CVE-2022-26809

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-04-16. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Weaponized
9.8EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 91%
  • Public exploit code is available (ssvc poc, epss top5pct, epss high, public exploit)
CISA-KEV: Not listedEPSS PROB: 91%CVSS: 9.8Exploit: ssvc poc · epss top5pct · epss high · public exploitExposed services: Not assessed

A fix is available — apply it.

Remote Procedure Call Runtime Remote Code Execution Vulnerability

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
95
EG Risk 95/100CISA 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
Severity98% × 45%
Exploitation91% × 40%
Automatability100% × 15%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
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
91%
EPSS %ILE
99th
KEV
Not listed

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

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

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (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

April 15, 2022

Last Modified

November 21, 2024

Advisory Details (1)

Auto-updated Oct 3, 2026
Patch available. Sources: microsoft.
microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-26809

Vendor Advisories for CVE-2022-26809(1)

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

Data Freshness Timeline

(refreshed 2× in last 7d / 8× 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. 2026-09-30 15:52 UTCEG score recompute
  2. 2026-09-30 15:00 UTCEPSS rescore
  3. 2026-09-24 14:00 UTCEPSS rescore
  4. 2026-09-23 13:45 UTCEPSS rescore
  5. 2026-09-11 09:33 UTCEPSS rescore
  6. 2026-09-07 15:58 UTCEPSS rescore
  7. 2026-09-06 13:45 UTCEPSS rescore
  8. 2026-09-05 15:25 UTCEPSS rescore
  9. 2026-08-30 19:14 UTCEPSS rescore
  10. 2026-08-28 21:38 UTCEPSS rescore
  11. 2026-08-24 14:13 UTCEPSS rescore
  12. 2026-08-15 01:27 UTCEPSS rescore
  13. 2026-08-12 13:48 UTCEPSS rescore
  14. 2026-08-08 16:34 UTCEPSS rescore
  15. 2026-08-07 16:24 UTCEPSS rescore
  16. 2026-08-06 13:44 UTCEPSS rescore
  17. 2026-08-05 19:15 UTCEPSS rescore
  18. 2026-07-30 16:25 UTCEPSS rescore
  19. 2026-07-24 14:15 UTCEPSS rescore
  20. 2026-07-23 02:09 UTCEG score recompute
  21. 2026-07-22 22:56 UTCEG score recompute
  22. 2026-07-22 14:06 UTCEPSS rescore
  23. 2026-07-22 14:06 UTCEPSS rescore
  24. 2026-07-15 16:56 UTCEPSS rescore
  25. 2026-07-15 16:56 UTCEPSS rescore
Show 24 more
  1. 2026-07-07 13:44 UTCEPSS rescore
  2. 2026-07-06 16:25 UTCEPSS rescore
  3. 2026-07-06 16:25 UTCEPSS rescore
  4. 2026-07-04 06:29 UTCEPSS rescore
  5. 2026-07-04 06:29 UTCEPSS rescore
  6. 2026-07-01 15:04 UTCEPSS rescore
  7. 2026-06-27 03:07 UTCEPSS rescore
  8. 2026-06-23 21:31 UTCEPSS rescore
  9. 2026-06-23 21:31 UTCEPSS rescore
  10. 2026-06-18 17:51 UTCEPSS rescore
  11. 2026-06-18 17:51 UTCEPSS rescore
  12. 2026-06-16 17:51 UTCEPSS rescore
  13. 2026-06-15 17:46 UTCEPSS rescore
  14. 2026-06-12 23:10 UTCEPSS rescore
  15. 2026-06-12 23:10 UTCEPSS rescore
  16. 2026-06-06 13:46 UTCEPSS rescore
  17. 2026-06-06 13:46 UTCEPSS rescore
  18. 2026-06-05 06:09 UTCEPSS rescore
  19. 2026-06-05 06:09 UTCEPSS rescore
  20. 2026-05-29 13:42 UTCEPSS rescore
  21. 2026-05-26 13:43 UTCEPSS rescore
  22. 2026-05-25 23:38 UTCEG score recompute
  23. 2026-05-25 23:38 UTCVendor advisory
  24. 2026-05-25 23:38 UTCGHSA enrichment

Publicly available exploits

(7 references)

Working exploit code is in the public domain (7 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCfuckjsonp/FuckJsonp-RCE-CVE-2022-26809-SQL-XSS-FuckJsonp
    First seen Jul 27, 2022

    警惕 一种针对红队的新型溯源手段!

    Open source ↗
  • GitHub PoCs1ckb017/PoC-CVE-2022-26809
    First seen Jun 13, 2022

    PoC for CVE-2022-26809, analisys and considerations are shown in the github.io.

    Open source ↗
  • GitHub PoCyuanLink/CVE-2022-26809
    First seen May 1, 2022
    Open source ↗
  • GitHub PoCauduongxuan/CVE-2022-26809
    First seen Apr 14, 2022
    Open source ↗
  • GitHub PoCcorelight/cve-2022-26809
    First seen Apr 14, 2022

    Detects attempts and successful exploitation of CVE-2022-26809

    Open source ↗
  • GitHub PoCsherlocksecurity/Microsoft-CVE-2022-26809-The-Little-Boy
    First seen Apr 14, 2022

    The poc for CVE-2022-26809 RCE via RPC will be updated here.

    Open source ↗
  • GitHub PoCwebsecnl/CVE-2022-26809
    First seen Apr 14, 2022

    Remote Code Execution Exploit in the RPC Library

    Open source ↗

Frequently asked(5)

What is CVE-2022-26809?
CVE-2022-26809 is a critical vulnerability published on April 15, 2022. Remote Procedure Call Runtime Remote Code Execution Vulnerability
When was CVE-2022-26809 disclosed?
CVE-2022-26809 was first published on April 15, 2022, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2022-26809 actively exploited?
CVE-2022-26809 is not currently on CISA's Known Exploited Vulnerabilities catalog. EchelonGraph's EG-KEV model classifies it as weaponized: a functional public exploit exists. FIRST EPSS estimates a 91% probability of exploitation in the next 30 days (99th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2022-26809?
CVE-2022-26809 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2022-26809?
A fix for CVE-2022-26809 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2022-26809 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2022-26809

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