CVE-2026-53977

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-06. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: None knownExposed: 0

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

OpenChamber 1.11.7 contains an authentication bypass vulnerability that allows unauthenticated remote attackers to terminate the server process by sending a POST request to the /api/system/shutdown endpoint, which is registered before the authentication middleware in the Express route handler chain. Attackers can exploit the route registration order in bootstrap-runtime.js to reach the shutdown handler before auth middleware executes, causing denial of service to all active AI coding sessions and locking out legitimate remote users regardless of whether UI_PASSWORD is configured.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
43%
KEV
Not listed

Published

August 6, 2026

Last Modified

September 16, 2026

Advisory Details (3)

Auto-updated Aug 6, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

OpenChamber 1.11.7 Unauthenticated DoS via /api/system/shutdown | Advisories | VulnCheck

https://www.vulncheck.com/advisories/openchamber-unauthenticated-dos-via-api-system-shutdown
github_commit

commit f1b9506132fa (openchamber/openchamber)

Fix landed in openchamber/openchamber commit f1b9506132fa — awaiting tagged release

https://github.com/openchamber/openchamber/commit/f1b9506132faf6c564a2694c7f33b94421a49b4a
generic

GitHub - openchamber/openchamber: Desktop and web interface for OpenCode AI agent · GitHub

https://github.com/openchamber/openchamber

Vendor Advisories for CVE-2026-53977(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 / 100× 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 161 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-53977?
CVE-2026-53977 is a high vulnerability published on August 6, 2026. OpenChamber 1.11.7 contains an authentication bypass vulnerability that allows unauthenticated remote attackers to terminate the server process by sending a POST request to the /api/system/shutdown endpoint, which is registered before the authentication middleware in the Express route handler…
When was CVE-2026-53977 disclosed?
CVE-2026-53977 was first published in the National Vulnerability Database on August 6, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53977 actively exploited?
CVE-2026-53977 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 56.8% of all scored CVEs.
What is the CVSS score of CVE-2026-53977?
CVE-2026-53977 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-53977?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53977, 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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