CVE-2026-86777

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH confidence

Score 5.3 from GitHub Security Advisory published 2026-09-09. a secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 5.3Exploit: Elevated riskExposed: 0

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

AlchemyCMS versions before 7.4.16 and 8.x before 8.3.6 fail to authorize access to the GET /api/nodes endpoint, allowing unauthenticated attackers to retrieve all navigation nodes. Attackers can access the endpoint without authentication to disclose restricted page names, URL paths, and internal URLs from all sites and languages.

CVSS v3
5.3
EG Score
5.3(high)
EG Risk
55(Attend)
EG Risk 55/100SSVC: Attend

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
Severity53% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
44%
KEV
Not listed

Published

September 9, 2026

Last Modified

September 10, 2026

Advisory Details (8)

Auto-updated Sep 9, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_release, github.
generic

AlchemyCMS before 7.4.16 and 8.x before 8.3.6 Missing Authorization on GET /api/nodes | Advisories | VulnCheck

https://www.vulncheck.com/advisories/alchemycms-before-7.4.16-and-8-x-before-8.3.6-missing-authorization-on-get-api-nodes
github Patch Available🟡 PoC Available

Unauthenticated navigation-tree disclosure via GET /api/nodes (missing authorization) · Advisory · AlchemyCMS/alchemy_cms · GitHub

https://github.com/AlchemyCMS/alchemy_cms/security/advisories/GHSA-wppq-8h64-w78r
github_release Patch Available

v8.3.6

Patch available: AlchemyCMS/alchemy_cms v8.3.6

https://github.com/AlchemyCMS/alchemy_cms/releases/tag/v8.3.6
github_release Patch Available

v7.4.16

Patch available: AlchemyCMS/alchemy_cms v7.4.16

https://github.com/AlchemyCMS/alchemy_cms/releases/tag/v7.4.16
github_commit Patch Available

commit 9bdb98496d6f (AlchemyCMS/alchemy_cms)

Patch available: AlchemyCMS/alchemy_cms v7.4.16 (contains commit 9bdb98496d6f)

https://github.com/AlchemyCMS/alchemy_cms/commit/9bdb98496d6f17277ed05dd1abc3188f880aa554
github_commit Patch Available

commit 5e2cd16a806c (AlchemyCMS/alchemy_cms)

Patch available: AlchemyCMS/alchemy_cms v8.3.6 (contains commit 5e2cd16a806c)

https://github.com/AlchemyCMS/alchemy_cms/commit/5e2cd16a806c9d2df3eb6e3c889402487e0085b6
generic

alchemy_cms/app/controllers/alchemy/api/nodes_controller.rb at v8.3.5 · AlchemyCMS/alchemy_cms · GitHub

https://github.com/AlchemyCMS/alchemy_cms/blob/v8.3.5/app/controllers/alchemy/api/nodes_controller.rb
generic

GitHub - AlchemyCMS/alchemy_cms: Alchemy is the Open Source Rails CMS framework for the component based web that can be used as classic server side rendered or headless CMS. · GitHub

https://github.com/AlchemyCMS/alchemy_cms

Vendor Advisories for CVE-2026-86777(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 21× in last 7d / 52× 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. 2026-09-25 09:20 UTCEG score recompute
  2. 2026-09-25 09:20 UTCGHSA enrichment
  3. 2026-09-24 14:04 UTCEPSS rescore
  4. 2026-09-24 11:16 UTCEG score recompute
  5. 2026-09-24 11:16 UTCGHSA enrichment
  6. 2026-09-23 17:54 UTCEPSS rescore
  7. 2026-09-23 13:13 UTCEG score recompute
  8. 2026-09-23 13:13 UTCGHSA enrichment
  9. 2026-09-22 16:01 UTCEPSS rescore
  10. 2026-09-22 15:09 UTCEG score recompute
  11. 2026-09-22 15:09 UTCGHSA enrichment
  12. 2026-09-21 21:09 UTCEPSS rescore
  13. 2026-09-21 17:05 UTCEG score recompute
  14. 2026-09-21 17:05 UTCGHSA enrichment
  15. 2026-09-20 20:16 UTCEPSS rescore
  16. 2026-09-20 18:46 UTCGHSA enrichment
  17. 2026-09-19 20:42 UTCEG score recompute
  18. 2026-09-19 20:42 UTCGHSA enrichment
  19. 2026-09-18 22:38 UTCEG score recompute
  20. 2026-09-18 22:38 UTCGHSA enrichment
  21. 2026-09-18 19:28 UTCEPSS rescore
  22. 2026-09-18 00:35 UTCEG score recompute
  23. 2026-09-18 00:35 UTCGHSA enrichment
  24. 2026-09-17 19:32 UTCEPSS rescore
  25. 2026-09-17 02:31 UTCEG score recompute
Show 27 more
  1. 2026-09-17 02:30 UTCGHSA enrichment
  2. 2026-09-16 14:09 UTCEPSS rescore
  3. 2026-09-16 05:15 UTCEPSS rescore
  4. 2026-09-16 04:23 UTCGHSA enrichment
  5. 2026-09-15 06:17 UTCEG score recompute
  6. 2026-09-15 06:17 UTCGHSA enrichment
  7. 2026-09-15 03:12 UTCEPSS rescore
  8. 2026-09-15 03:12 UTCEPSS rescore
  9. 2026-09-14 08:13 UTCEG score recompute
  10. 2026-09-14 08:13 UTCGHSA enrichment
  11. 2026-09-13 10:10 UTCEG score recompute
  12. 2026-09-13 10:10 UTCGHSA enrichment
  13. 2026-09-12 12:06 UTCEG score recompute
  14. 2026-09-12 12:06 UTCGHSA enrichment
  15. 2026-09-11 14:53 UTCEPSS rescore
  16. 2026-09-11 14:53 UTCEPSS rescore
  17. 2026-09-11 14:02 UTCEG score recompute
  18. 2026-09-11 14:02 UTCGHSA enrichment
  19. 2026-09-10 15:58 UTCGHSA enrichment
  20. 2026-09-10 13:33 UTCGHSA enrichment
  21. 2026-09-09 15:29 UTCEG score recompute
  22. 2026-09-09 15:29 UTCGHSA enrichment
  23. 2026-09-09 14:20 UTCEG score recompute
  24. 2026-09-09 14:20 UTCGHSA enrichment
  25. 2026-09-09 10:24 UTCEG score recompute
  26. 2026-09-09 10:15 UTCEG score recompute
  27. 2026-09-09 10:15 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-86777?
CVE-2026-86777 is a medium vulnerability published on September 9, 2026. AlchemyCMS versions before 7.4.16 and 8.x before 8.3.6 fail to authorize access to the GET /api/nodes endpoint, allowing unauthenticated attackers to retrieve all navigation nodes. Attackers can access the endpoint without authentication to disclose restricted page names, URL paths, and internal…
When was CVE-2026-86777 disclosed?
CVE-2026-86777 was first published in the National Vulnerability Database on September 9, 2026, with the most recent update on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-86777 actively exploited?
CVE-2026-86777 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 55.8% of all scored CVEs.
What is the CVSS score of CVE-2026-86777?
CVE-2026-86777 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-86777?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-86777, 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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