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Patch affected systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

The Easy Form Builder by WhiteStudio plugin for WordPress is vulnerable to Unauthenticated Privilege Escalation to Administrator in versions up to, and including, 4.0.11 This is due to the password recovery flow using the publicly-visible session identifier ('sid') as the password reset token stored in wp_emsfb_temp_links, combined with a publicly-accessible nonce refresh endpoint (Emsfb/v1/nonce/refresh) that issues valid WordPress REST nonces to unauthenticated visitors. This makes it possible for unauthenticated attackers to reset the password of any WordPress user — including administrators — by scraping the public sid from a published login form page, submitting a recovery request for any known user email via Emsfb/v1/forms/message/add, and then calling Emsfb/v1/forms/recovery/efb_set_password with the known sid to set an arbitrary new password and gain full administrator access.

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0.5/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-269

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Threat summary

  • Patch or workaround signal is available
  • 3 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 3 signals
  • Disclosure: 2 classified signals
  • Peaked 1d ago at 2 mentions (2026-07-21); latest day: 1
  • 3 total mentions across 2 days

Deep dive

Activity timeline3 mentions / 2d
01122Mentions · 2026-07-21: 2Mentions · 2026-07-22: 1Patch / Workaround · 2026-07-21: 1Technical Details · 2026-07-21: 2Technical Details · 2026-07-22: 107-2107-22
Signal classification2 categories
Disclosure
266.7%
Patch
133.3%
Referenced assets3 URLs
Classification over time
DateTotalLabels
2026-07-212
Disclosure1Patch1
2026-07-221
Disclosure1
Full discourse3 posts
  • National CERT/CC@CERT_UG
    Disclosure

    #PatchAlert: Easy Form Builder by WhiteStudio WordPress Plugin Allows Unauthenticated Full Administrator Takeover (CVE-2026-13439)- https://cert.ug/easy-form-builder-whitestudio-wordpress-plugin-allows-unauthenticated-full-administrator-takeover #WordPress

    Post summary

    The tweet alerts readers to CVE-2026-13439, a vulnerability in the Easy Form Builder WordPress plugin that permits unauthenticated full administrator takeover, without providing a patch or exploit details.

    01010145
    1.4K followersView on X
  • Orizon@OrizonCyber
    Patch

    🚨 CVE-2026-13439 — CVSS 9.8/10 ██████████ The Easy Form Builder by WhiteStudio plugin for WordPress is vulnerable to Unauthenticated Privilege Escalation to... Severity: CRITICAL Patch now. #cybersecurity #CVE https://t.co/PWMnbzF5zY

    Post summary

    The tweet highlights a critical privilege escalation vulnerability (CVE-2026-13439) in the Easy Form Builder WordPress plugin and urges users to apply the available patch.

    1000066
    69 followersView on X
  • Vulmon Vulnerability Feed@VulmonFeeds
    Disclosure

    CVE-2026-13439 Unauthenticated Privilege Escalation to Administrator in Easy For... https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-13439 Customizable Vulnerability Alerts: https://alerts.vulmon.com/?utm_source=twitter&utm_medium=social&utm_campaign=2102281&utm_content=4

    Post summary

    The tweet announces CVE‑2026‑13439 as an unauthenticated privilege‑escalation flaw in Easy For, without offering PoC, exploit code, patch details, or claims of active exploitation.

    0000099
    4.1K followersView on X

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