CVE Intelligence
Critical Insecure deserialization

CVE-2026-104736 — LearnPress <= 4.4.10 - Unauthenticated PHP Object Injection via 'checkout-email' Parameter

The LearnPress plugin for WordPress is vulnerable to PHP Object Injection in versions up to, and including, 4.4.10 via deserialization of untrusted input from the 'checkout-email' request parameter during the checkout AJAX action. The value is passed through sanitize_text_field(), which does not strip serialized object syntax, then stored in the LearnPress session table and later fed to LP_Helper::maybe_unserialize() → unserialize() (without an allowed_classes restriction) by LP_Session_Handler::get() on subsequent requests. This makes it possible for unauthenticated attackers to inject a PHP Object.

Published Oct 17, 2026 · Updated Oct 17, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: Wordfence

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

Proofs of concept on GitHub · 1
How the score was calculated
  • Public exploit/PoC (github)+6
  • Technical severity (critical)+10

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation
Not confirmed
Not in CISA KEV — an absence of record, not proof it is unexploited.
EPSS FIRST
—
No EPSS score.
Affects
Thimpress
LearnPress – WordPress LMS Plugin for Create and Sell Online Courses
CVSS base
9.8
Critical · 2 source(s)

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

  1. Identify exposed assets running the affected vendor/product/version combinations (Thimpress LearnPress – WordPress LMS Plugin for Create and Sell Online Courses).
  2. The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
  3. No fix documented in the sources: reduce exposure and monitor the vendor advisory.
  4. Search available logs for exploit probes matching the vulnerability class (insecure deserialization), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

VendorProductVersionsStatusSource
Thimpress LearnPress – WordPress LMS Plugin for Create and Sell Online Courses ≤ 4.4.10 Vulnerable CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

ScoreVersionSeverityExpl.ImpactScored by
9.8 CVSS 3.1 Critical 3.9 5.9 security@wordfence.com via NIST National Vulnerability Database
9.8 CVSS 3.1 Critical — — Wordfence via CVE Program (cve.org) e CISA ADP
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H (score shown at the top: security@wordfence.com)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-502 · Deserialization of Untrusted Data

Other CVEs with this weakness →

Public exploits, PoCs and detection templates

Public code that demonstrates or tests the flaw raises the odds of mass exploitation — and Nuclei templates help find vulnerable assets in your environment.

Proofs of concept on GitHub

Warning: public PoCs are sometimes disguised malware. Use them only for authorized testing in an isolated environment. This portal does not host exploit code — it only points to the sources.

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

  • Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
  • Monitor serialized objects in requests and unexpected processes spawned by the runtime.
web/proxy/WAF logsnetwork IDS/IPSendpoint telemetry (EDR)application logs

Timeline

What happened to this CVE, newest first.

  • 2026
  • Affected products added · thimpress/learnpress – wordpress lms plugin for create and sell online courses
    Oct 17, 2026 · CVE Program (cve.org) e CISA ADP
  • Record published
    Oct 17, 2026
  • CVSS changed · 9.8
    Oct 17, 2026 · NIST National Vulnerability Database
  • Source status changed · → Received
    Oct 17, 2026 · NIST National Vulnerability Database
  • Record created in this database
    Oct 17, 2026 · Alertas do Telegram
  • CVE published
    Oct 17, 2026 · Wordfence

Source activity

Repeated readings are counted rather than listed.

  • 1× References added · Oct 17, 2026 – Oct 17, 2026
  • 1× Official description updated · Oct 17, 2026 – Oct 17, 2026

References

6 on the record

Elsewhere on this site

Thimpress
every CVE for this vendor
Insecure deserialization
same class
CWE-502
other pages naming this weakness

Related CVEs (same products)

  • CVE-2026-107744 LearnPress <= 4.4.10 - Missing Authorization to Authenticated (Subscriber+) Email Address Enumeration via 'search-authors' AJAX Action 12h
  • CVE-2026-109208 LearnPress <= 4.4.10 - Unauthenticated Stored Cross-Site Scripting via 'quantity' and 'order_comments' Parameters 13h
  • CVE-2026-92538 LearnPress <= 4.4.7 - Reflected DOM-Based Cross-Site Scripting via 'orderby' Parameter 14d
  • CVE-2026-93882 LearnPress <= 4.4.8 - Insecure Direct Object Reference to Unauthenticated Sensitive Information Disclosure via 'item_id' Parameter 16d
  • CVE-2026-12230 LearnPress <= 4.3.9.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'layout_custom_css' Sep 8, 2026
  • CVE-2026-77823 LearnPress <= 4.4.4 - Authenticated (Administrator+) SQL Injection via 'orderby' Parameter Sep 1, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

  • No FIRST EPSS score.
  • No fixed version, patch or mitigation documented.
  • No CISA SSVC assessment.
  • No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
  • No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
  • No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-104736 is "LearnPress <= 4.4.10 - Unauthenticated PHP Object Injection via 'checkout-email' Parameter", rated Critical. It affects LearnPress – WordPress LMS Plugin for Create and Sell Online Courses (Thimpress); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 9.8 describes technical severity. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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