CVE-2026-24471

CRITICALNVD 9.39.3—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.3 under NVD CVSS v3. EPSS exploit probability: 0.0%, top 93% 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, nvd
9.3
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.3Exploit: NoneExposed: 0

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

continuwuity is a Matrix homeserver written in Rust. This vulnerability allows an attacker with a malicious remote server to cause the local server to sign an arbitrary event upon user interaction. Upon a user account leaving a room (rejecting an invite), joining a room or knocking on a room, the victim server may ask a remote server for assistance. If the victim asks the attacker server for assistance the attacker is able to provide an arbitrary event, which the victim will sign and return to the attacker. For the /leave endpoint, this works for any event with a supported room version, where the origin and origin_server_ts is set by the victim. For the /join endpoint, an additionally victim-set content field in the format of a join membership is needed. For the /knock endpoint, an additional victim-set content field in the format of a knock membership and a room version not between 1 and 6 is needed. This was exploited as a part of a larger chain against the continuwuity.org homeserver. This vulnerability affects all Conduit-derived servers. This vulnerability is fixed in Continuwuity 0.5.1, Conduit 0.10.11, Grapevine 0aae932b, and Tuwunel 1.4.9.

CVSS v3
9.3
EG Score
9.3(medium)
EG Risk
—
EPSS
23.4%
KEV
Not listed

Published

February 2, 2026

Last Modified

April 15, 2026

Advisory Details (2)

Auto-updated Jun 8, 2026
Patch available. Sources: github.
github Patch Available

Improper Validation in Conduit-derived homeservers resulting in Unintended Proxy or Intermediary ('Confused Deputy') · Advisory · continuwuity/continuwuity · GitHub

https://github.com/continuwuity/continuwuity/security/advisories/GHSA-m5p2-vccg-8c9v
generic

validate membership events returned by remote servers · 12aecf8091 - continuwuation/continuwuity - Ellis Git

https://forgejo.ellis.link/continuwuation/continuwuity/commit/12aecf809172205436c852a1eaf268c1a2c3a900

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 49× 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.

Showing the most recent 100 of 119 total refreshes for this CVE.

  1. 2026-07-22 14:08 UTCEPSS rescore
  2. 2026-07-21 15:24 UTCEPSS rescore
  3. 2026-07-21 15:24 UTCEPSS rescore
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  16. 2026-07-13 19:38 UTCOSV refresh
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  21. 2026-07-11 08:27 UTCEPSS rescore
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  1. 2026-07-06 16:27 UTCEPSS rescore
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  10. 2026-06-30 23:22 UTCEPSS rescore
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  18. 2026-06-25 17:16 UTCOSV refresh
  19. 2026-06-25 13:49 UTCEPSS rescore
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  21. 2026-06-24 14:05 UTCEPSS rescore
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  25. 2026-06-22 14:25 UTCEPSS rescore
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  27. 2026-06-21 14:56 UTCEPSS rescore
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  31. 2026-06-19 19:25 UTCEPSS rescore
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  46. 2026-06-08 14:17 UTCEPSS rescore
  47. 2026-06-08 14:17 UTCEPSS rescore
  48. 2026-06-07 22:43 UTCEG score recompute▲ 9.30
  49. 2026-06-07 15:25 UTCEPSS rescore
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  52. 2026-06-06 13:47 UTCEPSS rescore
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  63. 2026-06-01 15:27 UTCOSV refresh
  64. 2026-06-01 13:51 UTCEPSS rescore
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  67. 2026-05-31 22:30 UTCEPSS rescore
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  72. 2026-05-29 13:44 UTCEPSS rescore
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  74. 2026-05-28 13:44 UTCEPSS rescore
  75. 2026-05-28 13:44 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-24471?
CVE-2026-24471 is a critical vulnerability published on February 2, 2026. continuwuity is a Matrix homeserver written in Rust. This vulnerability allows an attacker with a malicious remote server to cause the local server to sign an arbitrary event upon user interaction. Upon a user account leaving a room (rejecting an invite), joining a room or knocking on a room, the…
When was CVE-2026-24471 disclosed?
CVE-2026-24471 was first published in the National Vulnerability Database on February 2, 2026, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-24471 actively exploited?
CVE-2026-24471 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 23.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-24471?
CVE-2026-24471 has a CVSS v3 base score of 9.3 (NVD).
How do I remediate CVE-2026-24471?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-24471, 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.

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