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CVE-2021-25977

20
FAUCET Score

CVE-2021-25977 is a stored Cross-Site Scripting (XSS) vulnerability affecting PiranhaCMS versions 7.0.0 through 9.1.1. A low-privileged attacker can exploit this by injecting malicious JavaScript into the page title field, which is not properly sanitized. This vulnerability has a CVSS score of 5.4 (Medium), indicating a low attack complexity and requiring user interaction, with potential impacts on confidentiality and integrity. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
>= 7.0.0, <= 9.1.1CPE matchmatch criteria
cpe:2.3:a:dotnetfoundation:piranha_cms:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.4MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.3
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.63%
Probability of exploitation in next 30 days
EPSS Percentile
46.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0063 is in the 78th percentile among its peer group of 15,225 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
nugetpatch availablevia ghsa
Product: PiranhaFixed in: 9.2.0

Vendor Advisories (1)

nugetGHSA-jvjp-vh27-r9h5medium

Cross-site Scripting in PiranhaCMS

Oct 27, 2021

References

github.com / PiranhaCMS/piranha.core/commit/543bc53c7dbd28c793ec960b57fb0e716c6b18d7
PatchThird Party Advisory
whitesourcesoftware.com / vulnerability-database/CVE-2021-25977
Third Party Advisory