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UpdraftPlus WordPress Backup Plugin <= 1.9.50 — Nonce Leak to Authorization Bypass

c75bfba9-b25a-4966-835c-8d22736de809Published · Updated

Action summary

Affected: <1.9.51Update to 1.9.51 or newer

All remediation steps
Watch plugin
Severity
Critical9.9
CVSS
9.9
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
What does this vector mean?
AV:N Attack vector
Network
AC:L Attack complexity
Low
PR:L Privileges required
Low
UI:N User interaction
None
S:C Scope
Changed
C:H Confidentiality
High
I:H Integrity
High
A:H Availability
High
Weakness
CWE-269 Privilege Escalation
Required access
Unknown
Exploit prediction (EPSS)
No score
CISA KEV
Not listed
On this page8

Am I affected?

UpdraftPlus Premium updraftplus

  1. Affected< 1.9.51
  2. Patched in1.9.51

Update to 1.9.51 or newer.

You are affected if you run < 1.9.51. Version 1.9.51 and later are not affected by this issue.

  • Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under UpdraftPlus Premium.
  • No admin access? Run a passive check of your site. It reads public files only.

What to do

  1. Update to version 1.9.51, or a newer patched version
  2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
  3. Watch UpdraftPlus Premium to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to Marc-Alexandre Montpas.

The UpdraftPlus WordPress Backup Plugin for WordPress is vulnerable to nonce leak which leads to authorization bypass in versions up to, and including, 1.9.50. This is due to incorrect use of several 'admin_action_' hooks. This makes it possible for authenticated attackers to arbitrarily upload files, download backups and retrieve secret keys.

Exploits & references

Proof-of-concept & detection

No public proof-of-concept or detection template is known for this vulnerability.

Advisories & patches

More in UpdraftPlus Premium

All 19
More vulnerabilities in UpdraftPlus Premium
SeverityVulnerabilityCVEPublished
Medium4.31.26.7 - Authenticated (Subscriber+) Information Exposure
<2.26.8.26Update to 1.26.8 or 2.26.8.26
CVE-2026-82841
Medium4.3Cross-Site Request Forgery
<1.26.7Update to 1.26.7
CVE-2026-76549
Critical9.8Unauthenticated Authentication Bypass via UpdraftCentral udrpc
≤1.26.4Update to 1.26.5
CVE-2026-10795
Medium6.1Backup/Restore <= 1.24.12 - Reflected Cross-Site Scripting
≤1.24.12Update to 1.25.1
CVE-2025-0215
High8.81.24.11 - Unauthenticated PHP Object Injection
1.23.8 – 1.24.11Update to 1.24.12
CVE-2024-10957

Same weakness (Privilege Escalation)

All Privilege Escalation
Other Privilege Escalation vulnerabilities
SeverityVulnerabilityCVEPublished
High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
EZ SQL Reports Shortcode Widget and DB Backup≤5.25.25Update to 5.26.45
CVE-2026-120688
Critical9.8Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission
Chatterbug Forms – Fast, Flexible WordPress Form Builder≤1.0.2Update to 1.1
CVE-2026-125055
Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
ELEX WordPress HelpDesk & Customer Ticketing System≤3.3.9Update to 3.4.0
CVE-2026-119077
Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce≤5.127.0Update to 5.128.0
CVE-2026-121518

Timeline

  1. CVE published

    Severity critical, CVSS 9.9

  2. Record last updated

Sources & licenses

Vulnerability data
Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
CVSS / CWE
National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
VulnCrest content
Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.

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