Invision Power Services (IPS) Community Suite before 4.1.9 makes session hijack easier by relying on the PHP uniqid function without the more_entropy flag. Attackers can guess an Invision Power Board session cookie if they can predict the exact time of cookie generation.
CVE-2016-2564
MEDIUMNVD 5.95.9—
EchelonGraph scoreMEDIUM confidence
Score 5.9 from GitHub Security Advisory published 2022-05-13. NVD baseline CVSS 5.9; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.9
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 1%CVSS: 5.9Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 5.9
- EG Score
- 5.9(medium)
- EPSS
- 66.4%
- KEV
- Not listed
Published
April 23, 2017
Last Modified
May 13, 2026
References (4)
- cve@mitrehttps://invisionpower.com/release-notes/419-r37/
- cve@mitrehttps://medium.com/%40iancarroll/bypassing-authentication-in-invision-power-board-with-cve-2016-2564-9a24ea3655f9
- af854a3a-2127-422b-91ae-364da2661108https://invisionpower.com/release-notes/419-r37/
- af854a3a-2127-422b-91ae-364da2661108https://medium.com/%40iancarroll/bypassing-authentication-in-invision-power-board-with-cve-2016-2564-9a24ea3655f9
Frequently asked(5)
What is CVE-2016-2564?
CVE-2016-2564 is a medium vulnerability published on April 23, 2017. Invision Power Services (IPS) Community Suite before 4.1.9 makes session hijack easier by relying on the PHP uniqid function without the more_entropy flag. Attackers can guess an Invision Power Board session cookie if they can predict the exact time of cookie generation.
When was CVE-2016-2564 disclosed?
CVE-2016-2564 was first published in the National Vulnerability Database on April 23, 2017, with the most recent update on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2016-2564 actively exploited?
CVE-2016-2564 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 66.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2016-2564?
CVE-2016-2564 has a CVSS v3 base score of 5.9 (NVD).
How do I remediate CVE-2016-2564?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-2564, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2016-2564
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