Security readout for executives and security teams
Plain-English summary
This affects the Passster WordPress plugin before 3.5.5.9. A visitor without an account could bypass the plugin’s content protection and view posts that should stay private or password-protected. The main business risk is unauthorized disclosure of confidential website content.
Executive priority
Prioritize remediation where Passster protects sensitive, private, customer, paid, or regulated content. The issue is high severity because exploitation requires no login or user interaction and can expose confidential information.
Technical view
The vulnerability is an authentication/authorization failure in Passster. Sources say the plugin failed to properly verify the password and whether the requested post was public, allowing unauthenticated arbitrary post access through a crafted request. CVSS 3.1 is 7.5 with high confidentiality impact.
Likely exposure
Exposure is limited to WordPress sites running Passster versions before 3.5.5.9, especially where the plugin protects private posts, paid content, client materials, or internal information. The bundle’s affected-product metadata is sparse, so confirm exposure by checking installed plugin versions directly.
Exploitation context
The WPScan reference is tagged as containing exploit information, but the supplied sources do not state active exploitation. CISA KEV status is false in the bundle. Treat this as publicly documented and potentially testable, not confirmed as exploited in the wild.
Researcher notes
Mapped CWE is CWE-287. The core failure is missing or insufficient authentication checks around password validation and post visibility. Evidence supports confidentiality impact only; integrity and availability impacts are not described in the supplied bundle.
Mitigation direction
- Upgrade Passster to version 3.5.5.9 or later.
- Check vendor guidance for any additional hardening or cleanup instructions.
- Temporarily restrict access to sensitive protected content if upgrade timing is delayed.
- Review whether private or paid content was exposed before remediation.
Validation and detection
- Inventory WordPress sites using the Passster plugin.
- Confirm each installed Passster version is 3.5.5.9 or later.
- Review access logs for unusual unauthenticated requests to protected or private posts.
- Verify protected content cannot be accessed anonymously after remediation.
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-287: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. 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 lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-24881 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
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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:N/A:N3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://wpscan.com/vulnerability/0967303d-ea49-4993-84eb-a7ec97240071CVE reference · exploit, vdb-entry
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.
Improper Authentication
Improper Authentication represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.