Skip to content

Interception of invitations using users with email like usernames

High
stsewd published GHSA-4392-6mf4-pf5p Jun 10, 2026

Package

Read the Docs (Python)

Affected versions

<2026.06.16

Patched versions

2026.06.16

Description

Impact

This vulnerability could have allowed a user to intercept an invitation that was meant for another user. This was possible by registering an account with a username matching the email of the user to be invited.

Users of https://app.readthedocs.org/ and https://app.readthedocs.com/ do not need to take any further action, we have taken measures to ensure that the security issue is now fully fixed. This issue was discovered by a member of our team, and we have seen no signs that this vulnerability was abused in the wild.

Custom installations

We don't officially support custom installations of Read the Docs, but If you are using a custom installation, we recommend you to upgrade.

References

For more information

If you have any questions or comments about this advisory, email us at security@readthedocs.org (PGP)

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
Low

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L

CVE ID

No known CVE

Weaknesses

Improper Authorization

The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. Learn more on MITRE.

Credits