Security readout for executives and security teams
Plain-English summary
A critical flaw in Ultimate Maps by Supsystic may let an unauthenticated internet user submit unsafe PHP object data. The supplied record rates potential confidentiality, integrity, and availability impact as high. WordPress sites using plugin versions before 1.5.0 should be investigated urgently, although the bundle does not establish active exploitation or provide complete vendor remediation details.
Executive priority
Treat as an immediate inventory and remediation priority for internet-facing WordPress systems. The severity and unauthenticated network vector justify urgent action, but do not represent confirmed compromise. Escalate any vulnerable exposed installation or suspicious activity to incident response while validating the vendor-supported remediation.
Technical view
CVE-2026-73376 is classified as CWE-502, deserialization of untrusted data, in Ultimate Maps by Supsystic before 1.5.0. CVSS 3.1 is 9.8: network-accessible, low complexity, no privileges or user interaction, unchanged scope, and high impact across confidentiality, integrity, and availability. The supplied evidence does not describe the vulnerable endpoint, object chain, prerequisites, or demonstrated outcomes.
Likely exposure
Potentially exposed installations are WordPress sites running Ultimate Maps by Supsystic earlier than 1.5.0, particularly publicly reachable sites. Inventory evidence is essential because the structured affected-version entry says “n/a” and defaults to unaffected, conflicting with the title and description. The bundle provides no affected configuration details.
Exploitation context
The source bundle marks this CVE as absent from KEV and provides no cited evidence of active exploitation or public exploit availability. Its unauthenticated, network-accessible rating makes exposed vulnerable sites attractive targets, but practical exploitation conditions are undocumented. PHP object injection impact can depend on available application classes and object behaviors.
Researcher notes
The supplied metadata is incomplete and internally inconsistent: narrative fields identify versions before 1.5.0, while the affected array lists “n/a” and defaults to unaffected. No vulnerable endpoint, sanitization failure, serialized input path, gadget chain, patch commit, vendor advisory, or exploitation telemetry is included. Avoid asserting code execution or a definitive fixed release without additional evidence.
Mitigation direction
- Identify every WordPress installation using Ultimate Maps by Supsystic and record its installed version.
- Prioritize sites running versions earlier than 1.5.0 or installations whose version cannot be confirmed.
- Check current vendor and Patchstack guidance for a confirmed fixed release, then update through approved change controls.
- If no confirmed fix is available, disable or remove the plugin where business impact permits.
- Restrict public exposure and increase monitoring until remediation is verified.
Validation and detection
- Confirm the plugin package slug is ultimate-maps-by-supsystic and capture its exact version.
- Verify upgraded or disabled status across production, staging, backups, images, and deployment manifests.
- Review web, WordPress, and security logs for unusual unauthenticated requests involving the plugin.
- Check file integrity, administrator accounts, scheduled tasks, and unexpected configuration changes on exposed sites.
- Reconfirm the fixed-version boundary against current vendor or Patchstack guidance.
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-2026-73376 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.