What is CVE-2023-5838?

CVE-2023-5838 is a critical-severity vulnerability in Linkstack, classified under Insufficient Session Expiration. CVSS score: 9.8/10. Published 2023-10-29.

How severe is CVE-2023-5838?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2023-5838 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Linkstack

CVE-2023-5838

Insufficient Session Expiration in GitHub repository linkstackorg/linkstack prior to v4.2.9.

Published 2023-10-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.005 (40.8th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 40.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Linkstack
Linkstackorg Linkstackorg/linkstack — versions unspecified

Weakness classification (CWE)

CWE-613 — Insufficient Session Expiration

Public proof-of-concept exploits

sev-hack/sev-hack

References

huntr.com/bounties/8f6feca3-386d-4897-801c-39b9e3e5eb03 (Exploit, Patch, Third Party Advisory)
github.com/linkstackorg/linkstack/commit/02f620092255f07e1d0252a0190fd42ef773ba… (Patch)

Frequently asked questions

What is CVE-2023-5838?: CVE-2023-5838 is a critical-severity vulnerability in Linkstack, classified under Insufficient Session Expiration. CVSS score: 9.8/10. Published 2023-10-29.
How severe is CVE-2023-5838?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2023-5838 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.