Security readout for executives and security teams
Plain-English summary
A vulnerable WordPress plugin can reflect attacker-supplied script into a page. A victim must be tricked into opening a crafted link. This can expose browser-session data or let an attacker act within the victim’s browser context, but the bundle does not show server takeover or active exploitation.
Executive priority
Treat as a moderate website risk. It is not listed as actively exploited, but public WordPress plugins are commonly scanned. Remediate during normal vulnerability SLAs, faster for externally exposed or administrator-used sites.
Technical view
jQuery Tagline Rotator up to 0.1.5 uses $_SERVER['PHP_SELF'] unsafely in jquery-tagline-rotator.php, creating reflected cross-site scripting. CVSS 3.1 is 6.1: network reachable, low complexity, unauthenticated, user interaction required, changed scope, low confidentiality and integrity impact, no availability impact.
Likely exposure
Exposure is limited to WordPress sites running jQuery Tagline Rotator version 0.1.5 or earlier. The source bundle lists no CPEs and no other affected products.
Exploitation context
The bundle marks KEV as false and provides no evidence of active exploitation. Practical exploitation requires a user to visit an attacker-influenced URL. Business risk is higher where authenticated administrators or trusted users may click external links.
Researcher notes
Evidence is specific to the jQuery Tagline Rotator WordPress plugin and CWE-79. The provided sources identify the unsafe PHP_SELF usage and affected version range, but do not provide exploit status, fixed-version details, or broader product impact.
Mitigation direction
- Inventory WordPress sites for jQuery Tagline Rotator installations.
- Remove or disable the plugin if it is unnecessary.
- Check vendor or Wordfence guidance before assuming a fixed version exists.
- Use WAF or browser protections as temporary compensating controls.
- Prioritize sites with administrator access exposure or high-value users.
Validation and detection
- Confirm plugin presence and version across WordPress assets.
- Check whether version 0.1.5 or earlier is deployed.
- Review the referenced plugin file for unsafe PHP_SELF output.
- Review logs or WAF alerts for reflected XSS probing.
- Verify removal, disablement, or vendor-confirmed 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-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-2021-34663 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-2021-34663CVE reference · x_refsource_MISC
- https://plugins.trac.wordpress.org/browser/jquery-tagline-rotator/trunk/jquery-tagline-rotator.php#L166CVE 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.