CVE-2026-73840

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (25th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 5.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

OpenChoreo is a complete, open-source developer platform for Kubernetes. Prior to 1.0.3, 1.1.3, and 1.2.0-rc.2, the POST /api/v1alpha1/autobuild endpoint in internal/openchoreo-api/api/handlers/webhook_handler.go selected a webhook provider from caller-controlled X-Event-Key, accepted Bitbucket requests without HMAC-SHA256 in X-Hub-Signature or a configured bitbucket-secret, and allowed unauthenticated build triggers for components matched by repository URL and branch, including cross-provider triggers using attacker-supplied commit SHAs. This issue is fixed in versions 1.0.3, 1.1.3, and 1.2.0-rc.2.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
39
EG Risk 39/100CISA 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
Severity53% × 45%
Exploitation0% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.3%
EPSS %ILE
26th
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

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 13, 2026

Last Modified

September 8, 2026

Advisory Details (10)

Auto-updated Aug 13, 2026
Patch available. Sources: github_commit, github_pr, github_release, github.
githubMentions a patch (unverified)

Unauthenticated build/workflow trigger via git-provider confusion (webhook signature bypass) · Advisory · openchoreo/openchoreo · GitHub

Affected: 1.0.3, 1.1.3, and 1.2.0-rc.2. The fix validates Bitbucket webhooks with HMAC-SHA2

https://github.com/openchoreo/openchoreo/security/advisories/GHSA-c5f6-2rm9-2w8g
github_release Patch Available

v1.2.0-rc.2

Patch available: openchoreo/openchoreo v1.2.0-rc.2 (pre-release)

https://github.com/openchoreo/openchoreo/releases/tag/v1.2.0-rc.2
github_release Patch Available

v1.1.3

Patch available: openchoreo/openchoreo v1.1.3

https://github.com/openchoreo/openchoreo/releases/tag/v1.1.3
github_release Patch Available

v1.0.3

Patch available: openchoreo/openchoreo v1.0.3

https://github.com/openchoreo/openchoreo/releases/tag/v1.0.3
github_pr

feat(api): enforce webhook signature verification across all git providers (backport to release-v1.1)

Fix merged in openchoreo/openchoreo PR #4253 on 2026-07-22 — awaiting tagged release

https://github.com/openchoreo/openchoreo/pull/4253
github_pr

feat(api): enforce webhook signature verification across all git providers (backport to release-v1.0)

Fix merged in openchoreo/openchoreo PR #4252 on 2026-07-22 — awaiting tagged release

https://github.com/openchoreo/openchoreo/pull/4252
github_pr

feat(api): enforce webhook signature verification across all git providers

Fix merged in openchoreo/openchoreo PR #4239 on 2026-07-21 — awaiting tagged release

https://github.com/openchoreo/openchoreo/pull/4239
github_commit

commit f540553db714 (openchoreo/openchoreo)

Fix landed in openchoreo/openchoreo commit f540553db714 — awaiting tagged release

https://github.com/openchoreo/openchoreo/commit/f540553db7143141b73bb37fae02102e6f082a34
github_commit

commit 8af4a3fc8725 (openchoreo/openchoreo)

Fix landed in openchoreo/openchoreo commit 8af4a3fc8725 — awaiting tagged release

https://github.com/openchoreo/openchoreo/commit/8af4a3fc8725fc2d8a9de9611e77278a5c48f978
github_commit

commit 268efd9b762a (openchoreo/openchoreo)

Fix landed in openchoreo/openchoreo commit 268efd9b762a — awaiting tagged release

https://github.com/openchoreo/openchoreo/commit/268efd9b762a3f4f72b55d9c1b13dfc55122127b

Vendor Advisories for CVE-2026-73840(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFix by version rangeDependents
github.com/openchoreo/openchoreo—
  • every version up to 1.0.3: fixed in 1.0.3
  • 1.1.0 up to 1.1.3: fixed in 1.1.3
  • 1.2.0-rc.1 up to 1.2.0-rc.2: fixed in 1.2.0-rc.2
—

Weakness Classification(3)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 43× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 4 repeat rows among the latest 98 are merged into the row they repeat.

  1. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  2. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  3. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  4. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  5. 2026-10-07 08:07 UTCEG score recompute
  6. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  7. 2026-10-06 09:25 UTCEG score recompute
  8. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  9. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  10. 2026-10-03 19:44 UTCEG score recompute
  11. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  12. 2026-10-02 07:26 UTCEG score recompute
  13. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  14. 2026-09-30 21:43 UTCEG score recompute
  15. 2026-09-29 15:24 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  16. 2026-09-29 07:18 UTCEG score recompute
  17. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  18. 2026-09-28 08:32 UTCEG score recompute
  19. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  20. 2026-09-27 09:40 UTCEG score recompute
  21. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  22. 2026-09-26 00:28 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  23. 2026-09-25 03:25 UTCEG score recompute
  24. 2026-09-23 20:47 UTCEG score recompute
  25. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 15th percentile
Show 69 more
  1. 2026-09-22 20:58 UTCEG score recompute
  2. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  3. 2026-09-20 20:28 UTCEG score recompute
  4. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  5. 2026-09-19 21:46 UTCEG score recompute
  6. 2026-09-18 23:05 UTCEG score recompute
  7. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  8. 2026-09-18 00:24 UTCEG score recompute
  9. 2026-09-16 23:51 UTCEG score recompute
  10. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  11. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  12. 2026-09-15 19:30 UTCEG score recompute
  13. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  14. 2026-09-13 21:41 UTCEG score recompute
  15. 2026-09-12 23:00 UTCEG score recompute
  16. 2026-09-12 15:02 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  17. 2026-09-11 23:53 UTCEG score recompute
  18. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  19. 2026-09-11 00:55 UTCEG score recompute
  20. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  21. 2026-09-10 01:33 UTCEG score recompute
  22. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  23. 2026-09-07 20:38 UTCEG score recompute
  24. 2026-09-06 21:56 UTCEG score recompute
  25. 2026-09-06 13:48 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  26. 2026-09-05 23:09 UTCEG score recompute
  27. 2026-09-05 00:28 UTCEG score recompute
  28. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  29. 2026-09-03 01:00 UTCEG score recompute
  30. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  31. 2026-09-02 01:55 UTCEG score recompute
  32. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  33. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  34. 2026-08-31 04:23 UTCEG score recompute
  35. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  36. 2026-08-30 05:41 UTCEG score recompute
  37. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  38. 2026-08-29 07:00 UTCEG score recompute
  39. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  40. 2026-08-27 23:41 UTCEG score recompute
  41. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  42. 2026-08-27 00:50 UTCEG score recompute
  43. 2026-08-26 14:47 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  44. 2026-08-26 02:09 UTCEG score recompute
  45. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  46. 2026-08-25 03:28 UTCEG score recompute
  47. 2026-08-23 06:06 UTCEG score recompute
  48. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  49. 2026-08-22 07:25 UTCEG score recompute
  50. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  51. 2026-08-21 08:44 UTCEG score recompute
  52. 2026-08-20 22:56 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  53. 2026-08-20 10:03 UTCEG score recompute
  54. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  55. 2026-08-19 11:22 UTCEG score recompute
  56. 2026-08-18 13:49 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  57. 2026-08-18 12:41 UTCEG score recompute
  58. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  59. 2026-08-17 13:36 UTCEG score recompute
  60. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  61. 2026-08-16 14:55 UTCEG score recompute
  62. 2026-08-16 02:15 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  63. 2026-08-15 16:15 UTCEG score recompute
  64. 2026-08-15 01:31 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  65. 2026-08-14 17:33 UTCEG score recompute
  66. 2026-08-14 16:44 UTCEG score recompute
  67. 2026-08-13 22:25 UTCEG score recompute
  68. 2026-08-13 22:09 UTCEG score recompute
  69. 2026-08-13 22:09 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-73840?
CVE-2026-73840 is a medium vulnerability published on August 13, 2026. OpenChoreo is a complete, open-source developer platform for Kubernetes. Prior to 1.0.3, 1.1.3, and 1.2.0-rc.2, the POST /api/v1alpha1/autobuild endpoint in internal/openchoreo-api/api/handlers/webhook_handler.go selected a webhook provider from caller-controlled X-Event-Key, accepted Bitbucket…
When was the CVE record for CVE-2026-73840 published?
The CVE record for CVE-2026-73840 was published on August 13, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 8, 2026; the record at its source may have been updated since.
Is CVE-2026-73840 actively exploited?
CVE-2026-73840 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (26th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-73840?
CVE-2026-73840 has a CVSS base score of 5.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-73840?
A fix for CVE-2026-73840 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-73840 are linked in the Vendor Advisories panel on this page.

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