Chocobozzz PeerTube up to 8.2.1 ActivityPub processUpdateActivity/processUpdateVideo improper authorization

CVSS Meta Temp Score
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CTI Interest Score
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7.0$0-$5k0.39

Summaryinfo

A vulnerability was found in Chocobozzz PeerTube up to 8.2.1. It has been declared as critical. This affects the function processUpdateActivity/processUpdateVideo of the component ActivityPub. Such manipulation leads to improper authorization. This vulnerability is uniquely identified as CVE-2026-73090. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Chocobozzz PeerTube up to 8.2.1. Affected by this issue is the function processUpdateActivity/processUpdateVideo of the component ActivityPub. The manipulation with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality, integrity, and availability. CVE summarizes:

PeerTube is an ActivityPub-federated video streaming platform. Prior to 8.2.2, processUpdateActivity and processUpdateVideo accept an ActivityPub Update containing a Video object without verifying that byActor.url is authorized for the host in videoObject.id, allowing a malicious federated server to rewrite another server's video metadata, visibility, media file, and HLS URLs. This issue is fixed in version 8.2.2.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-73090 since 08/10/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1548.002.

Upgrading to version 8.2.2 eliminates this vulnerability.

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Productinfo

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Improper authorization
CWE: CWE-285 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: PeerTube 8.2.2

Timelineinfo

08/10/2026 CVE reserved
08/11/2026 +1 days Advisory disclosed
08/11/2026 +0 days VulDB entry created
08/11/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-73090 (🔒)
GCVE (CVE): GCVE-0-2026-73090
GCVE (VulDB): GCVE-100-388352

Entryinfo

Created: 08/11/2026 20:31
Changes: 08/11/2026 20:31 (56)
Complete: 🔍
Cache ID: 216::103

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