CVE-2026-28474Network attack vector

Unauthorized conversation access via display-name matching

Published Mar 5, 2026 · Updated Mar 5, 2026

Incorrect authorization in OpenClaw Nextcloud Talk plugin before 2026.2.6 allows remote attackers to bypass conversation allowlists. The resolveNextcloudTalkAllowlistMatch function normalizes actor.name and accepts it as equal to an allowFrom entry instead of relying only on stable actor.id. Control of a Nextcloud identity with a mutable display name is required, after which restricted direct messages or rooms accept the spoofed sender.

CVSS severity9.3
Critical
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in OpenClaw Nextcloud Talk plugin before 2026.2.6 allows remote attackers to bypass conversation allowlists. The resolveNextcloudTalkAllowlistMatch function normalizes actor.name and accepts it as equal to an allowFrom entry instead of relying only on stable actor.id. Control of a Nextcloud identity with a mutable display name is required, after which restricted direct messages or rooms accept the spoofed sender.

The record

CVE
CVE-2026-28474
Published
Mar 5, 2026
Updated
Mar 5, 2026
Vendor
OpenClaw Foundation
Product
Nextcloud Talk plugin
Classifications
CWE-863, T1036
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2026.2.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenClaw Foundation · Nextcloud Talk pluginversion=0 <2026.2.6

Published CVSS scores

9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1036Masquerading

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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