How severe is CVE-2016-2564?

CVE-2016-2564 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2016-2564 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-2564?

CVE-2016-2564 affects Invisioncommunity Invision Power Board. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2016-2564?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2016-2564 published?

CVE-2016-2564 was published on 2017-04-23 and last updated on 2026-06-17.

CVE-2016-2564

CVE-2016-2564 is a medium-severity vulnerability in Invisioncommunity Invision Power Board with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-331.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
CVSS v2: 4.3
EPSS exploit prediction: 1% (66th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-331
Affected product: Invisioncommunity Invision Power Board
Published: 2017-04-23
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2016-2564?: 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.
How severe is CVE-2016-2564?: CVE-2016-2564 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2016-2564 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-2564?: CVE-2016-2564 affects Invisioncommunity Invision Power Board. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2016-2564?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2016-2564 published?: CVE-2016-2564 was published on 2017-04-23 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:invisioncommunity:invision_power_board:*:*:*:*:*:*:*:*

More vulnerabilities in Invisioncommunity Invision Power Board

CVE-2012-5692 — Critical (CVSS 10.0): Unspecified vulnerability in admin/sources/base/core.php in Invision Power Board (aka IPB or IP.Board) 3.1.x through…
CVE-2013-3725 — Critical (CVSS 9.8): Invision Power Board (IPB) through 3.x allows admin account takeover leading to code execution.
CVE-2012-2226 — Critical (CVSS 9.8): Invision Power Board before 3.3.1 fails to sanitize user-supplied input which could allow remote attackers to obtain…
CVE-2017-8898 — Critical (CVSS 9.8): Invision Power Services (IPS) Community Suite 4.1.19.2 and earlier has stored XSS in the Announcements, allowing…
CVE-2014-4928 — High (CVSS 8.8): SQL injection vulnerability in Invision Power Board (aka IPB or IP.Board) before 3.4.6 allows remote attackers to…
CVE-2017-8899 — High (CVSS 8.1): Invision Power Services (IPS) Community Suite 4.1.19.2 and earlier has a composite of Stored XSS and Information…

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