CVE-2026-53976

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-06. A secondary CVSS source baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
9.1EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2.6%CVSS: 9.1Exploit: Elevated riskExposed 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 a path traversal vulnerability in the file-serving endpoints /api/fs/read, /api/fs/stat, and /api/fs/raw that allows unauthenticated remote attackers to read arbitrary files by supplying the allowOutsideWorkspace=true query parameter alongside an absolute path, bypassing the workspace boundary check in resolveReadPathFromContext. Attackers can exploit the vacuous isPathWithinRoot guard to read sensitive files such as the JWT signing secret, SSH private keys, API credentials, and environment variables, enabling full authentication bypass by forging session cookies on password-protected deployments.

CVSS v3
9.1
EG Score
9.1CRITICALmedium confidence
EG Risk
61
EG Risk 61/100CISA 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
Severity91% × 45%
Exploitation40% × 40%
Automatability30% × 15%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
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
2.6%
EPSS %ILE
84th
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

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 public PoC (EG-KEV: elevated) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). 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 Sep 16, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

OpenChamber 1.11.7 Path Traversal File Read via allowOutsideWorkspace Parameter | Advisories | VulnCheck

https://www.vulncheck.com/advisories/openchamber-path-traversal-file-read-via-allowoutsideworkspace-parameter
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: Agentic Development Environment based on OpenCode AI agent · GitHub

https://github.com/openchamber/openchamber

Vendor Advisories for CVE-2026-53976(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 / 142× 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 348 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

Working exploit code is in the public domain. Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Nucleihttp/cves/2026/CVE-2026-53976.yaml
    First seen Jan 1, 2026

    OpenChamber <1.13.0 - Unauthenticated Arbitrary File Read

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-53976?
CVE-2026-53976 is a critical vulnerability published on August 6, 2026. OpenChamber 1.11.7 contains a path traversal vulnerability in the file-serving endpoints /api/fs/read, /api/fs/stat, and /api/fs/raw that allows unauthenticated remote attackers to read arbitrary files by supplying the allowOutsideWorkspace=true query parameter alongside an absolute path, bypassing…
When was CVE-2026-53976 disclosed?
CVE-2026-53976 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-2026-53976 actively exploited?
CVE-2026-53976 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.6% probability of exploitation in the next 30 days (84th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-53976?
CVE-2026-53976 has a CVSS base score of 9.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-53976?
An upstream fix for CVE-2026-53976 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-2026-53976 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-53976

Explore →

Is Your Infrastructure Affected by CVE-2026-53976?

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

Book a Demo →Browse All CVEs