WordPress LiteSpeed Cache plugin <= 5.7 - Unauthenticated Site Wide Stored XSS vulnerability
Priority HIGH 69CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · Low
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in LiteSpeed Technologies LiteSpeed Cache allows Stored XSS.This issue affects LiteSpeed Cache: from n/a through 5.7.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.54872 99th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- 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 |
|---|---|---|---|---|---|
| LiteSpeed Technologies | LiteSpeed Cache | up to 5.7 | — | No fix listed | CNA |
- LiteSpeed Cache VendorLiteSpeed Technologies Affected up to 5.7 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:litespeedtech:litespeed_cache:*:*:*:*:*:wordpress:*:* | before 5.7.0.1 | Vulnerable | litespeedtech |
- cpe:2.3:a:litespeedtech:litespeed_cache:*:*:*:*:*:wordpress:*:* Versions before 5.7.0.1 Vulnerable ·litespeedtech
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2023-40000
- 2026-10-03 Alias added: GHSA-fvp6-8p9w-vffq
- 2026-10-06 EPSS moved to the 99th percentile and above
References
More LiteSpeed Technologies vulnerabilities
- TI-2026-35606 LiteSpeed User-End cPanel Plugin before 2.4.5 allows privilege escalation (possibly to… KEVCVSS 4.0CRITICAL 10.0
- TI-2026-39296 LiteSpeed cPanel plugin before 2.4.8 (as distributed in LiteSpeed WHM PlugIn before… KEVCVSS 3.1HIGH 8.5
- TI-2024-29589 WordPress LiteSpeed Cache plugin < 6.5.0.1 - Unauthenticated Account Takeover via Cookie Leak vulnerability CVSS 3.1CRITICAL 9.8
- TI-2024-18601 WordPress LiteSpeed Cache plugin <= 6.3.0.1 - Unauthenticated Privilege Escalation vulnerability CVSS 3.1CRITICAL 9.8
- TI-2022-00030 Authenticated Remote Code Execution in OpenLiteSpeed Web Server CVSS 3.1HIGH 8.8
- TI-2021-22517 LiteSpeed Web Server Enterprise 5.4.11 - Command Injection CVSS 4.0HIGH 8.6
Sources
- CVE-2023-40000 · CVE Program
- CVE-2023-40000 · NVD
- FIRST EPSS
- GHSA-fvp6-8p9w-vffq · GitHub Advisory Database · CC BY 4.0
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