CVE-2026-27760

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

34.63% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 98.3% of scored records. A rank, not a probability.

NVD base score

9.2 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Deferred. NVD last modified this record on 2026-07-14.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-04-28 13:43Z4 MO AGO

Last updated

2026-07-14 18:39Z1 MO AGO

Reserved

2026-02-23

Assigning CNA

VulnCheck

Record state

PUBLISHED

Severity

Critical (CVSS 9.2)

CNA CVSS vector

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Weaknesses

• CWE-94Improper Control of Generation of Code ('Code Injection')Base

Data version

5.2

Document digest

3367fa5b4c29bfb6365768ffd668117b070dc59ada074022f799095e363ad0dd

• chocapikk.comhttps://chocapikk.com/posts/2026/opencats-installer-rce/technical-descriptionexploit
• github.comhttps://github.com/opencats/OpenCATS/pull/706issue-tracking
• github.comhttps://github.com/opencats/OpenCATS/commit/3002a29f4c3cada1aa2c4f3d4ae4e189906606b6patch
• github.comhttps://github.com/opencats/OpenCATS/blob/46e4727/lib/CATSUtility.php#L142-L172related
• github.comhttps://github.com/opencats/OpenCATS/blob/46e4727/modules/install/ajax/ui.php#L130related
• www.vulncheck.comhttps://www.vulncheck.com/advisories/opencats-php-code-injection-via-installer-ajax-endpointthird-party-advisory