How severe is CVE-2021-39250?

CVE-2021-39250 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-39250 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-39250?

CVE-2021-39250 affects Invisioncommunity Invision Power Board. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-39250?

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

When was CVE-2021-39250 published?

CVE-2021-39250 was published on 2021-08-17 and last updated on 2026-06-17.

CVE-2021-39250

CVE-2021-39250 is a medium-severity vulnerability in Invisioncommunity Invision Power Board with a CVSS 3.x base score of 5.4. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v2: 3.5
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Invisioncommunity Invision Power Board
Published: 2021-08-17
Last modified: 2026-06-17

Description

Invision Community (aka IPS Community Suite or IP-Board) before 4.6.5.1 allows stored XSS, with resultant code execution, because an uploaded file can be placed in an IFRAME element within user-generated content. For code execution, the attacker can rely on the ability of an admin to install widgets, disclosure of the admin session ID in a Referer header, and the ability of an admin to use the templating engine (e.g., Edit HTML).

Frequently asked questions

What is CVE-2021-39250?: Invision Community (aka IPS Community Suite or IP-Board) before 4.6.5.1 allows stored XSS, with resultant code execution, because an uploaded file can be placed in an IFRAME element within user-generated content. For code execution, the attacker can rely on the ability of an admin to install widgets, disclosure of the admin session ID in a Referer header, and the ability of an admin to use the templating engine (e.g., Edit HTML).
How severe is CVE-2021-39250?: CVE-2021-39250 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-39250 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-39250?: CVE-2021-39250 affects Invisioncommunity Invision Power Board. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-39250?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-39250 published?: CVE-2021-39250 was published on 2021-08-17 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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