Security incident · CVE-2023-53891
Blackcat CMS 1.4 contains a stored cross-site scripting vulnerability that allows authenticated users to inject malicious scripts into page content.
Published Dec 15, 2025 · catalog updated Apr 7, 2026 · Blackcat CMS
Last checked Nov 4, 2026. A connected source was read within the last 7 days.
Check if you run it
No confirmed exploitation is on record for CVE-2023-53891. EPSS is 0.24%. Act only if a listed version of Blackcat CMS is installed.
Gaps on this record
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
Same product and reporting
- CVE-2023-53892 · High
- Severity
- Medium5.1
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.24%
- Remediation
- Vendor / distro source
- Affected products
- vendor blackcat-cms Blackcat CMS 1.4
Blackcat CMS 1.4 contains a stored cross-site scripting vulnerability that allows authenticated users to inject malicious scripts into page content. Attackers can insert JavaScript payloads in the page modification interface that execute when other users view the compromised page.
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 blackcat-cms Blackcat CMS 1.41.4
How to fix CVE-2023-53891
No stored fix
No vendor fix text is stored. Use the linked advisory before you change production.
Version check
Seen in 1.4
Advisory
Open the cve_org record and follow its fix.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2023-53891. EPSS is 0.24%. Act only if a listed version of Blackcat CMS is installed.
Which versions are affected?
Compare what you have installed with blackcat-cms Blackcat CMS 1.4 1.4. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
No weakness class is stored. EPSS 0.24%. 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.
Dec 15, 2025 · EUVD
Detected
Blackcat CMS 1.4 contains a stored cross-site scripting vulnerability that allows authenticated users to inject malicious scripts into page content. Attackers can insert JavaScript payloads in the page modification interface that execute when other users view the compromised page.
Apr 7, 2026 · EUVD
Updated
Blackcat CMS 1.4 contains a stored cross-site scripting vulnerability that allows authenticated users to inject malicious scripts into page content. Attackers can insert JavaScript payloads in the page modification interface that execute when other users view the compromised page.
Sources
- CVE.orgVulnerability recordCVE-2023-53891
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2023-53891
30-day exploitation probability 0.24%
first.org - EUVDVulnerability recordEUVD-2025-203419
Blackcat CMS 1.4 contains a stored cross-site scripting vulnerability that allows authenticated users to inject malicious scripts into page content. Attackers can insert JavaScript payloads in the page modification interface that execute when other users view the compromised page
euvd.enisa.europa.eu
References
Freshness
Last verified in this catalog Nov 4, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.
- FIRST EPSSNov 4, 2026
- EUVDOct 30, 2026
- CVE.orgOct 27, 2026