CVE-2021-3355
A stored-self XSS exists in LightCMS v1.3.4, allowing an attacker to execute HTML or JavaScript...
A stored-self XSS exists in LightCMS v1.3.4, allowing an attacker to execute HTML or JavaScript code in a vulnerable Title field to /admin/SensitiveWords.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- Required
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
A stored-self XSS exists in LightCMS v1.3.4, allowing an attacker to execute HTML or JavaScript code in a vulnerable Title field to /admin/SensitiveWords.
- Record
CVE-2021-3355- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N - CVSS 2.0
- 3.5 Low
AV:N/AC:M/Au:S/C:N/I:P/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
CVE List No score
A stored-self XSS exists in LightCMS v1.3.4, allowing an attacker to execute HTML or JavaScript code in a vulnerable Title field to /admin/SensitiveWords.
- Record
CVE-2021-3355- Updated
- 2026-11-02
EUVDEUVD-2021-26686 No score
A stored-self XSS exists in LightCMS v1.3.4, allowing an attacker to execute HTML or JavaScript code in a vulnerable Title field to /admin/SensitiveWords.
- Record
EUVD-2021-26686- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-h87g-cj47-crv7 No score
A stored-self XSS exists in LightCMS v1.3.4, allowing an attacker to execute HTML or JavaScript...
A stored-self XSS exists in LightCMS v1.3.4, allowing an attacker to execute HTML or JavaScript code in a vulnerable Title field to /admin/SensitiveWords.
- Record
GHSA-h87g-cj47-crv7- Weakness
- CWE-79
- Updated
- 2026-11-02
OSV
A stored-self XSS exists in LightCMS v1.3.4, allowing an attacker to execute HTML or JavaScript code in a vulnerable Title field to /admin/SensitiveWords.
- Record
CVE-2021-3355- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N - Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| Exploit-DB | LightCMS 1.3.4 - 'exclusive' Stored XSS | 2021-02-26 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, Exploit-DB, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-3355 is a medium vulnerability (CVSS 5.4) in Lightcms Project Lightcms, published February 24, 2021. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 7.25%, the 94th percentile. No source names a fixed version.