Add Sidebar <= 2.0.0 Reflected Cross-Site Scripting
Priority LOW 29CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
The Add Sidebar WordPress plugin is vulnerable to Reflected Cross-Site Scripting via the add parameter in the ~/wp_sidebarMenu.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 2.0.0.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00844 58th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Add Sidebar | Add Sidebar | 2.0.0 – 2.0.0 | — | No fix listed | CNA |
- Add Sidebar VendorAdd Sidebar Affected 2.0.0 – 2.0.0 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:add_sidebar_project:add_sidebar:*:*:*:*:*:wordpress:*:* | up to 2.0.0 | Vulnerable | Add Sidebar Project |
- cpe:2.3:a:add_sidebar_project:add_sidebar:*:*:*:*:*:wordpress:*:* Versions up to 2.0.0 Vulnerable ·Add Sidebar Project
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-34666
- 2026-10-03 Alias added: GHSA-xrm5-74w8-cr3j
References
Sources
- CVE-2021-34666 · CVE Program
- CVE-2021-34666 · NVD
- FIRST EPSS
- GHSA-xrm5-74w8-cr3j · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences