Security readout for executives and security teams
Plain-English summary
CVE-2021-39311 affects the link-list-manager WordPress plugin up to version 1.0. A crafted request can reflect script content through the category parameter, but user interaction is required. The main business risk is session abuse or content manipulation if a targeted user follows a malicious link.
Executive priority
Handle in normal vulnerability remediation cycles unless the plugin is internet-facing on high-value WordPress sites. Prioritize removal or upgrade if administrators or authenticated users could be targeted through phishing.
Technical view
The source bundle describes a reflected cross-site scripting flaw in ~/llm.php via the category parameter. CVSS 3.1 is 6.1, with network access, low attack complexity, no privileges, required user interaction, changed scope, and low confidentiality/integrity impact.
Likely exposure
Public WordPress sites using link-list-manager version 1.0 or earlier. Exposure depends on whether the plugin is installed, enabled, and reachable. The source bundle provides no CPEs and does not identify other affected products.
Exploitation context
The bundle does not show CISA KEV listing or active exploitation evidence. Exploitation would require a victim to interact with attacker-controlled content or a crafted link. Treat exploitation status as unconfirmed, not actively exploited.
Researcher notes
Evidence is limited to the CVE description, Wordfence advisory reference, and WordPress Trac source reference. No patch version, exploit-in-the-wild confirmation, or proof-of-concept detail is provided in the bundle.
Mitigation direction
- Inventory WordPress sites for link-list-manager version 1.0 or earlier.
- Check Wordfence, WordPress plugin sources, and vendor guidance for a fixed release.
- If no maintained fixed release exists, disable or remove the plugin.
- Reduce impact with strict session hygiene and least-privileged WordPress accounts.
- Consider WAF or content-security controls as compensating defenses.
Validation and detection
- Confirm whether link-list-manager is installed and enabled on each WordPress site.
- Record the installed plugin version and compare it with affected version 1.0.
- Review whether llm.php and category-driven pages are publicly reachable.
- Use approved staging tests or a scanner to confirm reflected input handling safely.
- Check access logs for unusual requests referencing llm.php or category parameters.
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-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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-2021-39311 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
- Medium
- CVSS
- 6.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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:R/S:C/C:L/I:L/A:N2.82.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.1MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39311CVE reference · x_refsource_MISC
- https://plugins.trac.wordpress.org/browser/link-list-manager/tags/1.0/llm.php#L191CVE 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.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.