CVE-2026-56721

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-11. the CNA's CVSS baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Trending — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

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

CamaleonCMS version 2.9.2 and earlier contains a privilege escalation vulnerability via insecure direct object reference (IDOR) that allows authenticated low-privileged attackers to overwrite any user's credentials by exploiting a parameter confusion flaw between the authorization filter and action body in the UsersController. Attackers can send a PATCH request to the updated_ajax endpoint setting params[:id] to their own user ID to pass the self-authorization check while simultaneously setting params[:user_id] to a victim's ID, causing the controller to load and mutate the victim's account, including overwriting administrator passwords to achieve full site takeover.

CVSS v3
8.8
EG Score
8.8(high)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity88% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
29%
KEV
Not listed

Published

August 11, 2026

Last Modified

August 14, 2026

Advisory Details (4)

Auto-updated Aug 11, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit, github_pr.
generic

CamaleonCMS 2.9.2 Privilege Escalation via Parameter Confusion in UsersController | Advisories | VulnCheck

https://www.vulncheck.com/advisories/camaleoncms-privilege-escalation-via-parameter-confusion-in-userscontroller
github_commit

commit 26345034523a (owen2345/camaleon-cms)

Fix landed in owen2345/camaleon-cms commit 26345034523a — awaiting tagged release

https://github.com/owen2345/camaleon-cms/commit/26345034523a505cb01615509b7f0a665e89ae3e
github_pr

Security: Prevent account takeover via users#updated_ajax by unifying target-user lookup and authorization

Fix merged in owen2345/camaleon-cms PR #1185 on 2026-06-01 — awaiting tagged release

https://github.com/owen2345/camaleon-cms/pull/1185
generic

GitHub - owen2345/camaleon-cms: Camaleon CMS is a dynamic and advanced content management system based on Ruby on Rails · GitHub

https://github.com/owen2345/camaleon-cms

Vendor Advisories for CVE-2026-56721(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 28× in last 7d / 39× 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. 2026-08-20 07:49 UTCGHSA enrichment
  2. 2026-08-19 18:41 UTCEG score recompute
  3. 2026-08-19 18:41 UTCGHSA enrichment
  4. 2026-08-19 17:04 UTCEPSS rescore
  5. 2026-08-19 04:26 UTCGHSA enrichment
  6. 2026-08-18 15:16 UTCEG score recompute
  7. 2026-08-18 15:16 UTCGHSA enrichment
  8. 2026-08-18 13:48 UTCEPSS rescore
  9. 2026-08-18 00:35 UTCEG score recompute
  10. 2026-08-18 00:35 UTCGHSA enrichment
  11. 2026-08-17 13:47 UTCEPSS rescore
  12. 2026-08-17 11:23 UTCGHSA enrichment
  13. 2026-08-16 22:15 UTCEG score recompute
  14. 2026-08-16 22:15 UTCGHSA enrichment
  15. 2026-08-16 14:56 UTCEPSS rescore
  16. 2026-08-16 09:06 UTCEG score recompute
  17. 2026-08-16 09:06 UTCGHSA enrichment
  18. 2026-08-16 02:14 UTCEPSS rescore
  19. 2026-08-15 19:58 UTCGHSA enrichment
  20. 2026-08-15 06:50 UTCEG score recompute
  21. 2026-08-15 06:50 UTCGHSA enrichment
  22. 2026-08-15 01:30 UTCEPSS rescore
  23. 2026-08-14 17:10 UTCEG score recompute
  24. 2026-08-14 17:10 UTCGHSA enrichment
  25. 2026-08-14 12:20 UTCGHSA enrichment
Show 14 more
  1. 2026-08-13 23:12 UTCEG score recompute
  2. 2026-08-13 23:12 UTCGHSA enrichment
  3. 2026-08-13 22:00 UTCEPSS rescore
  4. 2026-08-13 10:04 UTCGHSA enrichment
  5. 2026-08-12 20:55 UTCEG score recompute
  6. 2026-08-12 20:55 UTCGHSA enrichment
  7. 2026-08-12 13:51 UTCEPSS rescore
  8. 2026-08-12 07:47 UTCGHSA enrichment
  9. 2026-08-11 18:39 UTCEG score recompute
  10. 2026-08-11 18:39 UTCGHSA enrichment
  11. 2026-08-11 18:13 UTCEG score recompute
  12. 2026-08-11 16:36 UTCEG score recompute
  13. 2026-08-11 16:06 UTCEG score recompute
  14. 2026-08-11 16:06 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-56721?
CVE-2026-56721 is a high vulnerability published on August 11, 2026. CamaleonCMS version 2.9.2 and earlier contains a privilege escalation vulnerability via insecure direct object reference (IDOR) that allows authenticated low-privileged attackers to overwrite any user's credentials by exploiting a parameter confusion flaw between the authorization filter and action…
When was CVE-2026-56721 disclosed?
CVE-2026-56721 was first published in the National Vulnerability Database on August 11, 2026, with the most recent update on August 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56721 actively exploited?
CVE-2026-56721 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 70.7% of all scored CVEs.
What is the CVSS score of CVE-2026-56721?
CVE-2026-56721 has a CVSS v4.0 base score of 8.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-56721?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56721, 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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