CVE-2026-56721

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-11. A secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 8.8Exploit: None knownExposed services: Not assessed

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

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
8.8HIGHmedium confidence
EG Risk
40
EG Risk 40/100CISA SSVC

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%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines until it ships, then apply the release.
EPSS PROB
0.5%
EPSS %ILE
42nd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines until it ships, then apply the release.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 11, 2026

Last Modified

August 31, 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 22× in last 7d / 93× 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.

Showing the most recent 100 of 188 total refreshes for this CVE.

  1. 2026-10-05 18:00 UTCEG score recompute
  2. 2026-10-05 18:00 UTCGHSA enrichment
  3. 2026-10-05 17:43 UTCEPSS rescore
  4. 2026-10-04 23:22 UTCEPSS rescore
  5. 2026-10-04 23:20 UTCGHSA enrichment
  6. 2026-10-04 10:11 UTCGHSA enrichment
  7. 2026-10-03 21:00 UTCEG score recompute
  8. 2026-10-03 21:00 UTCGHSA enrichment
  9. 2026-10-03 14:26 UTCEPSS rescore
  10. 2026-10-02 22:25 UTCEG score recompute
  11. 2026-10-02 22:25 UTCGHSA enrichment
  12. 2026-10-02 17:56 UTCEPSS rescore
  13. 2026-10-02 08:43 UTCEG score recompute
  14. 2026-10-02 08:43 UTCGHSA enrichment
  15. 2026-10-01 19:50 UTCEPSS rescore
  16. 2026-10-01 11:25 UTCGHSA enrichment
  17. 2026-09-30 22:17 UTCEG score recompute
  18. 2026-09-30 22:17 UTCGHSA enrichment
  19. 2026-09-30 15:03 UTCEPSS rescore
  20. 2026-09-29 15:22 UTCEPSS rescore
  21. 2026-09-29 05:14 UTCEG score recompute
  22. 2026-09-29 05:14 UTCGHSA enrichment
  23. 2026-09-28 13:51 UTCEPSS rescore
  24. 2026-09-28 02:18 UTCEG score recompute
  25. 2026-09-28 02:18 UTCGHSA enrichment
Show 75 more
  1. 2026-09-27 13:48 UTCEPSS rescore
  2. 2026-09-27 10:14 UTCEG score recompute
  3. 2026-09-27 10:14 UTCGHSA enrichment
  4. 2026-09-26 15:59 UTCEPSS rescore
  5. 2026-09-25 03:55 UTCEG score recompute
  6. 2026-09-25 03:55 UTCGHSA enrichment
  7. 2026-09-24 14:04 UTCEPSS rescore
  8. 2026-09-24 02:25 UTCEG score recompute
  9. 2026-09-24 02:25 UTCGHSA enrichment
  10. 2026-09-23 17:54 UTCEPSS rescore
  11. 2026-09-23 13:16 UTCGHSA enrichment
  12. 2026-09-22 23:52 UTCEG score recompute
  13. 2026-09-22 23:52 UTCGHSA enrichment
  14. 2026-09-22 10:20 UTCGHSA enrichment
  15. 2026-09-21 21:11 UTCEG score recompute
  16. 2026-09-21 21:11 UTCGHSA enrichment
  17. 2026-09-21 00:52 UTCEG score recompute
  18. 2026-09-21 00:52 UTCGHSA enrichment
  19. 2026-09-20 20:16 UTCEPSS rescore
  20. 2026-09-20 10:25 UTCGHSA enrichment
  21. 2026-09-19 19:51 UTCEG score recompute
  22. 2026-09-19 19:50 UTCGHSA enrichment
  23. 2026-09-19 06:22 UTCEG score recompute
  24. 2026-09-19 06:22 UTCGHSA enrichment
  25. 2026-09-18 19:28 UTCEPSS rescore
  26. 2026-09-18 17:13 UTCGHSA enrichment
  27. 2026-09-18 03:04 UTCEG score recompute
  28. 2026-09-18 03:04 UTCGHSA enrichment
  29. 2026-09-17 19:31 UTCEPSS rescore
  30. 2026-09-17 13:56 UTCGHSA enrichment
  31. 2026-09-17 00:33 UTCEG score recompute
  32. 2026-09-17 00:33 UTCGHSA enrichment
  33. 2026-09-16 14:08 UTCEPSS rescore
  34. 2026-09-16 05:15 UTCEPSS rescore
  35. 2026-09-16 02:32 UTCGHSA enrichment
  36. 2026-09-15 13:24 UTCEG score recompute
  37. 2026-09-15 13:24 UTCGHSA enrichment
  38. 2026-09-15 03:11 UTCEPSS rescore
  39. 2026-09-14 22:42 UTCGHSA enrichment
  40. 2026-09-14 07:51 UTCGHSA enrichment
  41. 2026-09-13 18:43 UTCEG score recompute
  42. 2026-09-13 18:43 UTCGHSA enrichment
  43. 2026-09-13 16:47 UTCEPSS rescore
  44. 2026-09-13 05:34 UTCGHSA enrichment
  45. 2026-09-12 16:26 UTCEG score recompute
  46. 2026-09-12 16:26 UTCGHSA enrichment
  47. 2026-09-12 03:14 UTCEG score recompute
  48. 2026-09-12 03:14 UTCGHSA enrichment
  49. 2026-09-11 14:53 UTCEPSS rescore
  50. 2026-09-11 14:04 UTCEG score recompute
  51. 2026-09-11 14:04 UTCGHSA enrichment
  52. 2026-09-10 21:08 UTCEG score recompute
  53. 2026-09-10 21:08 UTCGHSA enrichment
  54. 2026-09-10 09:35 UTCEPSS rescore
  55. 2026-09-10 07:58 UTCGHSA enrichment
  56. 2026-09-09 18:49 UTCGHSA enrichment
  57. 2026-09-09 05:41 UTCEG score recompute
  58. 2026-09-09 05:41 UTCGHSA enrichment
  59. 2026-09-08 22:01 UTCEPSS rescore
  60. 2026-09-08 07:15 UTCGHSA enrichment
  61. 2026-09-07 17:00 UTCEG score recompute
  62. 2026-09-07 17:00 UTCGHSA enrichment
  63. 2026-09-07 16:01 UTCEPSS rescore
  64. 2026-09-06 17:39 UTCEG score recompute
  65. 2026-09-06 17:39 UTCGHSA enrichment
  66. 2026-09-06 13:47 UTCEPSS rescore
  67. 2026-09-06 04:30 UTCEG score recompute
  68. 2026-09-06 04:30 UTCGHSA enrichment
  69. 2026-09-05 15:22 UTCGHSA enrichment
  70. 2026-09-05 01:43 UTCEG score recompute
  71. 2026-09-05 01:43 UTCGHSA enrichment
  72. 2026-09-04 08:18 UTCEG score recompute
  73. 2026-09-04 08:18 UTCGHSA enrichment
  74. 2026-09-04 05:07 UTCEPSS rescore
  75. 2026-09-03 16:29 UTCGHSA enrichment

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 on August 11, 2026, with the most recent update on August 31, 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 0.5% probability of exploitation in the next 30 days (42nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-56721?
CVE-2026-56721 has a CVSS base score of 8.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-56721?
An upstream fix for CVE-2026-56721 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix. The vendor advisories EchelonGraph has for CVE-2026-56721 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-56721

Explore →

Is Your Infrastructure Affected by CVE-2026-56721?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs