CVE-2026-28474
OpenClaw Nextcloud Talk < 2026.2.6 - Allowlist Bypass via actor.name Display Name Spoofing
OpenClaw's Nextcloud Talk plugin versions prior to 2026.2.6 accept equality matching on the mutable actor.name display name field for allowlist validation, allowing attackers to bypass DM and room allowlists. An attacker can change their Nextcloud display name to match an allowlisted user ID and gain unauthorized access to restricted conversations.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
OpenClaw Nextcloud Talk < 2026.2.6 - Allowlist Bypass via actor.name Display Name Spoofing
OpenClaw's Nextcloud Talk plugin versions prior to 2026.2.6 accept equality matching on the mutable actor.name display name field for allowlist validation, allowing attackers to bypass DM and room allowlists. An attacker can change their Nextcloud display name to match an allowlisted user ID and gain unauthorized access to restricted conversations.
- Record
CVE-2026-28474- CVSS 4.0
- 9.3 Critical
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N - CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-863
- Updated
- 2026-11-02
EUVDEUVD-2026-9920
OpenClaw's Nextcloud Talk plugin versions prior to 2026.2.6 accept equality matching on the mutable actor.name display name field for allowlist validation, allowing attackers to bypass DM and room allowlists. An attacker can change their Nextcloud display name to match an allowlisted user ID and gain unauthorized access to restricted conversations.
- Record
EUVD-2026-9920- CVSS 4.0
- 9.3 Critical
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-r5h9-vjqc-hq3r
Nextcloud Talk allowlist bypass via actor.name display name spoofing
Summary
In affected versions of the optional Nextcloud Talk plugin (installed separately; not bundled with the core OpenClaw install), an untrusted webhook field (actor.name, display name) could be treated as an allowlist identifier. An attacker could change their Nextcloud display name to match an allowlisted user ID and bypass DM or room allowlists.
Details
Nextcloud Talk webhook payloads provide a stable sender identifier (actor.id) and a mutable display name (actor.name). In affected versions, the plugin’s allowlist matching accepted equality on the display name, which is attacker-controlled.
Affected Packages / Versions
- Package:
@openclaw/nextcloud-talk(npm) - Affected:
<= 2026.2.2 - Fixed:
>= 2026.2.6
Note: This advisory applies to the optional Nextcloud Talk plugin package. Core openclaw is not impacted unless you installed and use @openclaw/nextcloud-talk.
Fix Commit(s)
Timeline
- Introduced: 660f87278c9f292061e097441e0b10c20d62b31b (2026-01-20)
- Fixed in repo: 6b4b6049b47c3329a7014509594647826669892d (2026-02-04 UTC)
- First fixed tag containing the change: v2026.2.3
- First fixed npm release of
@openclaw/nextcloud-talk:2026.2.6(published 2026-02-07 UTC)
Mitigation
Upgrade @openclaw/nextcloud-talk to >= 2026.2.6.
Release Process Note
The patched version range is set to the first npm release that contains the fix. Once you are ready, you can publish this advisory without additional version edits.
Thanks @MegaManSec (https://joshua.hu) of AISLE Research Team for reporting.
- Record
GHSA-r5h9-vjqc-hq3r- CVSS 4.0
- 9.3 Critical
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N - Weakness
- CWE-290
- Updated
- 2026-11-02
NVD
OpenClaw's Nextcloud Talk plugin versions prior to 2026.2.6 accept equality matching on the mutable actor.name display name field for allowlist validation, allowing attackers to bypass DM and room allowlists. An attacker can change their Nextcloud display name to match an allowlisted user ID and gain unauthorized access to restricted conversations.
- Record
CVE-2026-28474- CVSS 4.0
- 9.3 Critical
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-863
- Updated
- 2026-11-02
OSV
OpenClaw Nextcloud Talk < 2026.2.6 - Allowlist Bypass via actor.name Display Name Spoofing
OpenClaw's Nextcloud Talk plugin versions prior to 2026.2.6 accept equality matching on the mutable actor.name display name field for allowlist validation, allowing attackers to bypass DM and room allowlists. An attacker can change their Nextcloud display name to match an allowlisted user ID and gain unauthorized access to restricted conversations.
- Record
CVE-2026-28474- CVSS 4.0
- 9.3 Critical
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N - Weakness
- CWE-863
- Updated
- 2026-11-02
OSVGHSA-r5h9-vjqc-hq3r
Nextcloud Talk allowlist bypass via actor.name display name spoofing
Summary
In affected versions of the optional Nextcloud Talk plugin (installed separately; not bundled with the core OpenClaw install), an untrusted webhook field (actor.name, display name) could be treated as an allowlist identifier. An attacker could change their Nextcloud display name to match an allowlisted user ID and bypass DM or room allowlists.
Details
Nextcloud Talk webhook payloads provide a stable sender identifier (actor.id) and a mutable display name (actor.name). In affected versions, the plugin’s allowlist matching accepted equality on the display name, which is attacker-controlled.
Affected Packages / Versions
- Package:
@openclaw/nextcloud-talk(npm) - Affected:
<= 2026.2.2 - Fixed:
>= 2026.2.6
Note: This advisory applies to the optional Nextcloud Talk plugin package. Core openclaw is not impacted unless you installed and use @openclaw/nextcloud-talk.
Fix Commit(s)
Timeline
- Introduced: 660f87278c9f292061e097441e0b10c20d62b31b (2026-01-20)
- Fixed in repo: 6b4b6049b47c3329a7014509594647826669892d (2026-02-04 UTC)
- First fixed tag containing the change: v2026.2.3
- First fixed npm release of
@openclaw/nextcloud-talk:2026.2.6(published 2026-02-07 UTC)
Mitigation
Upgrade @openclaw/nextcloud-talk to >= 2026.2.6.
Release Process Note
The patched version range is set to the first npm release that contains the fix. Once you are ready, you can publish this advisory without additional version edits.
Thanks @MegaManSec (https://joshua.hu) of AISLE Research Team for reporting.
- Record
GHSA-r5h9-vjqc-hq3r- CVSS 4.0
- 9.3 Critical
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N - Weakness
- CWE-290
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
@openclaw/nextcloud-talknpm | through 2026.2.2 | 2026.2.6 |
@openclaw/nextcloud-talknpm | before 2026.2.6 | 2026.2.6 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-28474 is a critical vulnerability (CVSS 9.3) in Openclaw, published February 17, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.55%, the 46th percentile. Fixed in @openclaw/nextcloud-talk 2026.2.6.
References
github.com/openclaw/openclaw/security/advisories/GHSA-r5h9-vjqc-hq3r
vulncheck.com/advisories/openclaw-nextcloud-talk-allowlist-bypass-via-actorname-display-name-spoofing
nvd.nist.gov/vuln/detail/CVE-2026-28474