CVE-2026-50167

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: 0.4%, top 65% 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.

Kurrier is a modern, self-hosted workspace for email, calendar, contacts, and storage. Prior to 1.2.4, Kurrier API endpoints for listing and retrieving webhook and identity resources did not enforce ownership checks for authenticated API requests. An attacker with a valid API key could use another account's identifiers to read and enumerate webhook and identity resources belonging to that account through apps/worker/server/routes/api/kurrier/webhooks/[id].get.ts, apps/worker/server/routes/api/kurrier/webhooks/index.get.ts, apps/worker/server/routes/api/kurrier/identities/[id].get.ts, and apps/worker/server/routes/api/kurrier/identities/index.get.ts. Anonymous requests and invalid API keys were rejected, and cross-user modification operations were blocked, but affected GET and list operations could expose another user's resource metadata. This issue is fixed in version 1.2.4.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
24(Track)
EG Risk 24/100SSVC: 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%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
35%
KEV
Not listed

Published

August 18, 2026

Last Modified

August 19, 2026

Advisory Details (4)

Auto-updated Aug 18, 2026
Patch available. Sources: github_commit, github_pr, github_release, github.
github Patch Available

Authenticated cross-user authorization bypass in Kurrier API · Advisory · kurrier-org/kurrier · GitHub

https://github.com/kurrier-org/kurrier/security/advisories/GHSA-f7h3-f5vh-3764
github_release Patch Available

v1.2.4

Patch available: kurrier-org/kurrier v1.2.4

https://github.com/kurrier-org/kurrier/releases/tag/v1.2.4
github_pr Patch Available

scope api resources by owner

Patch available: kurrier-org/kurrier v1.2.4 (PR #446 merged 2026-05-28)

https://github.com/kurrier-org/kurrier/pull/446
github_commit Patch Available

commit 22fad36fb1bc (kurrier-org/kurrier)

Patch available: kurrier-org/kurrier v1.2.4 (contains commit 22fad36fb1bc)

https://github.com/kurrier-org/kurrier/commit/22fad36fb1bc79e3038184ddd485fb235217475c

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 20× 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 14:25 UTCEPSS rescore
  2. 2026-08-27 08:08 UTCEG score recompute
  3. 2026-08-26 14:46 UTCEPSS rescore
  4. 2026-08-26 09:30 UTCEG score recompute
  5. 2026-08-25 13:49 UTCEPSS rescore
  6. 2026-08-25 10:51 UTCEG score recompute
  7. 2026-08-24 12:16 UTCEG score recompute
  8. 2026-08-23 13:41 UTCEG score recompute
  9. 2026-08-23 00:19 UTCEPSS rescore
  10. 2026-08-22 15:06 UTCEG score recompute
  11. 2026-08-21 23:49 UTCEPSS rescore
  12. 2026-08-21 16:31 UTCEG score recompute
  13. 2026-08-20 22:55 UTCEPSS rescore
  14. 2026-08-19 19:21 UTCEG score recompute
  15. 2026-08-19 18:38 UTCEG score recompute
  16. 2026-08-19 18:14 UTCEG score recompute
  17. 2026-08-19 17:04 UTCEPSS rescore
  18. 2026-08-18 18:22 UTCEG score recompute
  19. 2026-08-18 18:15 UTCEG score recompute
  20. 2026-08-18 18:14 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-50167?
CVE-2026-50167 is a medium vulnerability published on August 18, 2026. Kurrier is a modern, self-hosted workspace for email, calendar, contacts, and storage. Prior to 1.2.4, Kurrier API endpoints for listing and retrieving webhook and identity resources did not enforce ownership checks for authenticated API requests. An attacker with a valid API key could use another…
When was CVE-2026-50167 disclosed?
CVE-2026-50167 was first published in the National Vulnerability Database on August 18, 2026, with the most recent update on August 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-50167 actively exploited?
CVE-2026-50167 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 64.9% of all scored CVEs.
What is the CVSS score of CVE-2026-50167?
CVE-2026-50167 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-50167?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-50167, 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

Explore the affected products and dependency analysis for CVE-2026-50167

Explore →

Is Your Infrastructure Affected by CVE-2026-50167?

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

Start Free Scan →Browse All CVEs