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Vulnerabilities

Vulnerability · CVE-2025-26951

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in covertnine C9 Blocks c9-blocks allows DOM-Based XSS.This issue affects C9 Bloc

Published Apr 15, 2025 · catalog updated Apr 28, 2026 · C9 Blocks

Check this week

CVE-2025-26951 is not in CISA KEV. FIRST estimates a 27.00% chance of exploitation in the next 30 days. Check whether you run C9 Blocks.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
27.00%
Remediation
Advisory link
Affected products
vendor covertnine C9 Blocks 0 ≤1.7.7

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in covertnine C9 Blocks c9-blocks allows DOM-Based XSS.This issue affects C9 Blocks: from n/a through <= 1.7.7.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor covertnine C9 Blocks 0 ≤1.7.70 ≤1.7.7

How to fix CVE-2025-26951

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2025-26951 is not in CISA KEV. FIRST estimates a 27.00% chance of exploitation in the next 30 days. Check whether you run C9 Blocks.

Which versions are affected?

Compare what you have installed with covertnine C9 Blocks 0 ≤1.7.7 0 ≤1.7.7. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 27.00%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 15, 2025 · EUVD

    Detected

    Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in covertnine C9 Blocks c9-blocks allows DOM-Based XSS.This issue affects C9 Blocks: from n/a through <= 1.7.7.

  2. Apr 28, 2026 · EUVD

    Updated

    Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in covertnine C9 Blocks c9-blocks allows DOM-Based XSS.This issue affects C9 Blocks: from n/a through <= 1.7.7.

Sources

  • CVE.orgVulnerability recordCVE-2025-26951

    Official CVE identifier

    cve.org
  • EUVDVulnerability recordEUVD-2025-11113

    Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in covertnine C9 Blocks c9-blocks allows DOM-Based XSS.This issue affects C9 Blocks: from n/a through <= 1.7.7.

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.