CVE-2020-17451 json
flatCore before 1.5.7 allows XSS by an admin via the acp/acp.php?tn=pages&sub=edit&editpage=1 page_linkname, page_title, page_content, or p…
published 2020-08-09 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-9403
- cvss
- 4.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 49%
- public exploits
- 0
- none known
Summary
flatCore before 1.5.7 allows XSS by an admin via the acp/acp.php?tn=pages&sub=edit&editpage=1 page_linkname, page_title, page_content, or page_extracontent parameter, or the acp/acp.php?tn=system&sub=sys_pref prefs_pagename, prefs_pagetitle, or prefs_pagesubtitle parameter.
Patch / fix
- flatcore flatcore 1.5.7
Exploit prediction
0.61% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- lists.openwall.net https://lists.openwall.net/full-disclosure/2020/08/07/1 referenced PoC, tagged "exploit" by a source, unverified
- sec-consult.com https://sec-consult.com/en/blog/advisories/multiple-vulnerabilities-in-flatcore-cms/ referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 4.8 | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 3.5 | AV:N/AC:M/Au:S/C:N/I:P/A:N |
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
lists.openwall.net
/full-disclosure/2020/08/07/1
exploit, mailing-list, third-party-advisory
-
sec-consult.com
/en/blog/advisories/multiple-vulnerabilities-in-flatcore-cms/
exploit, third-party-advisory
Sources
- CVE List CVE-2020-17451
- NVD CVE-2020-17451
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.