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 mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.0%CVSS: 7.5Exploit: 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.

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
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100CISA 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
Severity75% × 45%
Exploitation1% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend 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 at low or medium mission impact and sooner than that at high until it ships, then apply the release.
EPSS PROB
1.0%
EPSS %ILE
60th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend 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 at low or medium mission impact and sooner than that at high until it ships, then apply the release.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (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 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 19× in last 7d / 89× 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 199 total refreshes for this CVE.

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

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 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 1.0% probability of exploitation in the next 30 days (60th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-53977?
CVE-2026-53977 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-53977?
An upstream fix for CVE-2026-53977 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-2026-53977 are linked in the Vendor Advisories panel on this page.

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