Chocobozzz PeerTube up to 8.2.1 Video Watch Page Renderer schema.org JSON.stringify Value injection

Summaryinfo

A vulnerability was found in Chocobozzz PeerTube up to 8.2.1. It has been classified as critical. Affected is the function JSON.stringify of the file schema.org of the component Video Watch Page Renderer. The manipulation of the argument Value leads to injection. This vulnerability is referenced as CVE-2026-57167. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in Chocobozzz PeerTube up to 8.2.1. It has been rated as critical. This issue affects the function JSON.stringify of the file schema.org of the component Video Watch Page Renderer. The manipulation of the argument value with an unknown input leads to a injection vulnerability. Using CWE to declare the problem leads to CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

PeerTube is an ActivityPub-federated video streaming platform. Prior to 8.2.2, server-side-rendered video watch pages embed a schema.org JSON-LD block by JSON.stringify-ing video metadata without escaping less-than, greater-than, or slash characters, allowing a value containing the byte sequence that closes a script element to inject arbitrary HTML or JavaScript that executes in the instance origin for visitors to the attacker's videos. This issue is fixed in version 8.2.2.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-57167 since 06/24/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1055 for this issue.

Upgrading to version 8.2.2 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• Chocobozzz

Name

• PeerTube

Version

• 8.2.0
• 8.2.1

Website

• Product: https://github.com/Chocobozzz/PeerTube/

CPE 2.3info

• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion