OpenReplay up to 1.26.x Session Access Validation getFirstMob path authentication replay

Summaryinfo

A vulnerability described as critical has been identified in OpenReplay up to 1.26.x. The impacted element is the function getFirstMob of the component Session Access Validation. Such manipulation of the argument path leads to authentication replay. This vulnerability is listed as CVE-2026-55881. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in OpenReplay up to 1.26.x. It has been rated as critical. Affected by this issue is the function getFirstMob of the component Session Access Validation. The manipulation of the argument path with an unknown input leads to a authentication replay vulnerability. Using CWE to declare the problem leads to CWE-294. A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes). Impacted is confidentiality, integrity, and availability. CVE summarizes:

OpenReplay is a self-hosted session replay suite. From 1.22.0 before 1.27.0, getFirstMob returned 15-second presigned S3 download URLs for a session's DOM-replay recording based solely on the session path parameter, while validateProjectAccess checked only that the project belonged to the requester's tenant and did not verify that the session belonged to that project, allowing any authenticated low-privilege user to read another tenant's first 15 seconds of session-replay recording data. This issue is fixed in version 1.27.0.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-55881 since 06/17/2026. 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 T1040.

Upgrading to version 1.27.0 eliminates this vulnerability.

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Productinfo

Name

• OpenReplay

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20
• 1.21
• 1.22
• 1.23
• 1.24
• 1.25
• 1.26

Website

• Product: https://github.com/openreplay/openreplay/

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