Security readout for executives and security teams
Plain-English summary
CVE-2021-36879 allows unauthenticated privilege escalation in the WordPress uListing plugin through version 2.0.5 when the site allows user registration. A successful attack could let an outsider gain elevated access, putting site content, user data, and operations at risk.
Executive priority
Prioritize this for same-day review on externally reachable WordPress sites. The issue is critical because it may allow account takeover or administrative access without credentials when registration is enabled.
Technical view
The issue affects StylemixThemes uListing for WordPress versions <= 2.0.5. The CVE describes unauthenticated privilege escalation with CVSS 3.1 score 9.8, network attack vector, low complexity, no privileges, and no user interaction. The provided sources do not include exploit mechanics or a confirmed patched version.
Likely exposure
Exposure is likely limited to WordPress sites running uListing <= 2.0.5 with user registration enabled. Internet-facing WordPress installations should be treated as higher priority because the CVSS vector is network-accessible and unauthenticated.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. It does support high theoretical impact because exploitation requires no authentication or user interaction and can affect confidentiality, integrity, and availability.
Researcher notes
Evidence is strongest for affected product, version range, severity, and registration-dependent exposure. The provided bundle does not include technical root cause details, proof of exploitation, exploit availability, or a named patched version, so validation should avoid assumptions beyond those facts.
Mitigation direction
- Inventory WordPress sites for the uListing plugin and installed version.
- Treat uListing <= 2.0.5 as critically exposed if registration is enabled.
- Check WordPress.org, StylemixThemes, and Patchstack guidance for the supported fixed release.
- Disable public user registration until remediation is confirmed, where operationally possible.
- Disable or remove the plugin if no safe update path is confirmed.
- Review user accounts and administrator changes after the exposure window.
Validation and detection
- Confirm whether uListing is installed on each WordPress site.
- Record the plugin version and whether user registration is enabled.
- Check for unexpected administrator or privileged user accounts.
- Review WordPress logs for suspicious registration or role-change activity.
- Verify remediation against vendor or WordPress plugin guidance.
- Document business owners for any site that cannot be updated immediately.
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-264: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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 lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-36879 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.
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:H3.95.9Primary CVE scoreVulnerability 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
Source materials
- CVE List V5 sourceCVE List V5
- https://wordpress.org/plugins/ulisting/#developersCVE reference · x_refsource_CONFIRM
- https://patchstack.com/database/vulnerability/ulisting/wordpress-ulisting-plugin-2-0-5-unauthenticated-privilege-escalation-vulnerabilityCVE reference · x_refsource_MISC
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.
Permissions, Privileges, and Access Controls
Permissions, Privileges, and Access Controls represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.