Security readout for executives and security teams
Plain-English summary
CVE-2021-38355 is a reflected cross-site scripting issue in the Bug Library WordPress plugin through version 2.0.3. An attacker could trick a user into opening a crafted link that causes script content to run in the victim's browser. Business risk is moderate and mainly affects sites still using this plugin.
Executive priority
Treat as a medium-priority WordPress hygiene issue. It is not currently cited as exploited in the provided evidence, but vulnerable public sites can create user-session and content-integrity risk if the plugin remains deployed.
Technical view
The vulnerability is CWE-79 in ~/bug-library.php, involving the successimportcount parameter. CVSS 3.1 is 6.1 with network access, low complexity, no privileges required, user interaction required, changed scope, low confidentiality and integrity impact, and no availability impact.
Likely exposure
Exposure is limited to WordPress installations running Bug Library up to and including 2.0.3. The source bundle does not identify affected forks, other plugins, hosted services, or a confirmed fixed version.
Exploitation context
The CVE record does not indicate CISA KEV listing, and the provided sources do not state active exploitation. Exploitation requires user interaction, consistent with reflected XSS risk from a crafted request targeting a vulnerable parameter.
Researcher notes
Evidence supports reflected XSS in Bug Library <=2.0.3 via successimportcount. The bundle names Wordfence and WordPress Trac references but does not provide a patch version, exploit-in-the-wild confirmation, or broader product impact.
Mitigation direction
- Inventory WordPress sites for the Bug Library plugin and version.
- Check vendor, WordPress plugin, and Wordfence guidance for a fixed release.
- Upgrade if a vendor-supported fixed version is available.
- Disable or remove the plugin if no supported fix is available.
- Prioritize sites with authenticated users or sensitive administrative workflows.
Validation and detection
- Confirm whether Bug Library is installed and at version 2.0.3 or earlier.
- Review plugin code or release notes for escaping of successimportcount output.
- Check web logs for requests referencing bug-library.php and successimportcount.
- Use approved, non-executing canary input to assess reflection safely.
- Document whether the plugin is required for business operations.
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-2021-38355 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-2021-38355CVE reference · x_refsource_MISC
- https://plugins.trac.wordpress.org/browser/bug-library/trunk/bug-library.php?rev=2571533#L1358CVE 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.