CVE-2026-40487

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

0.22% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 12.9% of scored records. A rank, not a probability.

NVD base score

9.0 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Analyzed. NVD last modified this record on 2026-10-26.

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

2026-04-18 01:19Z6 MO AGO

Last updated

2026-04-20 15:25Z6 MO AGO

Reserved

2026-04-13

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

High (CVSS 8.9)

CNA CVSS vector

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

Weaknesses

• CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')Base
• CWE-345Insufficient Verification of Data AuthenticityClass
• CWE-434Unrestricted Upload of File with Dangerous TypeBase

Data version

5.2

Document digest

13fc5886cfd0713716db5225361a20acbdb1f5dbab3ebb6da5f51b4eded0299e

• github.comhttps://github.com/gitroomhq/postiz-app/security/advisories/GHSA-44wg-r34q-hvfxx_refsource_CONFIRM
• github.comhttps://github.com/gitroomhq/postiz-app/releases/tag/v2.21.6x_refsource_MISC