Security readout for executives and security teams
Plain-English summary
Flexible Subscriptions versions through 1.8.1 contain a remotely reachable PHP object injection flaw. An unauthenticated attacker may be able to compromise site data, integrity, or availability, although the supplied sources do not establish the exact impact path. WordPress operators using this plugin should treat verification and remediation as urgent.
Executive priority
Treat as an immediate investigation and remediation priority for internet-facing sites. The theoretical impact is critical and requires no authentication according to the CVSS vector. However, exploitation and a fixed version are not confirmed in the supplied evidence, so teams should verify authoritative guidance before declaring systems secure.
Technical view
CVE-2026-73364 is classified as CWE-502 with CVSS 3.1 score 9.8. The vector indicates network access, low complexity, no privileges, and no user interaction. The bundle identifies customer-related PHP object injection in versions through 1.8.1, but provides no affected endpoint, prerequisite gadget chain, proof of concept, or confirmed fixed version.
Likely exposure
Internet-facing WordPress sites running Flexible Subscriptions 1.8.1 or earlier are potentially exposed. The supplied affected-product metadata also states a default status of “unaffected,” conflicting with the title and description. Confirm the installed version and applicability against current vendor or Patchstack guidance.
Exploitation context
The supplied bundle does not report CISA KEV inclusion or active exploitation. No public exploit evidence is provided. The CVSS vector indicates unauthenticated remote reachability, but practical consequences of PHP object injection can depend on available classes or gadget chains, which these sources do not document.
Researcher notes
Evidence is limited to the CVE bundle and Patchstack reference. Important unknowns include the vulnerable input, deserialization path, required object classes, reachable gadget chains, fixed release, and exploitation telemetry. The contradictory “defaultStatus: unaffected” metadata warrants verification. Avoid assuming remote code execution from object injection alone.
Mitigation direction
- Inventory every WordPress site using Flexible Subscriptions and record installed versions.
- Check current vendor or Patchstack guidance for a confirmed fixed release.
- Upgrade only to a version explicitly confirmed as remediating CVE-2026-73364.
- If no fix is available, consider disabling the plugin until authoritative guidance is published.
- Restrict unnecessary public access to affected functionality where operationally feasible.
Validation and detection
- Confirm whether Flexible Subscriptions is installed, active, and version 1.8.1 or earlier.
- Compare findings with current vendor or Patchstack applicability guidance.
- Review web and application logs for unusual customer or subscription requests.
- Verify the plugin is disabled or running a release explicitly confirmed as fixed.
- Retest affected workflows after remediation and monitor for unexpected site behavior.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-502: Code execution behavior lookup
Code execution and unsafe deserialization weaknesses often justify reviewing execution behavior and process telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-73364 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9PatchstackVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Deserialization of Untrusted Data
Deserialization of Untrusted Data represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.