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CVE-2021-3355
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…
Medium5.4EPSS 7.2%
- Published
- Updated
- Reserved
- Assigned by
- mitre
Description
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.
Timeline
ID reserved
By mitre
- 23 days later
· 23 days later
Published
- 3 years later
· 3 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
- EPSS (exploitation in 30 days)
- 7.2% · top 5.6% of all CVEs (7 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.4.
Weakness
Affected products
n/a
- affected n/a
References (4)
- https://github.com/eddy8/LightCMS/issues/18 (opens in a new tab)x_refsource_MISCx_transferred
- http://packetstormsecurity.com/files/161562/LightCMS-1.3.4-Cross-Site-Scripting.html (opens in a new tab)x_refsource_MISCx_transferred
- https://gist.github.com/Peithon/1c628ded0c4fc96c6331c3cce1d0c69b (opens in a new tab)x_refsource_MISCx_transferred
- https://www.exploit-db.com/exploits/49598 (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2021-3355)Record last updated .