CVE-2026-87928

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreHIGH confidence

Score 5.4 from GitHub Security Advisory published 2026-09-09. a secondary CVSS source baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

MaxSite CMS versions 0.94 through 109.6 contain a cross-site scripting vulnerability in the admin_page upload handler that allows any logged-in user to upload HTML files. Attackers can upload HTML containing malicious scripts to the uploads/_pages/ directory, which executes in visitors' browsers when the file is accessed, enabling persistent stored cross-site scripting attacks.

CVSS v3
5.4
EG Score
5.4(high)
EG Risk
24(Track)
EG Risk 24/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity54% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
7%
KEV
Not listed

Published

September 9, 2026

Last Modified

September 18, 2026

Advisory Details (4)

Auto-updated Sep 9, 2026
No patch confirmed yet.
generic

MaxSite CMS 0.94 through 109.6 HTML Upload XSS via admin_page | Advisories | VulnCheck

https://www.vulncheck.com/advisories/maxsite-cms-0.94-through-109.6-html-upload-xss-via-admin-page
generic

cms/application/maxsite/admin/plugins/admin_page/uploads-require-maxsite.php at 2ca0a0c7d1d71106a25dbb0f2aedaaefbf12802c · maxsite/cms · GitHub

https://github.com/maxsite/cms/blob/2ca0a0c7d1d71106a25dbb0f2aedaaefbf12802c/application/maxsite/admin/plugins/admin_page/uploads-require-maxsite.php#L1-L64
generic

maxsite-cve2/2026.09.08-maxsite-cms-arbitrary-file-write-stored-xss.md at main · EviL0rd/maxsite-cve2 · GitHub

https://github.com/EviL0rd/maxsite-cve2/blob/main/2026.09.08-maxsite-cms-arbitrary-file-write-stored-xss.md
generic

GitHub - maxsite/cms: MaxSite CMS. Free CMS for your website. Smart alternative to WordPress · GitHub

https://github.com/maxsite/cms

Vendor Advisories for CVE-2026-87928(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 22× in last 7d / 38× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-20 23:00 UTCEG score recompute
  2. 2026-09-20 22:59 UTCGHSA enrichment
  3. 2026-09-20 20:16 UTCEPSS rescore
  4. 2026-09-19 20:45 UTCEG score recompute
  5. 2026-09-19 20:45 UTCGHSA enrichment
  6. 2026-09-18 19:28 UTCEPSS rescore
  7. 2026-09-18 18:33 UTCEG score recompute
  8. 2026-09-18 18:33 UTCGHSA enrichment
  9. 2026-09-18 17:30 UTCEG score recompute
  10. 2026-09-18 17:30 UTCGHSA enrichment
  11. 2026-09-18 14:16 UTCEG score recompute
  12. 2026-09-18 14:16 UTCGHSA enrichment
  13. 2026-09-17 19:32 UTCEPSS rescore
  14. 2026-09-17 11:53 UTCEG score recompute
  15. 2026-09-17 11:53 UTCGHSA enrichment
  16. 2026-09-16 14:09 UTCEPSS rescore
  17. 2026-09-16 09:42 UTCEG score recompute
  18. 2026-09-16 09:42 UTCGHSA enrichment
  19. 2026-09-16 05:15 UTCEPSS rescore
  20. 2026-09-15 07:30 UTCEG score recompute
  21. 2026-09-15 07:30 UTCGHSA enrichment
  22. 2026-09-15 03:12 UTCEPSS rescore
  23. 2026-09-14 05:19 UTCEG score recompute
  24. 2026-09-14 05:19 UTCGHSA enrichment
  25. 2026-09-13 16:48 UTCEPSS rescore
Show 13 more
  1. 2026-09-13 03:08 UTCEG score recompute
  2. 2026-09-13 03:08 UTCGHSA enrichment
  3. 2026-09-12 15:02 UTCEPSS rescore
  4. 2026-09-12 00:56 UTCEG score recompute
  5. 2026-09-12 00:56 UTCGHSA enrichment
  6. 2026-09-11 14:53 UTCEPSS rescore
  7. 2026-09-11 14:53 UTCEPSS rescore
  8. 2026-09-10 22:44 UTCGHSA enrichment
  9. 2026-09-09 20:33 UTCEG score recompute
  10. 2026-09-09 20:32 UTCGHSA enrichment
  11. 2026-09-09 17:28 UTCEG score recompute
  12. 2026-09-09 16:55 UTCEG score recompute
  13. 2026-09-09 16:54 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-87928?
CVE-2026-87928 is a medium vulnerability published on September 9, 2026. MaxSite CMS versions 0.94 through 109.6 contain a cross-site scripting vulnerability in the adminpage upload handler that allows any logged-in user to upload HTML files. Attackers can upload HTML containing malicious scripts to the uploads/pages/ directory, which executes in visitors' browsers when…
When was CVE-2026-87928 disclosed?
CVE-2026-87928 was first published in the National Vulnerability Database on September 9, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-87928 actively exploited?
CVE-2026-87928 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 93.2% of all scored CVEs.
What is the CVSS score of CVE-2026-87928?
CVE-2026-87928 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-87928?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-87928, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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