CVE-2026-84155
Session Token Remains Valid After Logout in Multi-Worker Deployments
Description
CodeChecker's web server fails to fully invalidate a session token on logout when the server runs with more than one API worker process (the default). Each worker process maintains its own in-memory session cache; logout only clears the cache of the single worker that handles the request (plus the shared database record). Other workers continue to honor the destroyed token from their stale in-memory copies until the session's lifetime expires. An attacker who has captured a valid token can therefore keep impersonating the user after the user has logged out.
INFO
Published Date :
Nov. 6, 2026, 11:17 a.m.
Last Modified :
Nov. 6, 2026, 11:17 a.m.
Remotely Exploit :
No
Source :
85b1779b-6ecd-4f52-bcc5-73eac4659dcf
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | MEDIUM | 85b1779b-6ecd-4f52-bcc5-73eac4659dcf | ||||
| CVSS 4.0 | MEDIUM | 85b1779b-6ecd-4f52-bcc5-73eac4659dcf |
Solution
- Update CodeChecker to the latest version.
- Configure session management for all worker processes.
- Clear all in-memory session caches on logout.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-84155.
| URL | Resource |
|---|---|
| https://github.com/Ericsson/codechecker/security/advisories/GHSA-r42x-9wgw-cqc2 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-84155 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-84155
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-84155 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-84155 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 85b1779b-6ecd-4f52-bcc5-73eac4659dcf
Nov. 06, 2026
Action Type Old Value New Value Added Description CodeChecker's web server fails to fully invalidate a session token on logout when the server runs with more than one API worker process (the default). Each worker process maintains its own in-memory session cache; logout only clears the cache of the single worker that handles the request (plus the shared database record). Other workers continue to honor the destroyed token from their stale in-memory copies until the session's lifetime expires. An attacker who has captured a valid token can therefore keep impersonating the user after the user has logged out. Added CVSS V4.0 AV:L/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-613 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/84xxx/CVE-2026-84155.json">CVE-2026-84155</a> Added Reference https://github.com/Ericsson/codechecker/security/advisories/GHSA-r42x-9wgw-cqc2