Session tokens are not invalidated on logout in heroiclabs/nakama


Reported on

May 24th 2022


The session cookie is not invalidated on logout so, it can be used after logout as well.

Proof of Concept

Login to the Nakama console.
Intercept the request. Below is a sample request:

GET /v2/console/user HTTP/1.1
Host: localhost:7351
Accept: application/json, text/plain, */*
Authorization: Bearer <token>
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.74 Safari/537.36
Referer: http://localhost:7351/
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9
Connection: close

Logout from the application.
Replay the request. Response is received as an authorized user.


Old session tokens can be used to authenticate to the application and send authenticated requests.

We are processing your report and will contact the heroiclabs/nakama team within 24 hours. 2 months ago
We have contacted a member of the heroiclabs/nakama team and are waiting to hear back 2 months ago
We have sent a follow up to the heroiclabs/nakama team. We will try again in 7 days. 2 months ago
nerrorsec modified the report
2 months ago
nerrorsec modified the report
2 months ago
heroiclabs/nakama maintainer has acknowledged this report 2 months ago
Andrei Mihu
2 months ago


Thanks for the report, we're looking into this and will respond in more depth as soon as possible.

Andrei Mihu validated this vulnerability a month ago
nerrorsec has been awarded the disclosure bounty
The fix bounty is now up for grabs
The researcher's credibility has increased: +7
Andrei Mihu confirmed that a fix has been merged on ce8d39 a month ago
The fix bounty has been dropped
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