CVE-2021-25977

Name: CVE-2021-25977
Creator: NVD / NIST
Published: 2021-10-25T13:15:07.8+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.63%

Last modified Jun 17, 2026

CVE-2021-25977 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. In PiranhaCMS, versions 7.0.0 to 9.1.1 are vulnerable to stored XSS due to the page title improperly sanitized. By creating a page with a specially crafted page title, a low privileged user can trigger arbitrary JavaScript execution.. EPSS estimates a 0.63% chance of exploitation in the next 30 days.

Description

In PiranhaCMS, versions 7.0.0 to 9.1.1 are vulnerable to stored XSS due to the page title improperly sanitized. By creating a page with a specially crafted page title, a low privileged user can trigger arbitrary JavaScript execution.

Metrics

CVSS 3.1

5.4/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

0.63%

45.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Dotnetfoundation	Piranha Cms	>= 7.0.0, <= 9.1.1

References

https://github.com/PiranhaCMS/piranha.core/commit/543bc53c7dbd28c793ec960b57fb0e716c6b18d7Patch, Third Party Advisory
https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25977Third Party Advisory
https://github.com/PiranhaCMS/piranha.core/commit/543bc53c7dbd28c793ec960b57fb0e716c6b18d7Patch, Third Party Advisory
https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25977Third Party Advisory

Timeline

Published: Oct 25, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-25977?

How severe is CVE-2021-25977?

CVE-2021-25977 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.63% probability of exploitation in the next 30 days.

How do I fix CVE-2021-25977?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-25977?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST