How severe is CVE-2021-25976?

CVE-2021-25976 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability high.

Is CVE-2021-25976 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-25976?

CVE-2021-25976 primarily affects Dotnetfoundation Piranha Cms. In total, 12 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-25976?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-25976 published?

CVE-2021-25976 was published on 2021-11-16 and last updated on 2026-06-17.

CVE-2021-25976

CVE-2021-25976 is a high-severity vulnerability in Dotnetfoundation Piranha Cms with a CVSS 3.x base score of 8.1. 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-352.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v2: 4.0
EPSS exploit prediction: 0% (35th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-352
Affected product: Dotnetfoundation Piranha Cms
Published: 2021-11-16
Last modified: 2026-06-17

Description

In PiranhaCMS, versions 4.0.0-alpha1 to 9.2.0 are vulnerable to cross-site request forgery (CSRF) when performing various actions supported by the management system, such as deleting a user, deleting a role, editing a post, deleting a media folder etc., when an ID is known.

Frequently asked questions

What is CVE-2021-25976?: In PiranhaCMS, versions 4.0.0-alpha1 to 9.2.0 are vulnerable to cross-site request forgery (CSRF) when performing various actions supported by the management system, such as deleting a user, deleting a role, editing a post, deleting a media folder etc., when an ID is known.
How severe is CVE-2021-25976?: CVE-2021-25976 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability high.
Is CVE-2021-25976 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-25976?: CVE-2021-25976 primarily affects Dotnetfoundation Piranha Cms. In total, 12 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-25976?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-25976 published?: CVE-2021-25976 was published on 2021-11-16 and last updated on 2026-06-17.

References

Affected products (12)

cpe:2.3:a:dotnetfoundation:piranha_cms:*:*:*:*:*:*:*:*
cpe:2.3:a:dotnetfoundation:piranha_cms:4.0.0:-:*:*:*:*:*:*
cpe:2.3:a:dotnetfoundation:piranha_cms:4.0.0:alpha1:*:*:*:*:*:*
cpe:2.3:a:dotnetfoundation:piranha_cms:4.0.0:alpha3:*:*:*:*:*:*
cpe:2.3:a:dotnetfoundation:piranha_cms:4.0.0:alpha4:*:*:*:*:*:*
cpe:2.3:a:dotnetfoundation:piranha_cms:4.0.0:alpha5:*:*:*:*:*:*
cpe:2.3:a:dotnetfoundation:piranha_cms:4.0.0:alpha6:*:*:*:*:*:*
cpe:2.3:a:dotnetfoundation:piranha_cms:4.0.0:alpha7:*:*:*:*:*:*
cpe:2.3:a:dotnetfoundation:piranha_cms:4.0.0:alpha8:*:*:*:*:*:*
cpe:2.3:a:dotnetfoundation:piranha_cms:4.0.0:alpha9:*:*:*:*:*:*
cpe:2.3:a:dotnetfoundation:piranha_cms:4.0.0:beta1:*:*:*:*:*:*
cpe:2.3:a:dotnetfoundation:piranha_cms:4.0.0:rc1:*:*:*:*:*:*

More vulnerabilities in Dotnetfoundation Piranha Cms

CVE-2025-57692 — Medium (CVSS 6.8): PiranhaCMS 12.0 allows stored XSS in the Text content block of Standard and Standard Archive Pages via /manager/pages,…
CVE-2025-67291 — Medium (CVSS 6.1): A stored cross-site scripting (XSS) vulnerability in the Media module of Piranha CMS v12.1 allows attackers to execute…
CVE-2025-67290 — Medium (CVSS 6.1): A stored cross-site scripting (XSS) vulnerability in the Page Settings module of Piranha CMS v12.1 allows attackers to…
CVE-2025-61413 — Medium (CVSS 6.1): A stored cross-site scripting (XSS) vulnerability in the /manager/pages component of Piranha CMS v12.0 allows attackers…
CVE-2021-25977 — Medium (CVSS 5.4): In PiranhaCMS, versions 7.0.0 to 9.1.1 are vulnerable to stored XSS due to the page title improperly sanitized. By…
CVE-2024-55341 — Medium (CVSS 4.7): A stored cross-site scripting (XSS) vulnerability in Piranha CMS 11.1 allows remote attackers to execute arbitrary…

All CVEs affecting Dotnetfoundation Piranha Cms →

Other CWE-352 (Cross-Site Request Forgery (CSRF)) vulnerabilities

CVE-2025-32642 — Critical (CVSS 10.0): Cross-Site Request Forgery (CSRF) vulnerability in appsbd Vite Coupon vite-coupon allows Remote Code Inclusion.This…
CVE-2025-23922 — Critical (CVSS 10.0): Cross-Site Request Forgery (CSRF) vulnerability in Harsh iSpring Embedder embed-ispring allows Upload a Web Shell to a…
CVE-2017-5145 — Critical (CVSS 10.0): An issue was discovered in Carlo Gavazzi VMU-C EM prior to firmware Version A11_U05, and VMU-C PV prior to firmware…
CVE-2019-25729 — Critical (CVSS 9.8): PDF Signer 3.0 contains a server-side template injection vulnerability that allows unauthenticated attackers to execute…
CVE-2025-48340 — Critical (CVSS 9.8): Cross-Site Request Forgery (CSRF) vulnerability in Danny Vink User Profile Meta Manager user-profile-meta allows…
CVE-2025-2907 — Critical (CVSS 9.8): The Order Delivery Date WordPress plugin before 12.3.1 does not have authorization and CSRF checks when importing…

Browse all CWE-352 (Cross-Site Request Forgery (CSRF)) vulnerabilities →