CVE-2026-50143

HIGHPre-NVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 63% 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
Elevated
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 8.1Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

The Apify MCP server enables AI agents to extract data from websites using ready-made scrapers, crawlers, and automation tools available on the Apify Store. Prior to 0.10.11, getActorMCPServerURL in src/mcp/actors.ts concatenates the trusted Actor standby URL with the attacker-controlled webServerMcpPath from an Actor definition without verifying the resulting origin, allowing a malicious Actor publisher to use a userinfo-style authority value to redirect connectMCPClient to a third-party host. The call-actor, fetch-actor-details, and actor-mcp tool-loading paths pass this URL to transports in src/mcp/client.ts that attach the victim Authorization bearer token, exposing the Apify API token and enabling access to Actors, stored data, and billable compute. A victim must invoke or inspect the attacker-controlled Actor. This issue is fixed in version 0.10.11.

CVSS v3
8.1
EG Score
8.1HIGHmedium confidence
EG Risk
52
EG Risk 52/100

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
Severity81% × 45%
Exploitation40% × 40%
Automatability0% × 15%
EPSS PROB
0.5%
EPSS %ILE
40th
KEV
Not listed

Published

July 1, 2026

Last Modified

September 18, 2026

Advisory Details (4)

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

0.10.11

Patch available: apify/apify-mcp-server v0.10.11

https://github.com/apify/apify-mcp-server/releases/tag/v0.10.11
github_commit Patch Available

commit ef686d77da3d (apify/apify-mcp-server)

Patch available: apify/apify-mcp-server v0.10.11 (contains commit ef686d77da3d)

https://github.com/apify/apify-mcp-server/commit/ef686d77da3d3c86c30b2ae24218d756aa38e09c
github_pr Patch Available

fix(mcp): Validate webServerMcpPath stays within Actor standby origin

Patch available: apify/apify-mcp-server v0.10.11 (PR #927 merged 2026-05-28)

https://github.com/apify/apify-mcp-server/pull/927
githubMentions a patch (unverified)🟡 PoC Available

Actor MCP path authority injection leaks Apify token · Advisory · apify/apify-mcp-server · GitHub

https://github.com/apify/apify-mcp-server/security/advisories/GHSA-6gr2-qh89-hxwm

Vendor Advisories for CVE-2026-50143(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)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
@apify/actors-mcp-server—
  • every version up to 0.10.11: fixed in 0.10.11
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 28× 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. 2026-10-10 20:00 UTCEPSS rescore
  2. 2026-10-09 20:07 UTCEPSS rescore
  3. 2026-10-08 17:12 UTCEPSS rescore
  4. 2026-10-07 23:48 UTCEPSS rescore
  5. 2026-10-06 15:18 UTCEPSS rescore
  6. 2026-10-05 17:43 UTCEPSS rescore
  7. 2026-10-04 23:22 UTCEPSS rescore
  8. 2026-10-03 14:26 UTCEPSS rescore
  9. 2026-10-02 17:56 UTCEPSS rescore
  10. 2026-10-01 19:50 UTCEPSS rescore
  11. 2026-09-30 15:03 UTCEPSS rescore
  12. 2026-09-28 13:51 UTCEPSS rescore
  13. 2026-09-27 13:48 UTCEPSS rescore
  14. 2026-09-26 15:59 UTCEPSS rescore
  15. 2026-09-26 00:27 UTCEPSS rescore
  16. 2026-09-23 17:53 UTCEPSS rescore
  17. 2026-09-23 06:48 UTCEG score recompute
  18. 2026-09-20 20:16 UTCEPSS rescore
  19. 2026-09-18 20:36 UTCEG score recompute
  20. 2026-09-18 19:28 UTCEPSS rescore
  21. 2026-09-18 06:28 UTCEG score recompute
  22. 2026-09-16 14:08 UTCEPSS rescore
  23. 2026-09-16 05:15 UTCEPSS rescore
  24. 2026-09-14 00:21 UTCEG score recompute
  25. 2026-09-13 16:47 UTCEPSS rescore
Show 40 more
  1. 2026-09-13 09:06 UTCEG score recompute
  2. 2026-09-12 14:36 UTCEG score recompute
  3. 2026-09-11 14:53 UTCEPSS rescore
  4. 2026-09-10 09:35 UTCEPSS rescore
  5. 2026-09-08 22:01 UTCEPSS rescore
  6. 2026-09-07 16:01 UTCEPSS rescore
  7. 2026-09-06 14:26 UTCEG score recompute
  8. 2026-09-06 13:47 UTCEPSS rescore
  9. 2026-09-06 00:36 UTCEG score recompute
  10. 2026-09-04 05:06 UTCEPSS rescore
  11. 2026-09-02 14:12 UTCEPSS rescore
  12. 2026-09-01 13:54 UTCEPSS rescore
  13. 2026-09-01 04:40 UTCEPSS rescore
  14. 2026-08-30 22:42 UTCEG score recompute
  15. 2026-08-30 19:17 UTCEPSS rescore
  16. 2026-08-30 11:33 UTCEG score recompute
  17. 2026-08-30 01:22 UTCEPSS rescore
  18. 2026-08-28 21:41 UTCEPSS rescore
  19. 2026-08-27 22:24 UTCEG score recompute
  20. 2026-08-27 14:25 UTCEPSS rescore
  21. 2026-08-26 14:46 UTCEPSS rescore
  22. 2026-08-25 16:15 UTCEG score recompute
  23. 2026-08-25 13:49 UTCEPSS rescore
  24. 2026-08-24 20:58 UTCEG score recompute
  25. 2026-08-23 07:01 UTCEG score recompute
  26. 2026-08-23 00:19 UTCEPSS rescore
  27. 2026-08-22 06:54 UTCEG score recompute
  28. 2026-08-21 23:49 UTCEPSS rescore
  29. 2026-08-21 04:30 UTCEG score recompute
  30. 2026-08-20 22:55 UTCEPSS rescore
  31. 2026-08-20 04:35 UTCEG score recompute
  32. 2026-08-19 17:04 UTCEPSS rescore
  33. 2026-08-19 07:41 UTCEG score recompute
  34. 2026-08-18 20:25 UTCEG score recompute
  35. 2026-08-18 19:45 UTCEG score recompute
  36. 2026-08-18 18:25 UTCEG score recompute
  37. 2026-07-30 11:03 UTCEG score recompute
  38. 2026-07-26 13:13 UTCEG score recompute
  39. 2026-07-23 03:18 UTCEG score recompute
  40. 2026-07-01 23:02 UTCEG score recompute

Related CVEs(same product + same CWE)

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npm:@apify/actors-mcp-server

Frequently asked(5)

What is CVE-2026-50143?
CVE-2026-50143 is a high vulnerability published on July 1, 2026. The Apify MCP server enables AI agents to extract data from websites using ready-made scrapers, crawlers, and automation tools available on the Apify Store. Prior to 0.10.11, getActorMCPServerURL in src/mcp/actors.ts concatenates the trusted Actor standby URL with the attacker-controlled…
When was CVE-2026-50143 disclosed?
CVE-2026-50143 was first published on July 1, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-50143 actively exploited?
CVE-2026-50143 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (40th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-50143?
CVE-2026-50143 has a CVSS base score of 8.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-50143?
A fix for CVE-2026-50143 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-50143 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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