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: 0.2%, top 85% of all CVEs by exploit prediction. 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%CVSS: 5.3Exploit: None knownExposed: 0

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

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
5.3(medium)
EG Risk
39(Track)
EG Risk 39/100SSVC: 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
Severity53% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
15%
KEV
Not listed

Published

August 13, 2026

Last Modified

August 14, 2026

Advisory Details (10)

Auto-updated Aug 13, 2026
Patch available. Sources: github_commit, github_pr, github_release, github.
github Patch Available

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

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 30× 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.

  1. 2026-08-27 00:50 UTCEG score recompute
  2. 2026-08-26 14:47 UTCEPSS rescore
  3. 2026-08-26 02:09 UTCEG score recompute
  4. 2026-08-25 13:49 UTCEPSS rescore
  5. 2026-08-25 03:28 UTCEG score recompute
  6. 2026-08-23 06:06 UTCEG score recompute
  7. 2026-08-23 00:19 UTCEPSS rescore
  8. 2026-08-22 07:25 UTCEG score recompute
  9. 2026-08-21 23:49 UTCEPSS rescore
  10. 2026-08-21 08:44 UTCEG score recompute
  11. 2026-08-20 22:56 UTCEPSS rescore
  12. 2026-08-20 10:03 UTCEG score recompute
  13. 2026-08-19 17:04 UTCEPSS rescore
  14. 2026-08-19 11:22 UTCEG score recompute
  15. 2026-08-18 13:49 UTCEPSS rescore
  16. 2026-08-18 13:49 UTCEPSS rescore
  17. 2026-08-18 12:41 UTCEG score recompute
  18. 2026-08-17 13:47 UTCEPSS rescore
  19. 2026-08-17 13:36 UTCEG score recompute
  20. 2026-08-16 14:56 UTCEPSS rescore
  21. 2026-08-16 14:56 UTCEPSS rescore
  22. 2026-08-16 14:55 UTCEG score recompute
  23. 2026-08-16 02:15 UTCEPSS rescore
  24. 2026-08-15 16:15 UTCEG score recompute
  25. 2026-08-15 01:31 UTCEPSS rescore
Show 5 more
  1. 2026-08-14 17:33 UTCEG score recompute
  2. 2026-08-14 16:44 UTCEG score recompute
  3. 2026-08-13 22:25 UTCEG score recompute
  4. 2026-08-13 22:09 UTCEG score recompute
  5. 2026-08-13 22:09 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

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 CVE-2026-73840 disclosed?
CVE-2026-73840 was first published in the National Vulnerability Database on August 13, 2026, with the most recent update on August 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-73840 actively exploited?
CVE-2026-73840 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 85.5% of all scored CVEs.
What is the CVSS score of CVE-2026-73840?
CVE-2026-73840 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-73840?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-73840, 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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